Annotations: 1SQC

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1sqca1	All alpha proteins	alpha/alpha toroid	Terpenoid cyclases/Protein prenyltransferases	Terpene synthases	Squalene-hopene cyclase	(Alicyclobacillus acidocaldarius ) [TaxId: 405212 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Terpenoid cyclases/Protein prenyltransferases	8038394	3001024	SCOP2B (2021-05-27)
A	SCOP2B Superfamily	Terpenoid cyclases/Protein prenyltransferases	8038392	3001024	SCOP2B (2021-05-27)
A	SCOP2B Superfamily	Terpenoid cyclases/Protein prenyltransferases	8038392	3001024	SCOP2B (2021-05-27)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF13243	e1sqcA1	A: alpha superhelices	X: Repetitive alpha hairpins	H: alpha/alpha toroid (From Topology)	T: alpha/alpha toroid	F: PF13243	ECOD (1.6)
A	PF13249	e1sqcA2	A: alpha superhelices	X: Repetitive alpha hairpins	H: alpha/alpha toroid (From Topology)	T: alpha/alpha toroid	F: PF13249	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.50.10.20	Mainly Alpha	Alpha/alpha barrel	Glycosyltransferase		CATH (4.2.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF13243	Squalene-hopene cyclase C-terminal domain (SQHop_cyclase_C)	Squalene-hopene cyclase C-terminal domain	-	Repeat
A	PF00432	Prenyltransferase and squalene oxidase repeat (Prenyltrans)	Prenyltransferase and squalene oxidase repeat	-	Repeat

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	SQUALENE-HOPENE CYCLASE	squalene cyclase activity isomerase activity squalene-hopene cyclase activity cyclase activity catalytic activity intramolecular transferase activity lanosterol synthase activity oxidosqualene cyclase activity lyase activity	organic hydroxy compound metabolic process steroid metabolic process sterol metabolic process lipid biosynthetic process alcohol metabolic process ergosterol biosynthetic process cellular lipid biosynthetic process small molecule metabolic process ergosterol metabolic process steroid biosynthetic process phytosteroid metabolic process secondary alcohol biosynthetic process small molecule biosynthetic process cellular metabolic process organic hydroxy compound metabolic process steroid metabolic process sterol metabolic process lipid biosynthetic process alcohol metabolic process ergosterol biosynthetic process cellular lipid biosynthetic process small molecule metabolic process ergosterol metabolic process steroid biosynthetic process phytosteroid metabolic process secondary alcohol biosynthetic process small molecule biosynthetic process cellular metabolic process primary metabolic process phytosteroid biosynthetic process secondary alcohol metabolic process biosynthetic process sterol biosynthetic process organic hydroxy compound biosynthetic process alcohol biosynthetic process cellular lipid metabolic process metabolic process cellular process lipid metabolic process cholesterol biosynthetic process cholesterol metabolic process triterpenoid biosynthetic process triterpenoid metabolic process isoprenoid biosynthetic process cellular biosynthetic process terpenoid biosynthetic process terpenoid metabolic process isoprenoid metabolic process	lipid droplet intracellular organelle intracellular anatomical structure organelle intracellular non-membrane-bounded organelle cellular anatomical entity non-membrane-bounded organelle cell periphery plasma membrane membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR032697	Squalene cyclase, N-terminal	Domain
A	IPR032696	Squalene cyclase, C-terminal	Domain
A	IPR018333	Squalene cyclase	Family
A	IPR002365	Terpene synthase, conserved site	Conserved Site
A	IPR006400	Squalene hopene cyclase	Family
A	IPR008930	Terpenoid cyclases/protein prenyltransferase alpha-alpha toroid	Homologous Superfamily

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.