Squalene cyclase (SQCY) domain subgroup 1; found in class II terpene cyclases that have an ...
99-758
0e+00
Squalene cyclase (SQCY) domain subgroup 1; found in class II terpene cyclases that have an alpha 6 - alpha 6 barrel fold. Squalene cyclase (SQCY) and 2,3-oxidosqualene cyclase (OSQCY) are integral membrane proteins that catalyze a cationic cyclization cascade converting linear triterpenes to fused ring compounds. This group contains bacterial SQCY which catalyzes the convertion of squalene to hopene or diplopterol and eukaryotic OSQCY which transforms the 2,3-epoxide of squalene to compounds such as, lanosterol in mammals and fungi or, cycloartenol in plants. Deletion of a single glycine residue of Alicyclobacillus acidocaldarius SQCY alters its substrate specificity into that of eukaryotic OSQCY. Both enzymes have a second minor domain, which forms an alpha-alpha barrel that is inserted into the major domain.
Pssm-ID: 239222 [Multi-domain] Cd Length: 634 Bit Score: 885.77 E-value: 0e+00
squalene/oxidosqualene cyclases; This family of enzymes catalyzes the cyclization of the ...
98-760
0e+00
squalene/oxidosqualene cyclases; This family of enzymes catalyzes the cyclization of the triterpenes squalene or 2-3-oxidosqualene to a variety of products including hopene, lanosterol, cycloartenol, amyrin, lupeol, and isomultiflorenol.
Pssm-ID: 273809 [Multi-domain] Cd Length: 621 Bit Score: 659.90 E-value: 0e+00
Squalene-hopene cyclase N-terminal domain; Squalene-hopene cyclase, EC:5.4.99.17, catalyzes the cyclization of squalene into hopene in bacteria. This reaction is part of a cationic cyclization cascade, which is homologous to a key step in cholesterol biosynthesis. This family is the N-terminal domain.
Pssm-ID: 433061 [Multi-domain] Cd Length: 290 Bit Score: 128.37 E-value: 9.70e-33
Squalene cyclase (SQCY) domain subgroup 1; found in class II terpene cyclases that have an ...
99-758
0e+00
Squalene cyclase (SQCY) domain subgroup 1; found in class II terpene cyclases that have an alpha 6 - alpha 6 barrel fold. Squalene cyclase (SQCY) and 2,3-oxidosqualene cyclase (OSQCY) are integral membrane proteins that catalyze a cationic cyclization cascade converting linear triterpenes to fused ring compounds. This group contains bacterial SQCY which catalyzes the convertion of squalene to hopene or diplopterol and eukaryotic OSQCY which transforms the 2,3-epoxide of squalene to compounds such as, lanosterol in mammals and fungi or, cycloartenol in plants. Deletion of a single glycine residue of Alicyclobacillus acidocaldarius SQCY alters its substrate specificity into that of eukaryotic OSQCY. Both enzymes have a second minor domain, which forms an alpha-alpha barrel that is inserted into the major domain.
Pssm-ID: 239222 [Multi-domain] Cd Length: 634 Bit Score: 885.77 E-value: 0e+00
squalene/oxidosqualene cyclases; This family of enzymes catalyzes the cyclization of the ...
98-760
0e+00
squalene/oxidosqualene cyclases; This family of enzymes catalyzes the cyclization of the triterpenes squalene or 2-3-oxidosqualene to a variety of products including hopene, lanosterol, cycloartenol, amyrin, lupeol, and isomultiflorenol.
Pssm-ID: 273809 [Multi-domain] Cd Length: 621 Bit Score: 659.90 E-value: 0e+00
2,3-oxidosqualene cyclase; This model identifies 2,3-oxidosqualene cyclases from Stigmatella ...
108-758
2.19e-151
2,3-oxidosqualene cyclase; This model identifies 2,3-oxidosqualene cyclases from Stigmatella aurantiaca which produces cycloartenol, and Gemmata obscuriglobus and Methylococcus capsulatus, which each produce the closely related sterol, lanosterol.
Pssm-ID: 274591 [Multi-domain] Cd Length: 634 Bit Score: 455.99 E-value: 2.19e-151
Squalene cyclase (SQCY) domain; found in class II terpene cyclases that have an alpha 6 - ...
401-758
6.26e-151
Squalene cyclase (SQCY) domain; found in class II terpene cyclases that have an alpha 6 - alpha 6 barrel fold. Squalene cyclase (SQCY) and 2,3-oxidosqualene cyclase (OSQCY) are integral membrane proteins that catalyze a cationic cyclization cascade converting linear triterpenes to fused ring compounds. Bacterial SQCY catalyzes the convertion of squalene to hopene or diplopterol. Eukaryotic OSQCY transforms the 2,3-epoxide of squalene to compounds such as, lanosterol (a metabolic precursor of cholesterol and steroid hormones) in mammals and fungi or, cycloartenol in plants. Deletion of a single glycine residue of Alicyclobacillus acidocaldarius SQCY alters its substrate specificity into that of eukaryotic OSQCY. Both enzymes have a second minor domain, which forms an alpha-alpha barrel that is inserted into the major domain. This group also contains SQCY-like archael sequences and some bacterial SQCY's which lack this minor domain.
Pssm-ID: 239219 [Multi-domain] Cd Length: 348 Bit Score: 443.97 E-value: 6.26e-151
squalene-hopene cyclase; SHC is an essential prokaryotic gene in hopanoid (triterpenoid) ...
92-761
1.19e-54
squalene-hopene cyclase; SHC is an essential prokaryotic gene in hopanoid (triterpenoid) biosynthesis. Squalene hopene cyclase, an integral membrane protein, directly cyclizes squalene into hopanoid products. [Fatty acid and phospholipid metabolism, Other]
Pssm-ID: 273661 [Multi-domain] Cd Length: 635 Bit Score: 199.34 E-value: 1.19e-54
This group contains class II terpene cyclases, protein prenyltransferases beta subunit, two ...
395-758
7.06e-47
This group contains class II terpene cyclases, protein prenyltransferases beta subunit, two broadly specific proteinase inhibitors alpha2-macroglobulin (alpha (2)-M) and pregnancy zone protein (PZP) and, the C3 C4 and C5 components of vertebrate complement. Class II terpene cyclases include squalene cyclase (SQCY) and 2,3-oxidosqualene cyclase (OSQCY), these integral membrane proteins catalyze a cationic cyclization cascade converting linear triterpenes to fused ring compounds. The protein prenyltransferases include protein farnesyltransferase (FTase) and geranylgeranyltransferase types I and II (GGTase-I and GGTase-II) which catalyze the carboxyl-terminal lipidation of Ras, Rab, and several other cellular signal transduction proteins, facilitating membrane associations and specific protein-protein interactions. Alpha (2)-M is a major carrier protein in serum and involved in the immobilization and entrapment of proteases. PZP is a pregnancy associated protein. Alpha (2)-M and PZP are known to bind to and, may modulate, the activity of placental protein-14 in T-cell growth and cytokine production thereby protecting the allogeneic fetus from attack by the maternal immune system.
Pssm-ID: 238362 [Multi-domain] Cd Length: 300 Bit Score: 168.88 E-value: 7.06e-47
Squalene-hopene cyclase N-terminal domain; Squalene-hopene cyclase, EC:5.4.99.17, catalyzes the cyclization of squalene into hopene in bacteria. This reaction is part of a cationic cyclization cascade, which is homologous to a key step in cholesterol biosynthesis. This family is the N-terminal domain.
Pssm-ID: 433061 [Multi-domain] Cd Length: 290 Bit Score: 128.37 E-value: 9.70e-33
Squalene-hopene cyclase C-terminal domain; Squalene-hopene cyclase, EC:5.4.99.17, catalyzes the cyclization of squalene into hopene in bacteria. This reaction is part of a cationic cyclization cascade, which is homologous to a key step in cholesterol biosynthesis. This family is the C-terminal half of the molecule.
Pssm-ID: 433057 [Multi-domain] Cd Length: 319 Bit Score: 127.84 E-value: 2.75e-32
Squalene cyclase (SQCY) domain; found in class II terpene cyclases that have an alpha 6 - ...
598-726
5.16e-09
Squalene cyclase (SQCY) domain; found in class II terpene cyclases that have an alpha 6 - alpha 6 barrel fold. Squalene cyclase (SQCY) and 2,3-oxidosqualene cyclase (OSQCY) are integral membrane proteins that catalyze a cationic cyclization cascade converting linear triterpenes to fused ring compounds. Bacterial SQCY catalyzes the convertion of squalene to hopene or diplopterol. Eukaryotic OSQCY transforms the 2,3-epoxide of squalene to compounds such as, lanosterol (a metabolic precursor of cholesterol and steroid hormones) in mammals and fungi or, cycloartenol in plants. Deletion of a single glycine residue of Alicyclobacillus acidocaldarius SQCY alters its substrate specificity into that of eukaryotic OSQCY. Both enzymes have a second minor domain, which forms an alpha-alpha barrel that is inserted into the major domain. This group also contains SQCY-like archael sequences and some bacterial SQCY's which lack this minor domain.
Pssm-ID: 239219 [Multi-domain] Cd Length: 348 Bit Score: 58.77 E-value: 5.16e-09
squalene--tetrahymanol cyclase; This enzyme, also called squalene--tetrahymanol cyclase, ...
598-760
2.33e-08
squalene--tetrahymanol cyclase; This enzyme, also called squalene--tetrahymanol cyclase, occurs a small number of eukaryotes, some of them anaerobic. The pathway can occur under anaerobic conditions, and the product is thought to replace sterols, letting organisms with this compound build membrane suitable for performing phagocytosis.
Pssm-ID: 212000 [Multi-domain] Cd Length: 624 Bit Score: 57.33 E-value: 2.33e-08
This group contains class II terpene cyclases, protein prenyltransferases beta subunit, two ...
598-726
4.03e-08
This group contains class II terpene cyclases, protein prenyltransferases beta subunit, two broadly specific proteinase inhibitors alpha2-macroglobulin (alpha (2)-M) and pregnancy zone protein (PZP) and, the C3 C4 and C5 components of vertebrate complement. Class II terpene cyclases include squalene cyclase (SQCY) and 2,3-oxidosqualene cyclase (OSQCY), these integral membrane proteins catalyze a cationic cyclization cascade converting linear triterpenes to fused ring compounds. The protein prenyltransferases include protein farnesyltransferase (FTase) and geranylgeranyltransferase types I and II (GGTase-I and GGTase-II) which catalyze the carboxyl-terminal lipidation of Ras, Rab, and several other cellular signal transduction proteins, facilitating membrane associations and specific protein-protein interactions. Alpha (2)-M is a major carrier protein in serum and involved in the immobilization and entrapment of proteases. PZP is a pregnancy associated protein. Alpha (2)-M and PZP are known to bind to and, may modulate, the activity of placental protein-14 in T-cell growth and cytokine production thereby protecting the allogeneic fetus from attack by the maternal immune system.
Pssm-ID: 238362 [Multi-domain] Cd Length: 300 Bit Score: 55.63 E-value: 4.03e-08
This group contains class II terpene cyclases, protein prenyltransferases beta subunit, two ...
99-213
3.72e-04
This group contains class II terpene cyclases, protein prenyltransferases beta subunit, two broadly specific proteinase inhibitors alpha2-macroglobulin (alpha (2)-M) and pregnancy zone protein (PZP) and, the C3 C4 and C5 components of vertebrate complement. Class II terpene cyclases include squalene cyclase (SQCY) and 2,3-oxidosqualene cyclase (OSQCY), these integral membrane proteins catalyze a cationic cyclization cascade converting linear triterpenes to fused ring compounds. The protein prenyltransferases include protein farnesyltransferase (FTase) and geranylgeranyltransferase types I and II (GGTase-I and GGTase-II) which catalyze the carboxyl-terminal lipidation of Ras, Rab, and several other cellular signal transduction proteins, facilitating membrane associations and specific protein-protein interactions. Alpha (2)-M is a major carrier protein in serum and involved in the immobilization and entrapment of proteases. PZP is a pregnancy associated protein. Alpha (2)-M and PZP are known to bind to and, may modulate, the activity of placental protein-14 in T-cell growth and cytokine production thereby protecting the allogeneic fetus from attack by the maternal immune system.
Pssm-ID: 238362 [Multi-domain] Cd Length: 300 Bit Score: 43.31 E-value: 3.72e-04
Geranylgeranyltransferase type II (GGTase-II)_like proteins containing the protein ...
572-665
1.57e-03
Geranylgeranyltransferase type II (GGTase-II)_like proteins containing the protein prenyltransferase (PTase) domain, beta subunit (alpha 6 - alpha 6 barrel fold). GGTase-IIs are a subgroup of the protein prenyltransferase family of lipid-modifying enzymes. PTases catalyze the carboxyl-terminal lipidation of Ras, Rab, and several other cellular signal transduction proteins, facilitating membrane associations and specific protein-protein interactions. Prenyltransferases employ a Zn2+ ion to alkylate a thiol group catalyzing the formation of thioether linkages between cysteine residues at or near the C-terminus of protein acceptors and the C1 atom of isoprenoid lipids (geranylgeranyl (20-carbon) in the case of GGTase-II ). GGTase-II catalyzes alkylation of both cysteine residues in Rab proteins containing carboxy-terminal "CC", "CXCX" or "CXC" motifs. PTases are heterodimeric with both alpha and beta subunits required for catalytic activity. In contrast to other prenyltransferases, GGTas-II requires an escort protein to bring the substrate protein to the catalytic heterodimer and to escort the geryanylgeranylated product to the membrane.
Pssm-ID: 239224 [Multi-domain] Cd Length: 287 Bit Score: 41.10 E-value: 1.57e-03
This group contains class II terpene cyclases, protein prenyltransferases beta subunit, two ...
98-213
8.52e-03
This group contains class II terpene cyclases, protein prenyltransferases beta subunit, two broadly specific proteinase inhibitors alpha2-macroglobulin (alpha (2)-M) and pregnancy zone protein (PZP) and, the C3 C4 and C5 components of vertebrate complement. Class II terpene cyclases include squalene cyclase (SQCY) and 2,3-oxidosqualene cyclase (OSQCY), these integral membrane proteins catalyze a cationic cyclization cascade converting linear triterpenes to fused ring compounds. The protein prenyltransferases include protein farnesyltransferase (FTase) and geranylgeranyltransferase types I and II (GGTase-I and GGTase-II) which catalyze the carboxyl-terminal lipidation of Ras, Rab, and several other cellular signal transduction proteins, facilitating membrane associations and specific protein-protein interactions. Alpha (2)-M is a major carrier protein in serum and involved in the immobilization and entrapment of proteases. PZP is a pregnancy associated protein. Alpha (2)-M and PZP are known to bind to and, may modulate, the activity of placental protein-14 in T-cell growth and cytokine production thereby protecting the allogeneic fetus from attack by the maternal immune system.
Pssm-ID: 238362 [Multi-domain] Cd Length: 300 Bit Score: 39.07 E-value: 8.52e-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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