The C-terminal substrate binding domain of LysR-type transcriptional regulator, HupR, which ...
93-288
3.73e-49
The C-terminal substrate binding domain of LysR-type transcriptional regulator, HupR, which regulates expression of the heme uptake receptor HupA; contains the type 2 periplasmic binding fold; HupR, a member of the LysR family, activates hupA transcription under low-iron conditions in the presence of hemin. The expression of many iron-uptake genes, such as hupA, is regulated at the transcriptional level by iron and an iron-binding repressor protein called Fur (ferric uptake regulation). Under iron-abundant conditions with heme, the active Fur repressor protein represses transcription of the iron-uptake gene hupA, and prevents transcriptional activation via HupR. Under low-iron conditions with heme, the Fur repressor is inactive and transcription of the hupA is allowed. This substrate-binding domain shows significant homology to the type 2 periplasmic binding proteins (PBP2), which are responsible for the uptake of a variety of substrates such as phosphate, sulfate, polysaccharides, lysine/arginine/ornithine, and histidine. The PBP2 bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two cytoplasmically located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis.
Pssm-ID: 176122 [Multi-domain] Cd Length: 195 Bit Score: 162.05 E-value: 3.73e-49
LysR substrate binding domain; The structure of this domain is known and is similar to the ...
91-290
3.57e-24
LysR substrate binding domain; The structure of this domain is known and is similar to the periplasmic binding proteins. This domain binds a variety of ligands that caries in size and structure, such as amino acids, sugar phosphates, organic acids, metal cations, flavonoids, C6-ring carboxylic acids, H2O2, HOCl, homocysteine, NADPH, ATP, sulphate, muropeptides, acetate, salicylate, citrate, phenol- and quinolone derivatives, acetylserines, fatty acid CoA, shikimate, chorismate, homocysteine, indole-3-acetic acid, Na(I), c-di-GMP, ppGpp and hydrogen peroxide (Matilla et. al., FEMS Microbiology Reviews, fuab043, 45, 2021, 1. https://doi.org/10.1093/femsre/fuab043).
Pssm-ID: 460931 [Multi-domain] Cd Length: 205 Bit Score: 97.36 E-value: 3.57e-24
transcriptional regulator, ArgP family; ArgP used to be known as IciA. ArgP is a positive ...
7-72
1.26e-09
transcriptional regulator, ArgP family; ArgP used to be known as IciA. ArgP is a positive regulator of argK. It is a negative autoregulator in presence of arginine. It competes with DnaA for oriC iteron (13-mer) binding. It activates dnaA and nrd transcription. It has been demonstrated to be part of the pho regulon (). ArgP mutants convey canavanine (an L-arginine structural homolog) sensitivity. [Cellular processes, Toxin production and resistance, DNA metabolism, DNA replication, recombination, and repair, Regulatory functions, DNA interactions]
Pssm-ID: 274509 [Multi-domain] Cd Length: 292 Bit Score: 58.00 E-value: 1.26e-09
The C-terminal substrate binding domain of LysR-type transcriptional regulator, HupR, which ...
93-288
3.73e-49
The C-terminal substrate binding domain of LysR-type transcriptional regulator, HupR, which regulates expression of the heme uptake receptor HupA; contains the type 2 periplasmic binding fold; HupR, a member of the LysR family, activates hupA transcription under low-iron conditions in the presence of hemin. The expression of many iron-uptake genes, such as hupA, is regulated at the transcriptional level by iron and an iron-binding repressor protein called Fur (ferric uptake regulation). Under iron-abundant conditions with heme, the active Fur repressor protein represses transcription of the iron-uptake gene hupA, and prevents transcriptional activation via HupR. Under low-iron conditions with heme, the Fur repressor is inactive and transcription of the hupA is allowed. This substrate-binding domain shows significant homology to the type 2 periplasmic binding proteins (PBP2), which are responsible for the uptake of a variety of substrates such as phosphate, sulfate, polysaccharides, lysine/arginine/ornithine, and histidine. The PBP2 bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two cytoplasmically located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis.
Pssm-ID: 176122 [Multi-domain] Cd Length: 195 Bit Score: 162.05 E-value: 3.73e-49
LysR substrate binding domain; The structure of this domain is known and is similar to the ...
91-290
3.57e-24
LysR substrate binding domain; The structure of this domain is known and is similar to the periplasmic binding proteins. This domain binds a variety of ligands that caries in size and structure, such as amino acids, sugar phosphates, organic acids, metal cations, flavonoids, C6-ring carboxylic acids, H2O2, HOCl, homocysteine, NADPH, ATP, sulphate, muropeptides, acetate, salicylate, citrate, phenol- and quinolone derivatives, acetylserines, fatty acid CoA, shikimate, chorismate, homocysteine, indole-3-acetic acid, Na(I), c-di-GMP, ppGpp and hydrogen peroxide (Matilla et. al., FEMS Microbiology Reviews, fuab043, 45, 2021, 1. https://doi.org/10.1093/femsre/fuab043).
Pssm-ID: 460931 [Multi-domain] Cd Length: 205 Bit Score: 97.36 E-value: 3.57e-24
The substrate binding domain of LysR-type transcriptional regulators (LTTRs), a member of the ...
109-288
7.36e-12
The substrate binding domain of LysR-type transcriptional regulators (LTTRs), a member of the type 2 periplasmic binding fold protein superfamily; This model and hierarchy represent the the substrate-binding domain of the LysR-type transcriptional regulators that form the largest family of prokaryotic transcription factor. Homologs of some of LTTRs with similar domain organizations are also found in the archaea and eukaryotic organisms. The LTTRs are composed of two functional domains joined by a linker helix involved in oligomerization: an N-terminal HTH (helix-turn-helix) domain, which is responsible for the DNA-binding specificity, and a C-terminal substrate-binding domain, which is structurally homologous to the type 2 periplasmic binding proteins. As also observed in the periplasmic binding proteins, the C-terminal domain of the bacterial transcriptional repressor undergoes a conformational change upon substrate binding which in turn changes the DNA binding affinity of the repressor. The genes controlled by the LTTRs have diverse functional roles including amino acid biosynthesis, CO2 fixation, antibiotic resistance, degradation of aromatic compounds, oxidative stress responses, nodule formation of nitrogen-fixing bacteria, synthesis of virulence factors, toxin production, attachment and secretion, to name a few. The structural topology of this substrate-binding domain is most similar to that of the type 2 periplasmic binding proteins (PBP2), which are responsible for the uptake of a variety of substrates such as phosphate, sulfate, polysaccharides, lysine/arginine/ornithine, and histidine. The PBP2 bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two cytoplasmically located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis. Besides transport proteins, the PBP2 superfamily includes the substrate-binding domains from ionotropic glutamate receptors, LysR-like transcriptional regulators, and unorthodox sensor proteins involved in signal transduction.
Pssm-ID: 176102 [Multi-domain] Cd Length: 197 Bit Score: 63.39 E-value: 7.36e-12
transcriptional regulator, ArgP family; ArgP used to be known as IciA. ArgP is a positive ...
7-72
1.26e-09
transcriptional regulator, ArgP family; ArgP used to be known as IciA. ArgP is a positive regulator of argK. It is a negative autoregulator in presence of arginine. It competes with DnaA for oriC iteron (13-mer) binding. It activates dnaA and nrd transcription. It has been demonstrated to be part of the pho regulon (). ArgP mutants convey canavanine (an L-arginine structural homolog) sensitivity. [Cellular processes, Toxin production and resistance, DNA metabolism, DNA replication, recombination, and repair, Regulatory functions, DNA interactions]
Pssm-ID: 274509 [Multi-domain] Cd Length: 292 Bit Score: 58.00 E-value: 1.26e-09
The C-terminal substrate binding domain of LysR-type transcriptional regulators that involved ...
135-286
1.11e-07
The C-terminal substrate binding domain of LysR-type transcriptional regulators that involved in the catabolism of nitroaromatic/naphthalene compounds and that of related regulators; contains the type 2 periplasmic binding fold; This CD includes the C-terminal substrate binding domain of LysR-type transcriptional regulators involved in the catabolism of dinitrotoluene and similar compounds, such as DntR, NahR, and LinR. The transcription of the genes encoding enzymes involved in such degradation is regulated and expression of these enzymes is enhanced by inducers, which are either an intermediate in the metabolic pathway or compounds to be degraded. Also included are related LysR-type regulators clustered together in phylogenetic trees, including NodD, ToxR, LeuO, SyrM, TdcA, and PnbR. This substrate-binding domain shows significant homology to the type 2 periplasmic binding proteins (PBP2), which are responsible for the uptake of a variety of substrates such as phosphate, sulfate, polysaccharides, lysine/arginine/ornithine, and histidine. The PBP2 bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two cytoplasmically located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis.
Pssm-ID: 176109 [Multi-domain] Cd Length: 200 Bit Score: 51.45 E-value: 1.11e-07
The C-terminal substrate binding domain of LysR-type transcriptional regulator TdcA, which is ...
110-286
3.50e-04
The C-terminal substrate binding domain of LysR-type transcriptional regulator TdcA, which is involved in the degradation of L-serine and L-threonine, contains the type 2 periplasmic binding fold; TdcA, a member of the LysR family, activates the expression of the anaerobically-regulated tdcABCDEFG operon which is involved in the degradation of L-serine and L-threonine to acetate and propionate, respectively. The tdc operon is comprised of one regulatory gene tdcA and six structural genes, tdcB to tdcG. The expression of the tdc operon is affected by several transcription factors including the cAMP receptor protein (CRP), integration host factor (IHF), histone-like protein (HU), and the operon specific regulators TdcA and TcdR. TcdR is divergently transcribed from the operon and encodes a small protein that is required for efficient expression of the Escherichia coli tdc operon. This substrate-binding domain shows significant homology to the type 2 periplasmic binding proteins (PBP2), which are responsible for the uptake of a variety of substrates such as phosphate, sulfate, polysaccharides, lysine/arginine/ornithine, and histidine. The PBP2 bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two cytoplasmically located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis.
Pssm-ID: 176110 [Multi-domain] Cd Length: 201 Bit Score: 40.80 E-value: 3.50e-04
The C-terminal substrate binding domain of LysR-type transcriptional regulator PnbR, which is ...
133-290
1.89e-03
The C-terminal substrate binding domain of LysR-type transcriptional regulator PnbR, which is involved in regulating the pnb genes encoding enzymes for 4-nitrobenzoate catabolism, contains the type 2 periplasmic binding fold; PnbR is the regulator of one or both of the two pnb genes that encoding enzymes for 4-nitrobenzoate catabolism. In Pseudomonas putida strain, pnbA encodes a 4-nitrobenzoate reductase, which is responsible for catalyzing the direct reduction of 4-nitrobenzoate to 4-hydroxylaminobenzoate, and pnbB encodes a 4-hydroxylaminobenzoate lyase, which catalyzes the conversion of 4-hydroxylaminobenzoate to 3, 4-dihydroxybenzoic acid and ammonium. The topology of this substrate-binding domain is most similar to that of the type 2 periplasmic binding proteins (PBP2), which are responsible for the uptake of a variety of substrates such as phosphate, sulfate, polysaccharides, lysine/arginine/ornithine, and histidine. The PBP2 bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two cytoplasmically located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis.
Pssm-ID: 176158 Cd Length: 221 Bit Score: 38.93 E-value: 1.89e-03
C-terminal substrate binding domain of LysR-type transcriptional regulator CysL, which ...
109-262
4.69e-03
C-terminal substrate binding domain of LysR-type transcriptional regulator CysL, which activates the transcription of the cysJI operon encoding sulfite reductase, contains the type 2 periplasmic binding fold; CysL, also known as YwfK, is a regular of sulfur metabolism in Bacillus subtilis. Sulfur is required for the synthesis of proteins and essential cofactors in all living organism. Sulfur can be assimilated either from inorganic sources (sulfate and thiosulfate), or from organic sources (sulfate esters, sulfamates, and sulfonates). CysL activates the transcription of the cysJI operon encoding sulfite reductase, which reduces sulfite to sulfide. Both cysL mutant and cysJI mutant are unable to grow using sulfate or sulfite as the sulfur source. Like other LysR-type regulators, CysL also negatively regulates its own transcription. In Escherichia coli, three LysR-type activators are involved in the regulation of sulfur metabolism: CysB, Cbl and MetR. The topology of this substrate-binding domain is most similar to that of the type 2 periplasmic binding proteins (PBP2), which are responsible for the uptake of a variety of substrates such as phosphate, sulfate, polysaccharides, lysine/arginine/ornithine, and histidine. The PBP2 bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two cytoplasmically located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis.
Pssm-ID: 176112 [Multi-domain] Cd Length: 201 Bit Score: 37.47 E-value: 4.69e-03
The C-terminal substrate binding domain of LysR-type transcriptional regulator, IlvR, involved ...
231-288
5.65e-03
The C-terminal substrate binding domain of LysR-type transcriptional regulator, IlvR, involved in the biosynthesis of isoleucine, leucine and valine; contains type 2 periplasmic binding fold; The IlvR is an activator of the upstream and divergently transcribed ilvD gene, which encodes dihydroxy acid dehydratase that participates in isoleucine, leucine, and valine biosynthesis. As in the case of other members of the LysR family, the expression of ilvR gene is repressed in the presence of its own gene product. This substrate-binding domain shows significant homology to the type 2 periplasmic binding proteins (PBP2), which are responsible for the uptake of a variety of substrates such as phosphate, sulfate, polysaccharides, lysine/arginine/ornithine, and histidine. The PBP2 bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two cytoplasmically located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis.
Pssm-ID: 176144 [Multi-domain] Cd Length: 200 Bit Score: 37.34 E-value: 5.65e-03
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
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