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5-Aminoimidazole-4-carboxamide ribonucleotide (ZMP) and N-(beta-D-ribofuranosyl)formamide 5'-phosphate (FAR-P) have been identified as products of the metabolism of ATP and 5-phospho-alpha-D-ribosyl diphosphate by Methanobacterium thermoautotrophicum delta(H), a member of the domain Archaea. Evidence indicates that the first three steps in the pathway to the formation of these compounds are the same as the first three steps of histidine biosynthesis and lead to the generation of pro-phosphoribosyl formimino-5-aminoimidazole-4-carboxamide ribonucleotide (5'-proFAR). The 5'-proFAR then undergoes hydrolysis to ZMP and FAR-P. The reaction was detected by an unexpected high concentration of ZMP in cell extracts of M. thermoautotrophicum delta(H).

journal of bacteriology

Occurrence and biosynthesis of 5-aminoimidazole-4-carboxamide ribonucleotide and N-(beta-D-ribofuranosyl)formamide 5'-phosphate in Methanobacterium thermoautotrophicum delta(H)