cobyrinate a,c-diamide synthase EC#: 6.3.5.11; ChemWhat Code: 1383870

Product Name cobyrinate a,c-diamide synthase
Example Structure Example Structure of cobyrinate a,c-diamide synthase EC#: 6.3.5.11
Synonyms CbiA, CobB
EC Number 6.3.5.11
CAS Registry Number
Comments This enzyme is the first glutamine amidotransferase that participates in the anaerobic (early cobalt insertion) biosynthetic pathway of adenosylcobalamin, and catalyses the ATP-dependent synthesis of cobyrinate?a,c-diamide from cobyrinate using either?L-glutamine or ammonia as the nitrogen source. It is proposed that the enzyme first catalyses the amidation of the?c-carboxylate, and then the intermediate is released into solution and binds to the same catalytic site for the amidation of the?a-carboxylate. The?Km?for ammonia is substantially higher than that for?L-glutamine.
Cofactor
History
Reactions 2 Atp + cobyrinate + 2 L-glutamine + 2 H(2)O = 2 adp + 2 phosphate + cobyrinate a,c-diamide + 2 L-glutamate.

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