This group contains class II terpene cyclases, protein prenyltransferases beta subunit, two ...
1-231
1.48e-92
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.
The actual alignment was detected with superfamily member cd02897:
Pssm-ID: 415487 Cd Length: 292 Bit Score: 278.69 E-value: 1.48e-92
Proteins similar to alpha2-macroglobulin (alpha (2)-M). This group also contains the pregnancy ...
1-231
1.48e-92
Proteins similar to alpha2-macroglobulin (alpha (2)-M). This group also contains the pregnancy zone protein (PZP). Alpha(2)-M and PZP are broadly specific proteinase inhibitors. Alpha (2)-M is a major carrier protein in serum. The structural thioester of alpha (2)-M, is involved in the immobilization and entrapment of proteases. PZP is a trace protein in the plasma of non-pregnant females and males which is elevated in pregnancy. Alpha (2)-M and PZ bind to placental protein-14 and may modulate its activity in T-cell growth and cytokine production contributing to fetal survival. It has been suggested that thioester bond cleavage promotes the binding of PZ and alpha (2)-M to the CD91 receptor clearing them from circulation.
Pssm-ID: 239227 Cd Length: 292 Bit Score: 278.69 E-value: 1.48e-92
A-macroglobulin TED domain; This entry corresponds to the TED domain of the complement ...
1-231
1.35e-55
A-macroglobulin TED domain; This entry corresponds to the TED domain of the complement components such as C3, C4 and C5. This domain contains a short highly conserved region of proteinase-binding alpha-macro-globulins contains the cysteine and a glutamine of a thiol-ester bond that is cleaved at the moment of proteinase binding, and mediates the covalent binding of the alpha-macro-globulin to the proteinase. The GCGEQ motif is highly conserved.
Pssm-ID: 462227 [Multi-domain] Cd Length: 311 Bit Score: 184.42 E-value: 1.35e-55
squalene--tetrahymanol cyclase; This enzyme, also called squalene--tetrahymanol cyclase, ...
10-139
2.66e-06
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: 49.25 E-value: 2.66e-06
Proteins similar to alpha2-macroglobulin (alpha (2)-M). This group also contains the pregnancy ...
1-231
1.48e-92
Proteins similar to alpha2-macroglobulin (alpha (2)-M). This group also contains the pregnancy zone protein (PZP). Alpha(2)-M and PZP are broadly specific proteinase inhibitors. Alpha (2)-M is a major carrier protein in serum. The structural thioester of alpha (2)-M, is involved in the immobilization and entrapment of proteases. PZP is a trace protein in the plasma of non-pregnant females and males which is elevated in pregnancy. Alpha (2)-M and PZ bind to placental protein-14 and may modulate its activity in T-cell growth and cytokine production contributing to fetal survival. It has been suggested that thioester bond cleavage promotes the binding of PZ and alpha (2)-M to the CD91 receptor clearing them from circulation.
Pssm-ID: 239227 Cd Length: 292 Bit Score: 278.69 E-value: 1.48e-92
Proteins similar to alpha2-macroglobulin (alpha (2)-M). Alpha (2)-M is a major carrier ...
1-231
3.23e-64
Proteins similar to alpha2-macroglobulin (alpha (2)-M). Alpha (2)-M is a major carrier protein in serum. It is a broadly specific proteinase inhibitor. The structural thioester of alpha (2)-M, is involved in the immobilization and entrapment of proteases. This group contains another broadly specific proteinase inhibitor: pregnancy zone protein (PZP). PZP is a trace protein in the plasma of non-pregnant females and males which is elevated in pregnancy. Alpha (2)-M and PZ bind to placental protein-14 and may modulate its activity in T-cell growth and cytokine production thereby protecting the allogeneic fetus from attack by the maternal immune system. This group also contains C3, C4 and C5 of vertebrate complement. The vertebrate complement is an effector of both the acquired and innate immune systems The point of convergence of the classical, alternative and lectin pathways of the complement system is the proteolytic activation of C3. C4 plays a key role in propagating the classical and lectin pathways. C5 participates in the classical and alternative pathways. The thioester bond located within the structure of C3 and C4 is central to the function of complement. C5 does not contain an active thioester bond.
Pssm-ID: 239221 [Multi-domain] Cd Length: 282 Bit Score: 205.70 E-value: 3.23e-64
Proteins similar to C3, C4 and C5 of vertebrate complement. The vertebrate complement system, ...
1-232
1.13e-58
Proteins similar to C3, C4 and C5 of vertebrate complement. The vertebrate complement system, comprised of a large number of distinct plasma proteins, is an effector of both the acquired and innate immune systems. The point of convergence of the classical, alternative and lectin pathways of the complement system is the proteolytic activation of C3. C4 plays a key role in propagating the classical and lectin pathways. C5 participates in the classical and alternative pathways. The thioester bond located within the structure of C3 and C4 is central to the function of complement. C5 does not contain an active thioester bond.
Pssm-ID: 239226 [Multi-domain] Cd Length: 297 Bit Score: 192.10 E-value: 1.13e-58
A-macroglobulin TED domain; This entry corresponds to the TED domain of the complement ...
1-231
1.35e-55
A-macroglobulin TED domain; This entry corresponds to the TED domain of the complement components such as C3, C4 and C5. This domain contains a short highly conserved region of proteinase-binding alpha-macro-globulins contains the cysteine and a glutamine of a thiol-ester bond that is cleaved at the moment of proteinase binding, and mediates the covalent binding of the alpha-macro-globulin to the proteinase. The GCGEQ motif is highly conserved.
Pssm-ID: 462227 [Multi-domain] Cd Length: 311 Bit Score: 184.42 E-value: 1.35e-55
This group contains class II terpene cyclases, protein prenyltransferases beta subunit, two ...
1-232
2.44e-38
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: 139.22 E-value: 2.44e-38
squalene--tetrahymanol cyclase; This enzyme, also called squalene--tetrahymanol cyclase, ...
10-139
2.66e-06
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: 49.25 E-value: 2.66e-06
squalene-hopene cyclase; SHC is an essential prokaryotic gene in hopanoid (triterpenoid) ...
5-127
2.47e-04
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: 42.95 E-value: 2.47e-04
Squalene cyclase (SQCY) domain; found in class II terpene cyclases that have an alpha 6 - ...
17-127
1.50e-03
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: 40.28 E-value: 1.50e-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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