Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilySqualene synthase 8026474 4001456 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyTerpenoid synthases 8038853 3001615 SCOP2 (2022-06-29)
BSCOP2B SuperfamilyTerpenoid synthases 8038853 3001615 SCOP2B (2022-06-29)
CSCOP2B SuperfamilyTerpenoid synthases 8038853 3001615 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ASQS_PSYe1ezfA1 A: alpha bundlesX: Terpenoid synthases (From Topology)H: Terpenoid synthases (From Topology)T: Terpenoid synthasesF: SQS_PSYECOD (1.6)
BSQS_PSYe1ezfB1 A: alpha bundlesX: Terpenoid synthases (From Topology)H: Terpenoid synthases (From Topology)T: Terpenoid synthasesF: SQS_PSYECOD (1.6)
CSQS_PSYe1ezfC1 A: alpha bundlesX: Terpenoid synthases (From Topology)H: Terpenoid synthases (From Topology)T: Terpenoid synthasesF: SQS_PSYECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B, C
PF00494Squalene/phytoene synthase (SQS_PSY)Squalene/phytoene synthase- Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B, C
FARNESYL-DIPHOSPHATE FARNESYLTRANSFERASE

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
squalene synthase  M-CSA #264

Squalene synthase is a member of the Isoprenoid Synthase Type I superfamily. These enzymes catalyse the formation of squalene by the reductive dimerisation of two farnesyl diphosphate molecules in a two-step reaction (2 farnesyl diphosphate --> presqualene diphosphate; presqualene diphosphate + NAD(P)H --> squalene). In the human enzyme, the first half reaction occurs at one end of a large channel (surrounded by five alpha helices runs through the centre of the protein). Then the intermediate is thought to move into an enclosed pocket where the second half reaction occurs. This reaction occurs at the final branch point of the isoprenoid biosynthesis pathway, and is the first committed step in cholesterol biosynthesis.

Defined by 4 residues: TYR:A-141 [auth A-171]ARG:A-188 [auth A-218]ARG:A-198 [auth A-228]PHE:A-258 [auth A-288]
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Explore in 3DM-CSA Motif Definition
Extent of motif is too large to support Structure Motif searching.
EC: 2.5.1.21 (PDB Primary Data)