The Enzyme Database

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Accepted name: cobalt-precorrin 5A hydrolase
Reaction: cobalt-precorrin-5A + H2O = cobalt-precorrin-5B + acetaldehyde + 2 H+
For diagram of anaerobic corrin biosynthesis (part 1), click here
Other name(s): CbiG
Systematic name: cobalt-precorrin 5A acylhydrolase
Comments: This enzyme hydrolyses the ring A acetate δ-lactone of cobalt-precorrin-5A resulting in the loss of the C-20 carbon and its attached methyl group in the form of acetaldehyde. This is a key reaction in the contraction of the porphyrin-type tetrapyrrole ring and its conversion to a corrin ring in the anaerobic (early cobalt insertion) adenosylcobalamin biosynthesis pathway.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
1.  Kajiwara, Y., Santander, P.J., Roessner, C.A., Perez, L.M. and Scott, A.I. Genetically engineered synthesis and structural characterization of cobalt-precorrin 5A and -5B, two new intermediates on the anaerobic pathway to vitamin B12: definition of the roles of the CbiF and CbiG enzymes. J. Am. Chem. Soc. 128 (2006) 9971–9978. [DOI] [PMID: 16866557]
2.  Moore, S.J., Lawrence, A.D., Biedendieck, R., Deery, E., Frank, S., Howard, M.J., Rigby, S.E. and Warren, M.J. Elucidation of the anaerobic pathway for the corrin component of cobalamin (vitamin B12). Proc. Natl. Acad. Sci. USA 110 (2013) 14906–14911. [DOI] [PMID: 23922391]
[EC created 2010]

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