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- W2100082305 abstract "The role of cbiK, a gene found encoded within the Salmonella typhimurium cob operon, has been investigated by studying its in vivo function in Escherichia coli. First, it was found that cbiK is not required for cobalamin biosynthesis in the presence of a genomic cysG gene (encoding siroheme synthase) background. Second, in the absence of a genomic cysG gene, cobalamin biosynthesis in E. coli was found to be dependent upon the presence of cobA(P. denitrificans) (encoding the uroporphyrinogen III methyltransferase from Pseudomonas denitrificans) and cbiK. Third, complementation of the cysteine auxotrophy of the E. coli cysG deletion strain 302delta a could be attained by the combined presence of cobA(P. denitrificans) and the S. typhimurium cbiK gene. Collectively these results suggest that CbiK can function in fashion analogous to that of the N-terminal domain of CysG (CysG(B)), which catalyzes the final two steps in siroheme synthesis, i.e., NAD-dependent dehydrogenation of precorrin-2 to sirohydrochlorin and ferrochelation. Thus, phenotypically CysG(B) and CbiK have very similar properties in vivo, although the two proteins do not have any sequence similarity. In comparison to CysG, CbiK appears to have a greater affinity for Co2+ than for Fe2+, and it is likely that cbiK encodes an enzyme whose primary role is that of a cobalt chelatase in corrin biosynthesis." @default.
- W2100082305 created "2016-06-24" @default.
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- W2100082305 date "1997-05-01" @default.
- W2100082305 modified "2023-10-03" @default.
- W2100082305 title "A role for Salmonella typhimurium cbiK in cobalamin (vitamin B12) and siroheme biosynthesis" @default.
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- W2100082305 doi "https://doi.org/10.1128/jb.179.10.3202-3212.1997" @default.
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