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CobA-type ATP:corrinoid adenosyltransferase CobA-ATP:corrinoid adenosyltransferase is one of three sequence and structurally unrelated groups of ATP:corrinoid adenosyltransferase, PduO and EutT being the other two. CobA has been shown to be involved in cobalamin (vitamin B12) biosynthesis and scavenging of incomplete corrinoids. This enzyme is a homodimer, which catalyzes the adenosylation reaction: ATP + cob(I)alamin + H2O
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