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.
The expected taxonomic range for this enzyme is: Archaea, Bacteria
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SYSTEMATIC NAME
IUBMB Comments
cobalt-precorrin 5A acylhydrolase
This enzyme hydrolyses the ring A acetate delta-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.
analysis of the cobalamin biosynthetic operon cob. Bacillus megaterium synthesizes cobalamin by an anaerobic pathway, in which cobalt is added at an early stage and molecular oxygen is not required
CbiG is the gene product responsible for the opening of the ring A delta-lactone and extrusion of the C2 unit. The anaerobic biosynthetic pathway features internal delivery of oxygen from a carboxylic acid terminus to C-20 followed by extrusion of the C2 unit as acetaldehyde, using cobalt complexes as substrates
co-expression of the cobA gene from Propionibacterium freudenreichii and the cbiA, -C, -D, -E, -T, -F, -G, -H, -J, -K, -L, and -P genes from Salmonella enterica serovar typhimurium in Escherichia coli result in the production of cobyrinic acid a,c-diamide
synthesis of cobalt corrinoid intermediates cobalt-precorrin 5A and cobalt-precorrin 5B, with the aid of overexpressed enzymes of the vitamin B12 pathway of Salmonella enterica serovar typhimurium
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
Genetically engineered production of 1-desmethylcobyrinic acid, 1-desmethylcobyrinic acid a,c-diamide, and cobyrinic acid a,c-diamide in Escherichia coli implies a role for CbiD in C-1 methylation in the anaerobic pathway to cobalamin
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