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Information on EC - 3beta-hydroxysteroid-4beta-carboxylate 3-dehydrogenase (decarboxylating)

for references in articles please use BRENDA:EC1.1.1.417
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IUBMB Comments
This bacterial enzyme participates in the biosynthesis of bacterial sterols. Together with EC, 4beta-methylsterol monooxygenase (SdmA) it forms an enzyme system that removes one methyl group from the C-4 position of 4,4-dimethylated steroid molecules. SdmA catalyses three successive oxidations of the C-4beta methyl group, turning it into a carboxylate group; SdmB is a bifunctional enzyme that catalyses two different activities. As EC it catalyses an oxidative decarboxylation that results in reduction of the 3beta-hydroxy group at the C-3 carbon to an oxo group. As EC, 3beta-hydroxysteroid 3-dehydrogenase, it reduces the 3-oxo group back to a 3beta-hydroxyl. Since the remaining methyl group at C-4 is in an alpha orientation, it cannot serve as a substrate for a second round of demethylation by this system.
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The expected taxonomic range for this enzyme is: Methylococcus capsulatus
sdmB, more
a 3beta-hydroxy-4alpha-methylsteroid-4beta-carboxylate + NAD(P)+ = a 4alpha-methyl-3-oxosteroid + NAD(P)H + CO2 + H+
show the reaction diagram
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