Annotations: 3QAU

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	HMG-CoA_reductase_classII	e3qauA2	A: alpha arrays	X: RuvA-C	H: HMG-CoA reductase flap domain (From Topology)	T: HMG-CoA reductase flap domain	F: HMG-CoA_reductase_classII	ECOD (1.6)
A	HMG-CoA_red_2nd	e3qauA1	A: a+b two layers	X: Alpha-beta plaits	H: HMG-CoA reductase	T: NAD-binding domain of HMG-CoA reductase	F: HMG-CoA_red_2nd	ECOD (1.6)
A	HMG-CoA_red_1st	e3qauA3	A: a+b two layers	X: Alpha-beta plaits	H: HMG-CoA reductase	T: Substrate-binding domain of HMG-CoA reductase	F: HMG-CoA_red_1st	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.90.770.10	Alpha Beta	Alpha-Beta Complex	3-hydroxy-3-methylglutaryl-coenzyme A Reductase	Chain A, domain 2	CATH (4.3.0)
A	3.30.70.420	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	Hydroxymethylglutaryl-CoA reductase, class I/II, NAD/NADP-binding domain	CATH (4.3.0)
A	1.10.8.660	Mainly Alpha	Orthogonal Bundle	Helicase, Ruva Protein	domain 3	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00368	Hydroxymethylglutaryl-coenzyme A reductase (HMG-CoA_red)	Hydroxymethylglutaryl-coenzyme A reductase	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	3-hydroxy-3-methylglutaryl-coenzyme a reductase	oxidoreductase activity oxidoreductase activity, acting on the CH-OH group of donors, NAD or NADP as acceptor oxidoreductase activity, acting on CH-OH group of donors hydroxymethylglutaryl-CoA reductase (NADPH) activity catalytic activity hydroxymethylglutaryl-CoA reductase (NADH) activity binding nucleoside phosphate binding organic cyclic compound binding nucleotide binding heterocyclic compound binding small molecule binding	nucleoside phosphate metabolic process cellular metabolic process primary metabolic process purine-containing compound metabolic process nucleobase-containing compound metabolic process organophosphate metabolic process nucleobase-containing small molecule metabolic process phosphate-containing compound metabolic process metabolic process sulfur compound metabolic process cellular process small molecule metabolic process amide metabolic process phosphorus metabolic process nucleoside phosphate metabolic process cellular metabolic process primary metabolic process purine-containing compound metabolic process nucleobase-containing compound metabolic process organophosphate metabolic process nucleobase-containing small molecule metabolic process phosphate-containing compound metabolic process metabolic process sulfur compound metabolic process cellular process small molecule metabolic process amide metabolic process phosphorus metabolic process coenzyme A metabolic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR009029	Hydroxymethylglutaryl-CoA reductase, class I/II, substrate-binding domain superfamily	Homologous Superfamily
A	IPR023074	Hydroxymethylglutaryl-CoA reductase, class I/II, catalytic domain superfamily	Homologous Superfamily
A	IPR009023	Hydroxymethylglutaryl-CoA reductase, class I/II, NAD/NADP-binding domain superfamily	Homologous Superfamily
A	IPR002202	Hydroxymethylglutaryl-CoA reductase, class I/II	Family
A	IPR004553	Hydroxymethylglutaryl-CoA reductase, bacterial-type	Family
A	IPR023076	Hydroxymethylglutaryl-CoA reductase, class I/II, conserved site	Conserved Site

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.