Carmen L Zayas

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The ability of archaea to salvage cobinamide has been under question because archaeal genomes lack orthologs to the bacterial nucleoside triphosphate:5'-deoxycobinamide kinase enzyme (cobU in Salmonella enterica). The latter activity is required for cobinamide salvaging in bacteria. This paper reports evidence that archaea salvage cobinamide from the(More)
Open reading frame (ORF) Mm2058 of the methanogenic archaeon Methanosarcina mazei strain Gö1 was shown in vivo and in vitro to encode the nonorthologous replacement of the alpha-ribazole-phosphate phosphatase (CobC; EC enzyme of Salmonella enterica serovar Typhimurium LT2. Bioinformatics analysis of sequences available in databases tentatively(More)
We report results of studies of the conversion of adenosylcobyric acid (AdoCby) to adenosylcobinamide-phosphate, the last step of the de novo corrin ring biosynthetic branch of the adenosylcobalamin (coenzyme B12) pathway of Salmonella enterica serovar Typhimurium LT2. Previous reports have implicated the CbiB protein in this step of the pathway. Hydropathy(More)
We report that cobC strains of Salmonella enterica serovar Typhimurium are impaired in the ability to salvage cobyric acid (Cby), a de novo corrin ring biosynthetic intermediate, under aerobic growth conditions. In vivo and in vitro evidence support the conclusion that this new phenotype of cobC strains is due to the inability of serovar Typhimurium to(More)
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