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baiA1

Gene
baiA1
Protein
3alpha-hydroxy bile acid-CoA-ester 3-dehydrogenase 1/3
Organism
Clostridium scindens (strain JCM 10418 / VPI 12708)
Length
249 amino acids
Function
Involved in the multi-step bile acid 7alpha-dehydroxylation pathway that transforms primary bile acids to secondary bile acids in the human gut (PubMed:23836456, PubMed:16299351). Catalyzes the oxidation of C3-hydroxyl group of CoA conjugated bile acids generating a C3-oxo bile acid intermediate. Can use choloyl-CoA, chenodeoxycholoyl-CoA, deoxycholoyl-CoA, and lithocholoyl-CoA as substrates with similar efficiency. Highly prefers NAD over NADP as cosubstrate. Also catalyzes the reverse reactions; in vitro, the preferred direction of reaction depends on the pH. Has very little activity with unconjugated (non-CoA) bile acid substrates (PubMed:23836456).
Similarity
Belongs to the short-chain dehydrogenases/reductases (SDR) family.
Mass
26.658 kDa
Sequence
MKLVQDKITIITGGTRGIGFAAAKLFIENGAKVSIFGETQEEVDTALAQLKELYPEEEVLGFAPDLTSRDAVMAAVGTVAQKYGRLDVMINNAGITMNSVFSRVSEEDFKNIMDINVNGVFNGAWSAYQCMKDAKQGVIINTASVTGIYGSLSGIGYPTSKAGVIGLTHGLGREIIRKNIRVVGVAPGVVDTDMTKGLPPEILEDYLKTLPMKRMLKPEEIANVYLFLASDLASGITATTISVDGAYRP