4IS2

Crystal structure of the apo form of a 3alpha-hydroxysteroid dehydrogenase (BaiA2) associated with secondary bile acid synthesis from Clostridium scindens VPI12708 at 1.90 A resolution

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d4is2a_	Alpha and beta proteins (a/b)	NAD(P)-binding Rossmann-fold domains	NAD(P)-binding Rossmann-fold domains	automated matches	automated matches	([Clostridium] scindens ) [TaxId: 29347 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	SDR-like	8066868	3000038	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF00106	e4is2A1	A: a/b three-layered sandwiches	X: Rossmann-like	H: Rossmann-related	T: NAD(P)-binding Rossmann-fold domains	F: PF00106	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.720	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	NAD(P)-binding Rossmann-like Domain	CATH (4.3.0)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Bile acid 3-alpha hydroxysteroid dehydrogenase	NAD+ binding NAD binding binding nucleotide binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding heterocyclic compound binding small molecule binding oxidoreductase activity oxidoreductase activity, acting on the CH-OH group of donors, NAD or NADP as acceptor NAD+ binding NAD binding binding nucleotide binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding heterocyclic compound binding small molecule binding 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 catalytic activity bile acid binding organic acid binding carboxylic acid binding monocarboxylic acid binding 3alpha-hydroxy bile acid-CoA-ester 3-dehydrogenase activity steroid dehydrogenase activity steroid dehydrogenase activity, acting on the CH-OH group of donors, NAD or NADP as acceptor	oxoacid metabolic process cellular biosynthetic process organic hydroxy compound metabolic process steroid metabolic process lipid biosynthetic process organic acid biosynthetic process organic acid metabolic process carboxylic acid biosynthetic process organic substance metabolic process organic substance biosynthetic process small molecule metabolic process steroid biosynthetic process bile acid biosynthetic process monocarboxylic acid biosynthetic process oxoacid metabolic process cellular biosynthetic process organic hydroxy compound metabolic process steroid metabolic process lipid biosynthetic process organic acid biosynthetic process organic acid metabolic process carboxylic acid biosynthetic process organic substance metabolic process organic substance biosynthetic process small molecule metabolic process steroid biosynthetic process bile acid biosynthetic process monocarboxylic acid biosynthetic process small molecule biosynthetic process cellular metabolic process carboxylic acid metabolic process primary metabolic process organic cyclic compound metabolic process bile acid metabolic process biosynthetic process organic hydroxy compound biosynthetic process organic cyclic compound biosynthetic process metabolic process cellular process monocarboxylic acid metabolic process lipid metabolic process response to bile acid response to organic substance response to lipid response to stimulus response to chemical response to oxygen-containing compound response to organic cyclic compound protein-containing complex organization protein homotetramerization cellular component organization cellular component biogenesis cellular component assembly protein complex oligomerization protein tetramerization protein-containing complex assembly protein homooligomerization cellular component organization or biogenesis catabolic process organic acid catabolic process bile acid catabolic process cellular catabolic process monocarboxylic acid catabolic process carboxylic acid catabolic process small molecule catabolic process organic substance catabolic process	intracellular anatomical structure cytoplasm cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR002347	Short-chain dehydrogenase/reductase SDR	Family
A	IPR020904	Short-chain dehydrogenase/reductase, conserved site	Conserved Site
A	IPR036291	NAD(P)-binding domain superfamily	Homologous Superfamily

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.