The ligand binding domain of the retinoid X receptor and Ultraspiracle, members of nuclear receptor superfamily; The ligand binding domain of the retinoid X receptor (RXR) and Ultraspiracle (USP): This family includes two evolutionary related nuclear receptors: retinoid X receptor (RXR) and Ultraspiracle (USP). RXR is a nuclear receptor in mammalian and USP is its counterpart in invertebrates. The native ligand of retinoid X receptor is 9-cis retinoic acid (RA). RXR functions as a DNA binding partner by forming heterodimers with other nuclear receptors including CAR, FXR, LXR, PPAR, PXR, RAR, TR, and VDR. RXRs can play different roles in these heterodimers. It acts either as a structural component of the heterodimer complex, required for DNA binding but not acting as a receptor or as both a structural and a functional component of the heterodimer, allowing 9-cis RA to signal through the corresponding heterodimer. In addition, RXR can also form homodimers, functioning as a receptor for 9-cis RA, independently of other nuclear receptors. Ultraspiracle (USP) plays similar roles as DNA binding partner of other nuclear rec eptors in invertebrates. USP has no known high-affinity ligand and is thought to be a silent component in the heterodimeric complex with partner receptors. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, RXR and USP have a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 218 EMPVEKILEAEMAVEQKTElhaDGSSGGSSPNDPVTNICQAADKQLFTLVEWAKRIPHFSELSLDDQVILLRAGWNELLI 297
Cdd:cd06943    1 DMPIERILEAELAVEPKSE---AVAMVPPEYRDPVSNICQAADKQLFQLVEWAKRIPHFSELPLDDQVILLRAGWNELLI 77

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 298 ASFSHRSITVKDGILLATGLHVHRNSAHSAGVGAIFDRVLTELVSKMRDMQMDKTELGCLRAIILFNPDAKGLSSPSEVE 377
Cdd:cd06943   78 AAFAHRSIAVKDGILLATGLHLHRNSAHQAGVGAIFDRILTELVVKMRDLKMDRTELGCLRAIILFNPDVKGLKSRQEVE 157

                        170       180       190       200       210
                 ....*....|....*....|....*....|....*....|....*....|
gi 528509165 378 LLREKVYASLEAYCKQRYPDQQGRFAKLLLRLPALRSIGLKCLEHLFFFK 427
Cdd:cd06943  158 SLREKVYASLEEYCRQKHPEQPGRFAKLLLRLPALRSIGLKCLEHLFFFK 207

Nuclear/hormone receptor activator site AF-1; Nuclear receptors (NRs) are a family of ligand-inducible transcription factors, and, like other transcription factors, they contain a distinct DNA binding domain that allows for target gene recognition and several activation domains that possess the ability to activate transcription. One of these activation domains is at the N-terminal, although there are two distinct motifs within this domain, between residues 20-36 and between 74 and the end of this domain, which are the binding regions. One of the co-activators is TIF1beta, which appears to bind at the first motif.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165   25 PPLAPSAAAMTSLPPITSAVNSPISSMGSPFSVISSSLGSP--CLPGTPSVGYGPISSPQINStvsmsgLHAVSSSDDVK 102
Cdd:pfam11825  19 PSYISASGSSRSLHSPMSTLGSPMNGLGSPYSVITSSMGPHslSLPSTPGMNFGTLNSPQLNS------MNSVSSSEDIK 92

                          90       100
                  ....*....|....*....|.
gi 528509165  103 PPFGLKPL-----SSHSPGPM 118
Cdd:pfam11825  93 PPPGLNGVgnmnyPATSPGSL 113

The ligand binding domain of the retinoid X receptor and Ultraspiracle, members of nuclear receptor superfamily; The ligand binding domain of the retinoid X receptor (RXR) and Ultraspiracle (USP): This family includes two evolutionary related nuclear receptors: retinoid X receptor (RXR) and Ultraspiracle (USP). RXR is a nuclear receptor in mammalian and USP is its counterpart in invertebrates. The native ligand of retinoid X receptor is 9-cis retinoic acid (RA). RXR functions as a DNA binding partner by forming heterodimers with other nuclear receptors including CAR, FXR, LXR, PPAR, PXR, RAR, TR, and VDR. RXRs can play different roles in these heterodimers. It acts either as a structural component of the heterodimer complex, required for DNA binding but not acting as a receptor or as both a structural and a functional component of the heterodimer, allowing 9-cis RA to signal through the corresponding heterodimer. In addition, RXR can also form homodimers, functioning as a receptor for 9-cis RA, independently of other nuclear receptors. Ultraspiracle (USP) plays similar roles as DNA binding partner of other nuclear rec eptors in invertebrates. USP has no known high-affinity ligand and is thought to be a silent component in the heterodimeric complex with partner receptors. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, RXR and USP have a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 218 EMPVEKILEAEMAVEQKTElhaDGSSGGSSPNDPVTNICQAADKQLFTLVEWAKRIPHFSELSLDDQVILLRAGWNELLI 297
Cdd:cd06943    1 DMPIERILEAELAVEPKSE---AVAMVPPEYRDPVSNICQAADKQLFQLVEWAKRIPHFSELPLDDQVILLRAGWNELLI 77

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 298 ASFSHRSITVKDGILLATGLHVHRNSAHSAGVGAIFDRVLTELVSKMRDMQMDKTELGCLRAIILFNPDAKGLSSPSEVE 377
Cdd:cd06943   78 AAFAHRSIAVKDGILLATGLHLHRNSAHQAGVGAIFDRILTELVVKMRDLKMDRTELGCLRAIILFNPDVKGLKSRQEVE 157

                        170       180       190       200       210
                 ....*....|....*....|....*....|....*....|....*....|
gi 528509165 378 LLREKVYASLEAYCKQRYPDQQGRFAKLLLRLPALRSIGLKCLEHLFFFK 427
Cdd:cd06943  158 SLREKVYASLEEYCRQKHPEQPGRFAKLLLRLPALRSIGLKCLEHLFFFK 207

Ligand binding domain of hormone receptors;

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165   259 ADKQLFTLVEWAKRIPHFSELSLDDQVILLRAGWNELLIASFSHRSITVKDGILLATGLHVHRNSAHS---AGVGAIFDR 335
Cdd:smart00430   1 AERQLLLTVEWAKSFPGFRELSLEDQIVLLKSFWFELLLLELAYRSVKLKKELLLAPDGTYIRPDAVLelrKLFSPFLDR 80

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165   336 VLTELVSKMRDMQMDKTELGCLRAIILFNPDAKGLSSPS--EVELLREKVYASLEAYCKQRYPDQQ-GRFAKLLLRLPAL 412
Cdd:smart00430  81 ILSELVKPLRELKLDDEEYALLKAIVLFNPAVPGLSEEGkeIVEKLQEKYANALHDYYLKNYPMNYpGRFAKLLLILPEL 160

                   ...
gi 528509165   413 RSI 415
Cdd:smart00430 161 RKI 163

c4 zinc finger in nuclear hormone receptors;

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165   124 LCAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDLSYTCRDNKDCLVDKRQRNRCQYCRYQKCLAMGMKRE 193
Cdd:smart00399   1 LCCVCGDHASGFHFGVCSCRACKAFFRRTVNLRYKYRCDRKNNCSINKRYRCRCRACRLKKCLGVGMDPE 70

Nuclear/hormone receptor activator site AF-1; Nuclear receptors (NRs) are a family of ligand-inducible transcription factors, and, like other transcription factors, they contain a distinct DNA binding domain that allows for target gene recognition and several activation domains that possess the ability to activate transcription. One of these activation domains is at the N-terminal, although there are two distinct motifs within this domain, between residues 20-36 and between 74 and the end of this domain, which are the binding regions. One of the co-activators is TIF1beta, which appears to bind at the first motif.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165   25 PPLAPSAAAMTSLPPITSAVNSPISSMGSPFSVISSSLGSP--CLPGTPSVGYGPISSPQINStvsmsgLHAVSSSDDVK 102
Cdd:pfam11825  19 PSYISASGSSRSLHSPMSTLGSPMNGLGSPYSVITSSMGPHslSLPSTPGMNFGTLNSPQLNS------MNSVSSSEDIK 92

                          90       100
                  ....*....|....*....|.
gi 528509165  103 PPFGLKPL-----SSHSPGPM 118
Cdd:pfam11825  93 PPPGLNGVgnmnyPATSPGSL 113

The ligand binding domain of the retinoid X receptor and Ultraspiracle, members of nuclear receptor superfamily; The ligand binding domain of the retinoid X receptor (RXR) and Ultraspiracle (USP): This family includes two evolutionary related nuclear receptors: retinoid X receptor (RXR) and Ultraspiracle (USP). RXR is a nuclear receptor in mammalian and USP is its counterpart in invertebrates. The native ligand of retinoid X receptor is 9-cis retinoic acid (RA). RXR functions as a DNA binding partner by forming heterodimers with other nuclear receptors including CAR, FXR, LXR, PPAR, PXR, RAR, TR, and VDR. RXRs can play different roles in these heterodimers. It acts either as a structural component of the heterodimer complex, required for DNA binding but not acting as a receptor or as both a structural and a functional component of the heterodimer, allowing 9-cis RA to signal through the corresponding heterodimer. In addition, RXR can also form homodimers, functioning as a receptor for 9-cis RA, independently of other nuclear receptors. Ultraspiracle (USP) plays similar roles as DNA binding partner of other nuclear rec eptors in invertebrates. USP has no known high-affinity ligand and is thought to be a silent component in the heterodimeric complex with partner receptors. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, RXR and USP have a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 218 EMPVEKILEAEMAVEQKTElhaDGSSGGSSPNDPVTNICQAADKQLFTLVEWAKRIPHFSELSLDDQVILLRAGWNELLI 297
Cdd:cd06943    1 DMPIERILEAELAVEPKSE---AVAMVPPEYRDPVSNICQAADKQLFQLVEWAKRIPHFSELPLDDQVILLRAGWNELLI 77

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 298 ASFSHRSITVKDGILLATGLHVHRNSAHSAGVGAIFDRVLTELVSKMRDMQMDKTELGCLRAIILFNPDAKGLSSPSEVE 377
Cdd:cd06943   78 AAFAHRSIAVKDGILLATGLHLHRNSAHQAGVGAIFDRILTELVVKMRDLKMDRTELGCLRAIILFNPDVKGLKSRQEVE 157

                        170       180       190       200       210
                 ....*....|....*....|....*....|....*....|....*....|
gi 528509165 378 LLREKVYASLEAYCKQRYPDQQGRFAKLLLRLPALRSIGLKCLEHLFFFK 427
Cdd:cd06943  158 SLREKVYASLEEYCRQKHPEQPGRFAKLLLRLPALRSIGLKCLEHLFFFK 207

Ligand-binding domain of nuclear receptor family 2; Ligand-binding domain (LBD) of nuclear receptor (NR) family 2: This is one of the major subfamily of nuclear receptors, including some well known nuclear receptors such as glucocorticoid receptor (GR), mineralocorticoid receptor (MR), estrogen receptor (ER), progesterone receptor (PR), and androgen receptor (AR), other related receptors. Nuclear receptors form a superfamily of ligand-activated transcription regulators, which regulate various physiological functions, from development, reproduction, to homeostasis and metabolism in animals (metazoans). The family contains not only receptors for known ligands but also orphan receptors for which ligands do not exist or have not been identified. NRs share a common structural organization with a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a non-conserved hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 252 VTNICQAADKQLFTLVEWAKRIPHFSELSLDDQVILLRAGWNELLIASFSHRSIT--VKDGILLATGLHVHRNSAHSAGV 329
Cdd:cd06930    1 PESLCELADRVLFKTVDWAKNLPAFRNLPLDDQLTLLQNSWAELLLLGLAQRSVHfeLSELLLPSPLLVILTEREALLGL 80

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 330 GAIFDRvLTELVSKMRDMQMDKTELGCLRAIILFNPDAKGLSSPSEVELLREKVYASLEAYCKQRYPDQQGRFAKLLLRL 409
Cdd:cd06930   81 AELVQR-LQELLSKLRSLQLDPKEYACLKAIVLFNPDLPGLKNQQQVEELQEKAQQALQEYIRKRYPQQPARFAKLLLRL 159

                 ....*.
gi 528509165 410 PALRSI 415
Cdd:cd06930  160 PELRSI 165

DNA-binding domain of retinoid X receptor (RXR) is composed of two C4-type zinc fingers; DNA-binding domain of retinoid X receptor (RXR) is composed of two C4-type zinc fingers. Each zinc finger contains a group of four Cys residues which co-ordinates a single zinc atom. RXR functions as a DNA binding partner by forming heterodimers with other nuclear receptors including CAR, FXR, LXR, PPAR, PXR, RAR, TR, and VDR. All RXR heterodimers preferentially bind response elements composed of direct repeats of two AGGTCA sites with a 1-5 bp spacer. RXRs can play different roles in these heterodimers. RXR acts either as a structural component of the heterodimer complex, required for DNA binding but not acting as a receptor, or as both a structural and a functional component of the heterodimer, allowing 9-cis RA to signal through the corresponding heterodimer. In addition, RXR can also form homodimers, functioning as a receptor for 9-cis RA, independently of other nuclear receptors. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, RXR has a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 528509165 124 LCAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDLSYTCRDNKDCLVDKRQRNRCQYCRYQKCLAMGMKREAVQEER 199
Cdd:cd06956    2 ICAICGDRASGKHYGVYSCEGCKGFFKRTVRKDLTYTCRDNKDCLIDKRQRNRCQYCRYQKCLAMGMKREAVQEER 77

DNA-binding domain of nuclear receptors is composed of two C4-type zinc fingers; DNA-binding domain of nuclear receptors is composed of two C4-type zinc fingers. Each zinc finger contains a group of four Cys residues which co-ordinates a single zinc atom. It interacts with a specific DNA site upstream of the target gene and modulates the rate of transcriptional initiation. Nuclear receptors form a superfamily of ligand-activated transcription regulators, which regulate various physiological functions, from development, reproduction, to homeostasis and metabolism in animals (metazoans). The family contains not only receptors for known ligands but also orphan receptors for which ligands do not exist or have not been identified. NRs share a common structural organization with a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD). Most nuclear receptors bind as homodimers or heterodimers to their target sites, which consist of two hexameric half-sites. Specificity is determined by the half-site sequence, the relative orientation of the half-sites and the number of spacer nucleotides between the half-sites. However, a growing number of nuclear receptors have been reported to bind to DNA as monomers.

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|..
gi 528509165 125 CAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDLSYTCRDNKDCLVDKRQRNRCQYCRYQKCLAMGMKREAVQ 196
Cdd:cd06916    1 CAVCGDKASGYHYGVLTCEGCKGFFRRSVRRNLEYTCPAGGNCVIDKRNRNRCQACRLKKCLAVGMRKEAVR 72

The ligand binding domain of nuclear receptors, a family of ligand-activated transcription regulators; Ligand-binding domain (LBD) of nuclear receptor (NR): Nuclear receptors form a superfamily of ligand-activated transcription regulators, which regulate various physiological functions in metazoans, from development, reproduction, to homeostasis and metabolism. The superfamily contains not only receptors for known ligands but also orphan receptors for which ligands do not exist or have not been identified. The members of the family include receptors of steroids, thyroid hormone, retinoids, cholesterol by-products, lipids and heme. With few exceptions, NRs share a common structural organization with a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a non-conserved hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 253 TNICQAADKQLFTLVEWAKRIPHFSELSLDDQVILLRAGWNELLIASFSHRSITVKDGILLATGLH----VHRNSAHSAG 328
Cdd:cd06157    1 ELLCELATRDLLLIVEWAKSIPGFRELPLEDQIVLLKSFWLELLVLDLAYRSYKNGLSLLLAPNGGhtddDKEDEMKLLL 80

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 329 VGaIFDRVLTELVSKMRDMQMDKTELGCLRAIILFNPDAK-GLSSPSEVELLREKVYASLEAYCKQRYP-DQQGRFAKLL 406
Cdd:cd06157   81 KG-ELIRLLFEFVNPLRALKLDDEEYALLKAIVLFSPDRKeSLEDRKIVEELQERLLEALQDYLRKNYPeEAPSRFAKLL 159

                 ....*....
gi 528509165 407 LRLPALRSI 415
Cdd:cd06157  160 LLLPSLRKL 168

The ligand binding domain of the liver receptor homolog-1, a member of nuclear receptor superfamily,; The ligand binding domain (LBD) of the liver receptor homolog-1 (LRH-1): LRH-1 belongs to nuclear hormone receptor superfamily, and is expressed mainly in the liver, intestine, exocrine pancreas, and ovary. Most nuclear receptors function as homodimer or heterodimers. However, LRH-1 binds DNA as a monomer, and is a regulator of bile-acid homeostasis, steroidogenesis, reverse cholesterol transport and the initial stages of embryonic development. Recently, phospholipids have been identified as potential ligand for LRH-1 and steroidogenic factor-1 (SF-1). Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, LRH-1 has a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 255 ICQAADKQLFTLVEWAKRIPHFSELSLDDQVILLRAGWNELLIASFSHRSIT-VKDG-ILLATGLHVHRnSAHSAGVGAI 332
Cdd:cd07069   45 MCKMADQTLFSIVEWARSSIFFRELKVDDQMKLLQNCWSELLILDHIYRQVVhGKEGsIFLVTGQQVDY-SIIASQAGAT 123

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 333 FDRVLT---ELVSKMRDMQMDKTELGCLRAIILFNPDAKGLSSPSEVELLREKVYASLEAYCKQRYPDQQGRFAKLLLRL 409
Cdd:cd07069  124 LNNLMShaqELVAKLRSLQFDQREFVCLKFLVLFSLDVKNLENFQLVEGVQEQVNAALLDYTMCNYPQQTEKFGQLLLRL 203

                        170       180       190
                 ....*....|....*....|....*....|....*
gi 528509165 410 PALRSIGLKCLEHLFFFKLIGDTPIDTFLMEMLEA 444
Cdd:cd07069  204 PEIRAISMQAEEYLYYKHLNGDVPYNNLLIEMLHA 238

DNA-binding domain of the TR2 and TR4 (human testicular receptor 2 and 4) is composed of two C4-type zinc fingers; DNA-binding domain of the TR2 and TR4 (human testicular receptor 2 and 4) is composed of two C4-type zinc fingers. Each zinc finger contains a group of four Cys residues which coordinates a single zinc atom. TR2 and TR4 interact with specific DNA sites upstream of the target gene and modulate the rate of transcriptional initiation. TR4 and TR2 are orphan nuclear receptors; the physiological ligand is as yet unidentified. TR2 is abundantly expressed in the androgen-sensitive prostate. TR4 transcripts are expressed in many tissues, including central nervous system, adrenal gland, spleen, thyroid gland, and prostate. It has been shown that human TR2 binds to a wide spectrum of natural hormone response elements (HREs) with distinct affinities suggesting that TR2 may cross-talk with other gene expression regulation systems. The genes responding to TR2 or TR4 include genes that are regulated by retinoic acid receptor, vitamin D receptor, and peroxisome proliferator-activated receptor. TR4/2 binds to HREs as dimers. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, TR2-like receptors have a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 528509165 124 LCAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDLSYTCRDNKDCLVDKRQRNRCQYCRYQKCLAMGMKREAVQEERQ 200
Cdd:cd06967    5 LCVVCGDKASGRHYGAVSCEGCKGFFKRSIRKNLGYSCRGSKDCVINKHHRNRCQYCRLQKCLAMGMKSDSVQCERK 81

DNA-binding domain of thyroid hormone receptors (TRs) is composed of two C4-type zinc fingers; DNA-binding domain of thyroid hormone receptors (TRs) is composed of two C4-type zinc fingers. Each zinc finger contains a group of four Cys residues which co-ordinates a single zinc atom. TR interacts with the thyroid response element, which is a DNA site with direct repeats of the consensus sequence 5'-AGGTCA-3' separated by one to five base pairs, upstream of target genes and modulates the rate of transcriptional initiation. Thyroid hormone receptor (TR) mediates the actions of thyroid hormones, which play critical roles in growth, development, and homeostasis in mammals. They regulate overall metabolic rate, cholesterol and triglyceride levels, and heart rate, and affect mood. TRs are expressed from two separate genes (alpha and beta) in human and each gene generates two isoforms of the receptor through differential promoter usage or splicing. TRalpha functions in the heart to regulate heart rate and rhythm and TRbeta is active in the liver and other tissues. The unliganded TRs function as transcription repressors, by binding to thyroid hormone response elements (TRE) predominantly as homodimers, or as heterodimers with retinoid X-receptors (RXR), and being associated with a complex of proteins containing corepressor proteins. Ligand binding promotes corepressor dissociation and binding of a coactivator to activate transcription. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, TR has a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 124 LCAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDLSYTCRDNKDCLVDKRQRNRCQYCRYQKCLAMGMKREAVQEERQRNK 203
Cdd:cd06961    1 PCVVCGDKATGYHYRCITCEGCKGFFRRTVQKKLSYSCKGEGKCEIDKVTRNQCQECRFKKCIAVGMAKDLVLDDRKRGA 80

                 ..
gi 528509165 204 ER 205
Cdd:cd06961   81 KR 82

DNA-binding domain of the orphan nuclear receptor, nerve growth factor-induced-B; DNA-binding domain (DBD) of the orphan nuclear receptor, nerve growth factor-induced-B (NGFI-B) is composed of two C4-type zinc fingers. Each zinc finger contains a group of four Cys residues which co-ordinates a single zinc atom. NGFI-B interacts with specific DNA sites upstream of the target gene and modulates the rate of transcriptional initiation. NGFI-B is a member of the nuclear-steroid receptor superfamily. NGFI-B is classified as an orphan receptor because no ligand has yet been identified. NGFI-B is an early immediate gene product of embryo development that is rapidly produced in response to a variety of cellular signals including nerve growth factor. It is involved in T-cell-mediated apoptosis, as well as neuronal differentiation and function. NGFI-B regulates transcription by binding to a specific DNA target upstream of its target genes and regulating the rate of transcriptional initiation. NGFI-B binds to the NGFI-B response element (NBRE) 5'-(A/T)AAAGGTCA as a monomer. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, NGFI-B has a central well-conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|...
gi 528509165 124 LCAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDLSYTCRDNKDCLVDKRQRNRCQYCRYQKCLAMGMKREAVQ 196
Cdd:cd06969    2 LCAVCGDNAACQHYGVRTCEGCKGFFKRTVQKNAKYVCLANKNCPVDKRRRNRCQYCRFQKCLQVGMVKEVVR 74

DNA-binding domain of chicken ovalbumin upstream promoter transcription factors (COUP-TFs) is composed of two C4-type zinc fingers; DNA-binding domain of chicken ovalbumin upstream promoter transcription factors (COUP-TFs) is composed of two C4-type zinc fingers. Each zinc finger contains a group of four Cys residues which co-ordinates a single zinc atom. COUP-TFs are orphan members of the steroid/thyroid hormone receptor superfamily. They are expressed in many tissues and are involved in the regulation of several important biological processes, such as neurogenesis, organogenesis, cell fate determination, and metabolic homeostasis. COUP-TFs homodimerize or heterodimerize with retinoid X receptor (RXR) and a few other nuclear receptors and bind to a variety of response elements that are composed of imperfect AGGTCA direct or inverted repeats with various spacings. COUP-TFs are generally considered to be repressors of transcription for other nuclear hormone receptors such as retinoic acid receptor (RAR), thyroid hormone receptor (TR), vitamin D receptor (VDR), peroxisome proliferator activated receptor (PPAR), and hepatocyte nuclear factor 4 (HNF4). Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, COUP-TFs have a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|..
gi 528509165 125 CAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDLSYTCRDNKDCLVDKRQRNRCQYCRYQKCLAMGMKREAVQ 196
Cdd:cd06958    1 CVVCGDKSSGKHYGQFTCEGCKSFFKRSVRRNLTYTCRGNRNCPIDQHHRNQCQYCRLKKCLKVGMRREAVQ 72

Ligand-binding domain of nuclear hormone receptor; This all helical domain is involved in binding the hormone in these receptors.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165  252 VTNICQAADKQLFTLVEWAKRIPHFSELSLDDQVILLRAGWNELLIASFSHRSITVKDGILLATGLHVHRNSAHSAGVGA 331
Cdd:pfam00104  13 KEELCELWERDLLLVAEWAKHFPEFQELPLEDQMALLKSFWLEWLRLEKAARSAKLRRKKILGEDVLMISDDDAMKFVED 92

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165  332 ------------------IFDRVLTELVSKMRDMQMDKTELGCLRAIILFNPDAKGLSSPSE--VELLREKVYASLEAYC 391
Cdd:pfam00104  93 dsswctnydleqllfflpFFNSYFFELVKPLRELNPDDEELAYLLAQLLFDYAGDGLSGEILeiVEKLQEKLANELHDYY 172

                         170       180
                  ....*....|....*....|....
gi 528509165  392 KQRYPDqqgRFAKLLLRLPALRSI 415
Cdd:pfam00104 173 VNKYSG---RLAKLLKILPSLRKI 193

DNA-binding domain of retinoic acid receptor (RAR) is composed of two C4-type zinc fingers; DNA-binding domain of retinoic acid receptor (RAR) is composed of two C4-type zinc fingers. Each zinc finger contains a group of four Cys residues which co-ordinates a single zinc atom. RAR interacts with specific DNA sites upstream of the target gene and modulates the rate of transcriptional initiation. RARs mediate the biological effect of retinoids, including both natural dietary vitamin A (retinol) metabolites and active synthetic analogs. Retinoids play key roles in a wide variety of essential biological processes, such as vertebrate embryonic morphogenesis and organogenesis, differentiation and apoptosis, and homeostasis. RAR function as a heterodimer with retinoic X receptor by binding to specific RAR response elements (RAREs), which are composed of two direct repeats of the consensus sequence 5'-AGGTCA-3' separated by one to five base pair and found in the promoter regions of retinoid target genes. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, retinoic acid receptors have a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a non-conserved hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 123 RLCAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDLSYTCRDNKDCLVDKRQRNRCQYCRYQKCLAMGMKREAVQEERQRN 202
Cdd:cd06964    5 KPCFVCQDKSSGYHYGVSACEGCKGFFRRSIQKNMVYTCHRDKNCIINKVTRNRCQYCRLQKCFEVGMSKESVRNDRNKK 84

                 .
gi 528509165 203 K 203
Cdd:cd06964   85 K 85

DNA-binding domain of ecdysone-induced DHR4 orphan nuclear receptor is composed of two C4-type zinc fingers; DNA-binding domain of ecdysone-induced DHR4 orphan nuclear receptor is composed of two C4-type zinc fingers. Each zinc finger contains a group of four Cys residues which coordinates a single zinc atom. This domain interacts with specific DNA sites upstream of the target gene and modulates the rate of transcriptional initiation. Ecdysone-induced orphan receptor DHR4 is a member of the nuclear receptor family. DHR4 is expressed during the early Drosophila larval development and is induced by ecdysone. DHR4 coordinates growth and maturation in Drosophila by mediating endocrine response to the attainment of proper body size during larval development. Mutations in DHR4 result in shorter larval development which translates into smaller and lighter flies. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, DHR4 has a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 119 VSQKRLCAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDLSYTCRDNKDCLVDKRQRNRCQYCRYQKCLAMGMKREAVQEE 198
Cdd:cd07168    3 DESPKLCSICEDKATGLHYGIITCEGCKGFFKRTVQNKRVYTCVGDGRCEITKAQRNRCQYCRFRKCIRKGMMLAAVRED 82

                 .
gi 528509165 199 R 199
Cdd:cd07168   83 R 83

The DNA-binding domain of the photoreceptor cell-specific nuclear receptor (PNR) nuclear receptor-like family; The DNA-binding domain of the photoreceptor cell-specific nuclear receptor (PNR) nuclear receptor-like family is composed of two C4-type zinc fingers. Each zinc finger contains a group of four Cys residues which coordinates a single zinc atom. PNR interacts with specific DNA sites upstream of the target gene and modulates the rate of transcriptional initiation. This family includes nuclear receptor Tailless (TLX), photoreceptor cell-specific nuclear receptor (PNR) and related receptors. TLX is an orphan receptor that plays a key role in neural development by regulating cell cycle progression and exit of neural stem cells in the developing brain. PNR is expressed only in the outer layer of retinal photoreceptor cells. It may be involved in the signaling pathway regulating photoreceptor differentiation and/or maintenance. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, PNR-like receptors have a central well-conserved DNA-binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|...
gi 528509165 125 CAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDLSYTCRD-NKDCLVDKRQRNRCQYCRYQKCLAMGMKREAVQ 196
Cdd:cd07154    1 CKVCGDRSSGKHYGVYACDGCSGFFKRSIRRNLLYTCKAgNGSCVVDKARRNQCQACRLKKCLEVSMNKDAVQ 73

The ligand binding domain of the orphan nuclear receptors TR4 and TR2; The ligand binding domain of the TR4 and TR2 (human testicular receptor 4 and 2): TR4 and TR2 are orphan nuclear receptors. Several isoforms of TR4 and TR2 have been isolated in various tissues. TR2 is abundantly expressed in the androgen-sensitive prostate. TR4 transcripts are expressed in many tissues, including central nervous system, adrenal gland, spleen, thyroid gland, and prostate. The expression of TR2 is negatively regulated by androgen, retinoids, and radiation. The expression of both mouse TR2 and TR4 is up-regulated by neurocytokine ciliary neurotrophic factor (CNTF) in mouse. It has shown that human TR2 binds to a wide spectrum of natural hormone response elements (HREs) with distinct affinities suggesting that TR2 may cross-talk with other gene expression regulation systems. The genes responding to TR2 or TR4 include genes that are regulated by retinoic acid receptor, vitamin D receptor, peroxisome proliferator-activated receptor. TR4/2 binds to HREs as a dimer. Like other members of the nuclea r receptor (NR) superfamily of ligand-activated transcription factors, TR2-like receptors have a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 255 ICQAADKQLFTLVEWAKRIPHFSELSLDDQVILLRAGWNELLIASFSHRSITVK-DGILLATGLHVHRNSAH----SAGV 329
Cdd:cd06952   26 ICESASRLLFLSIHWARSIPAFQALGAETQTSLVRACWPELFTLGLAQCSQQLSlPTILAAIINHLQTSIQQdklsADKV 105

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 330 GAIFD--RVLTELVSKMRDMQMDKTELGCLRAIILFNPDAKGLSSPSEVELLREKVYASLEAYCKQRYPDQQGRFAKLLL 407
Cdd:cd06952  106 KQVMEhiNKLQEFVNSMQKLDVDDHEYAYLKAIVLFSPDHPGQELRQQIEKLQEKALMELRDYVGKTYPEDEYRLSKLLL 185

                        170       180
                 ....*....|....*....|....*...
gi 528509165 408 RLPALRSIGLKCLEHLFFFKLIGDTPID 435
Cdd:cd06952  186 RLPPLRSLSPAITEELFFAGLIGNVQID 213

DNA-binding domain of the photoreceptor cell-specific nuclear receptor (PNR) like is composed of two C4-type zinc fingers; The DNA-binding domain of the photoreceptor cell-specific nuclear receptor (PNR) nuclear receptor-like family is composed of two C4-type zinc fingers. Each zinc finger contains a group of four Cys residues which coordinates a single zinc atom. PNR interacts with specific DNA sites upstream of the target gene and modulates the rate of transcriptional initiation. This family includes nuclear receptor Tailless (TLX), photoreceptor cell-specific nuclear receptor (PNR) and related receptors. TLX is an orphan receptor that plays a key role in neural development by regulating cell cycle progression and exit of neural stem cells in the developing brain. PNR is expressed only in the outer layer of retinal photoreceptor cells. It may be involved in the signaling pathway regulating photoreceptor differentiation and/or maintenance. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, PNR-like receptors have a central well-conserved DNA-binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 528509165 125 CAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDLSYTC-RDNKDCLVDKRQRNRCQYCRYQKCLAMGMKREAVQEER 199
Cdd:cd06957    1 CKVCGDKSYGKHYGVYCCDGCSCFFKRSVRKGIIYTCiAGNGNCVVDKARRNWCPFCRLQKCFAVGMNRAAVQEER 76

DNA-binding domain of Drosophila ecdysone-induced protein 78 (E78) like is composed of two C4-type zinc fingers; DNA-binding domain of proteins similar to Drosophila ecdysone-induced protein 78 (E78) is composed of two C4-type zinc fingers. Each zinc finger contains a group of four Cys residues which coordinates a single zinc atom. E78 interacts with specific DNA sites upstream of the target gene and modulates the rate of transcriptional initiation. Drosophila ecdysone-induced protein 78 (E78) is a transcription factor belonging to the nuclear receptor superfamily. E78 is a product of the ecdysone-inducible gene found in an early late puff locus at position 78C during the onset of Drosophila metamorphosis. An E78 orthologue from the Platyhelminth Schistosoma mansoni (SmE78) has also been identified. It is the first E78 orthologue known outside of the molting animals--the Ecdysozoa. The SmE78 may be involved in transduction of an ecdysone signal in S. mansoni, consistent with its function in Drosophila. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, E78-like receptors have a central well conserved DNA-binding domain (DBD), a variable N-terminal domain, a non-conserved hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 125 CAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDLSYTCRDNKDCLVDKRQRNRCQYCRYQKCLAMGMKREAVQEERQRNKE 204
Cdd:cd07165    1 CKVCGDKASGYHYGVTSCEGCKGFFRRSIQKQIEYRCLRDGKCEIIRLNRNRCQYCRFKKCLAAGMSKDSVRYGRIPNRQ 80

                 .
gi 528509165 205 R 205
Cdd:cd07165   81 R 81

The ligand binding domain (LBD) of retinoic acid receptor (RAR), a members of the nuclear receptor superfamily; The ligand binding domain (LBD) of retinoic acid receptor (RAR): Retinoic acid receptors are members of the nuclear receptor (NR) superfamily of ligand-regulated transcription factors. RARs mediate the biological effect of retinoids, including both naturally dietary vitamin A (retinol) metabolites and active synthetic analogs. Retinoids play key roles in a wide variety of essential biological processes, such as vertebrate embryonic morphogenesis and organogenesis, differentiation and apoptosis, and homeostasis. RARs function as heterodimers with retinoic X receptors by binding to specific RAR response elements (RAREs) found in the promoter regions of retinoid target genes. In the absence of ligand, the RAR-RXR heterodimer recruits the corepressor proteins NCoR or AMRT, and associated factors such as histone deacetylases or DNA-methyltransferases, leading to an inactive condensed chromatin structure, preventing transcription. Upon ligand binding, the corepressors are released, and coactivator complexes such as histone acetyltransferase or histone arginine methyltransferases are recruited to activate transcription. There are three RAR subtypes (alpha, beta, gamma), originating from three distinct genes. For each subtype, several isoforms exist that differ in their N-terminal region, allowing retinoids to exert their pleiotropic effects. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, retinoic acid receptors have a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a non-conserved hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 261 KQLFTLVEWAKRIPHFSELSLDDQVILLRAGWNELLIASFSHRSITVKDGILLATGLHVHRNSAHSAGVGAIFDRVLTeL 340
Cdd:cd06937   49 KCIIKIVEFAKRLPGFTTLTIADQITLLKAACLDILILRICTRYTPEQDTMTFSDGLTLNRTQMHNAGFGPLTDLVFT-F 127

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 341 VSKMRDMQMDKTELGCLRAIILFNPDAKGLSSPSEVELLREKVYASLEAYCKQRYPDQQGRFAKLLLRLPALRSIGLKCL 420
Cdd:cd06937  128 ANQLLPLEMDDTEIGLLSAICLICGDRQDLEEPDRVEKLQEPLLEALKIYARKRRPDKPHMFPKMLMKITDLRSISAKGA 207

                        170       180
                 ....*....|....*....|...
gi 528509165 421 EHLFFFKLIGDTPIDTFLMEMLE 443
Cdd:cd06937  208 ERVITLKMEIPGPMPPLISEMLE 230

The ligand binding domain of estrogen receptor-related nuclear receptors; The ligand binding domain of estrogen receptor-related receptors (ERRs): The family of estrogen receptor-related receptors (ERRs), a subfamily of nuclear receptors, is closely related to the estrogen receptor (ER) family, but it lacks the ability to bind estrogen. ERRs can interfere with the classic ER-mediated estrogen signaling pathway, positively or negatively. ERRs share target genes, co-regulators and promoters with the estrogen receptor (ER) family. There are three subtypes of ERRs: alpha, beta and gamma. ERRs bind at least two types of DNA sequence, the estrogen response element and another site, originally characterized as SF-1 (steroidogenic factor 1) response element. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, ERR has a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 224 ILEAEMAVEQKTELHADGSSGGSSPNDPVTNICQAADKQLFTLVEWAKRIPHFSELSLDDQVILLRAGWNELLIASFSHR 303
Cdd:cd06946    1 ILSHLLVAEPDKLFAMPDPALPDSDIKALTTLSDLADRELVVIIGWAKHIPGFSSLSLNDQMSLLQSAWMEILTLGVVFR 80

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 304 SITVKDGILLATGLHVHRNSAHSAGVGAIFDRVLtELVSKMRDMQMDKTELGCLRAIILFNPDAKGLSSPSEVELLREKV 383
Cdd:cd06946   81 SLPFNGELVFAEDFILDEELAREAGLLELYSACL-QLVRRLQRLRLEKEEYVLLKALALANSDSVHIEDVEAVRQLRDAL 159

                        170       180       190       200       210       220
                 ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 528509165 384 YASLEAYCKQRYPDQQGRFA-KLLLRLPALRSIGLKCLEHLFFFKLIGDTPIDTFLMEMLEA 444
Cdd:cd06946  160 LEALSDYEAGRHPGEAPRRAgQLLLTLPLLRQTDGKARRFFYGVKREGKVPMHKLFLEMLEA 221

Ligand binding domain of Estrogen receptor, which are activated by the hormone 17beta-estradiol (estrogen); The ligand binding domain (LBD) of Estrogen receptor (ER): Estrogen receptor, a member of nuclear receptor superfamily, is activated by the hormone estrogen. Estrogen regulates many physiological processes including reproduction, bone integrity, cardiovascular health, and behavior. The main mechanism of action of the estrogen receptor is as a transcription factor by binding to the estrogen response element of target genes upon activation by estrogen and then recruiting coactivator proteins which are responsible for the transcription of target genes. Additionally some ERs may associate with other membrane proteins and can be rapidly activated by exposure of cells to estrogen. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, ER has a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a flexible hinge and a C-terminal ligand binding domain (LBD). The C-terminal LBD also contains AF-2 activation motif, the dimerization motif, and part of the nuclear localization region. Estrogen receptor has been linked to aging, cancer, obesity and other diseases.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 252 VTNIcqaADKQLFTLVEWAKRIPHFSELSLDDQVILLRAGWNELLIASFSHRSITVKDGILLATGLHVHRNSAHS-AGVG 330
Cdd:cd06949   37 LTNL---ADRELVHMINWAKKIPGFVDLSLHDQVHLLESAWLELLMLGLVWRSMEHPGKLLFAPDLLLDRNQGSCvEGMV 113

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 331 AIFDRVLtELVSKMRDMQMDKTELGCLRAIILFNPDAKG-----LSSPSEVELLREKVYASLEAYCKQRY---PDQQGRF 402
Cdd:cd06949  114 EIFDMLL-ATASRFRELQLQREEYVCLKAIILLNSSVYTfllesLESRRQVQRLLDKITDALVHACSKRGlslQQQSRRL 192

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|...
gi 528509165 403 AKLLLRLPALRSIGLKCLEHLFFFKLIGDTPIDTFLMEMLEAP 445
Cdd:cd06949  193 AQLLLILSHIRHVSNKGMEHLYSMKCKNVVPLYDLLLEMLDAH 235

DNA-binding domain of estrogen related receptors (ERR) is composed of two C4-type zinc fingers; DNA-binding domain of estrogen related receptors (ERRs) is composed of two C4-type zinc fingers. Each zinc finger contains a group of four Cys residues which coordinates a single zinc atom. ERR interacts with the palindromic inverted repeat, 5'GGTCAnnnTGACC-3', upstream of the target gene and modulates the rate of transcriptional initiation. The estrogen receptor-related receptors (ERRs) are transcriptional regulators, which are closely related to the estrogen receptor (ER) family. Although ERRs lack the ability to bind to estrogen and are so-called orphan receptors, they share target genes, co-regulators and promoters with the estrogen receptor (ER) family. By targeting the same set of genes, ERRs seem to interfere with the classic ER-mediated estrogen response in various ways. Like other members of the nuclear receptor (NR) superfamily of ligand-activated transcription factors, ERR has a central well conserved DNA binding domain (DBD), a variable N-terminal domain, a non-conserved hinge and a C-terminal ligand binding domain (LBD).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 528509165 122 KRLCAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDLSYTCRDNKDCLVDKRQRNRCQYCRYQKCLAMGMKREAVQEERQR 201
Cdd:cd07170    4 KRLCLVCGDIASGYHYGVASCEACKAFFKRTIQGNIEYSCPATNECEITKRRRKSCQACRFMKCLKVGMLKEGVRLDRVR 83