Английская Википедия:5′-Phosphoribosylformylglycinamidine

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5′-Phosphoribosylformylglycinamidine (or FGAM) is a biochemical intermediate in the formation of purine nucleotides via inosine-5-monophosphate, and hence is a building block for DNA and RNA.[1][2] The vitamins thiamine[3][4] and cobalamin[5] also contain fragments derived from FGAM.[6]

The compound is biosynthesized from phosphoribosyl-N-formylglycineamide (FGAR) which is converted to an amidine by the action of phosphoribosylformylglycinamidine synthase (Шаблон:EC number), transferring an amino group from glutamine in a reaction that also requires ATP:

FGAR + ATP + glutamine + H2O → FGAM + ADP + glutamate + Pi

The biosynthesis pathway next converts FGAM to 5-aminoimidazole ribotide (AIR) by the action of AIR synthetase (Шаблон:EC number) which uses ATP to activate the terminal carbonyl group to attack by the nitrogen atom at the anomeric center:

FGAM + ATP → AIR + ADP + Pi + H+
Файл:AIR Synthetase.svg

See also

References

Шаблон:Reflist

Шаблон:Nucleotide metabolism intermediates