||In Salmonella typhimurium LT2, under anaerobic conditions, CobU (EC 126.96.36.199 and EC 188.8.131.52), CobT (EC 184.108.40.206), CobC (EC 220.127.116.11) and CobS (EC 18.104.22.168) catalyse reactions in the nucleotide loop assembly pathway, which convert adenosylcobinamide (AdoCbi) into adenosylcobalamin (AdoCbl). CobT and CobC are involved in 5,6-dimethylbenzimidazole activation whereby 5,6-dimethylbenzimidazole is converted to its riboside, α-ribazole. The second branch of the nuclotide loop assembly pathway is the cobinamide (Cbi) activation branch where AdoCbi or adenosylcobinamide-phosphate is converted to the activated intermediate AdoCbi-GDP by the bifunctional enzyme Cob U. The final step in adenosylcobalamin biosynthesis is the condensation of AdoCbi-GDP with α-ribazole, which is catalysed by EC 22.214.171.124, cobalamin synthase (CobS), to yield adenosylcobalamin. CobU is a bifunctional enzyme that has both kinase (EC 126.96.36.199) and guanylyltransferase (EC 188.8.131.52) activities. However, both activities are not required at all times.The kinase activity has been proposed to function only when S. typhimurium is assimilating cobinamide whereas the guanylyltransferase activity is required for both assimilation of exogenous cobinamide and for de novo synthesis of adenosylcobalamin . The guanylyltransferase reaction is a two-stage reaction with formation of a CobU-GMP intermediate . Guanylylation takes place at histidine-46.
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||Thompson, T.B., Thomas, M.G., Escalante-Semerena, J.C. and Rayment, I. Three-dimensional structure of adenosylcobinamide kinase/adenosylcobinamide phosphate guanylyltransferase from Salmonella typhimurium determined to 2.3 Å resolution. Biochemistry 37 (1998) 7686–7695. [PMID: 9601028]
||Thompson, T.B., Thomas, M.G., Escalante-Semerena, J.C. and Rayment, I. Three-dimensional structure of adenosylcobinamide kinase/adenosylcobinamide phosphate guanylyltransferase (CobU) complexed with GMP: evidence for a substrate-induced transferase active site. Biochemistry 38 (1999) 12995–13005. [PMID: 10529169]
||Thomas, M.G., Thompson, T.B., Rayment, I. and Escalante-Semerena, J.C. Analysis of the adenosylcobinamide kinase/adenosylcobinamide-phosphate guanylyltransferase (CobU) enzyme of Salmonella typhimurium LT2. Identification of residue His-46 as the site of guanylylation. J. Biol. Chem. 275 (2000) 27576–27586. [PMID: 10869342]
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