Annotations: 4HD1

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	AP_endonuc_2	e4hd1A1	A: a/b three-layered sandwiches	X: Globin-like	H: Nucleoside diphosphate kinases	T: Nucleoside diphosphate kinases	F: AP_endonuc_2	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.600.10	Mainly Alpha	Orthogonal Bundle	Farnesyl Diphosphate Synthase	Farnesyl Diphosphate Synthase	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00494	Squalene/phytoene synthase (SQS_PSY)	Squalene/phytoene synthase		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Squalene synthase HpnC	geranylgeranyl diphosphate synthase activity prenyl diphosphate synthase activity prenyltransferase activity transferase activity transferase activity, transferring alkyl or aryl (other than methyl) groups catalytic activity squalene synthase [NAD(P)H] activity	biosynthetic process isoprenoid biosynthetic process lipid biosynthetic process primary metabolic process metabolic process cellular process terpenoid biosynthetic process terpenoid metabolic process lipid metabolic process isoprenoid metabolic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR044843	Trans-isoprenyl diphosphate synthases, bacterial-type	Family
A	IPR033904	Trans-isoprenyl diphosphate synthases, head-to-head	Domain
A	IPR002060	Squalene/phytoene synthase	Family
A	IPR008949	Isoprenoid synthase domain superfamily	Homologous Superfamily
A	IPR017827	Hydroxysqualene synthase HpnC	Family

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 R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.