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EC 2.7.1.156 Details
EC number
2.7.1.156
Accepted name
adenosylcobinamide kinase
Reaction
RTP + adenosylcobinamide = adenosylcobinamide phosphate + RDP [where RTP is either ATP or GTP (for symbol definitions, click here)]
Other name(s)
CobU, adenosylcobinamide kinase/adenosylcobinamide-phosphate guanylyltransferase, AdoCbi kinase/AdoCbi-phosphate guanylyltransferase
Systematic name
RTP:adenosylcobinamide phosphotransferase
CAS registry number
169592-51-2
Comment
In Salmonella typhimurium LT2, under anaerobic conditions, CobU (EC 2.7.7.62 and EC 2.7.1.156), CobT (EC 2.4.2.21), CobC (EC 3.1.3.73) and CobS (EC 2.7.8.26) 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 nucleotide loop assembly pathway is the cobinamide (Cbi) activation branch where AdoCbi or adenosylcobinamide-phosphate is converted to the activated intermediate AdoCbi-GDP by Cob U. The final step in adenosylcobalamin biosynthesis is the condensation of AdoCbi-GDP with α-ribazole, which is catalysed by EC 2.7.8.26, adenosylcobinamide-GDP ribazoletransferase (CobS), to yield adenosylcobalamin. CobU is a bifunctional enzyme that has both kinase (EC 2.7.1.156) and guanylyltransferase (EC 2.7.7.62, adenosylcobinamide-phosphate guanylyltransferase) 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 [4].
History
created 2004
EC Tree
2.7.1.9 created 1961, deleted 1965
2.7.1.57 created 1972, deleted 1984
2.7.1.70 created 1972, deleted 2004
2.7.1.75 created 1972, deleted 1976
2.7.1.96 created 1978, deleted 1978
2.7.1.97 created 1978, deleted 1992
2.7.1.98 created 1978, deleted 1984
2.7.1.111 created 1984, deleted 1992
2.7.1.133 created 1990, deleted 2002
2.7.1.139 created 1992, deleted 2002
2.7.1.152 created 2002, deleted 2003