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A 13.1-kb DNA fragment carrying Pseudomonas denitrificans cob genes has been sequenced. The nucleotide sequence and genetic analysis revealed that this fragment contained five different cob genes named cobN to cobQ and cobW. Based on the similarity of NH2-terminal sequences and molecular weights of the purified Cob proteins, CobQ was identified as cobyric acid synthase, CobP was identified as a bifunctional enzyme exhibiting both cobinamide kinase and cobinamide phosphate guanylyltransferase activities, and CobO was identified as cob(I)alamin adenosyltransferase. CobN is proposed to play a role in cobalt insertion reactions. Four other open reading frames were identified on the 13.1-kb fragment, but their chromosomal inactivation did not lead to a cobalamin-minus phenotype.

journal of bacteriology

Nucleotide sequence and genetic analysis of a 13.1-kilobase-pair Pseudomonas denitrificans DNA fragment containing five cob genes and identification of structural genes encoding Cob(I)alamin adenosyltransferase, cobyric acid synthase, and bifunctional cobinamide kinase-cobinamide phosphate guanylyltransferase