ID 6.3.4.23 DE formate--phosphoribosylaminoimidazolecarboxamide ligase. AN 5-formaminoimidazole-4-carboxamide-1-beta-D-ribofuranosyl AN 5'-monophosphate synthetase. AN 5-formaminoimidazole-4-carboxamide ribonucleotide synthetase. CA 5-amino-1-(5-phospho-beta-D-ribosyl)imidazole-4-carboxamide + ATP + CA formate = 5-formamido-1-(5-phospho-D-ribosyl)imidazole-4-carboxamide + CA ADP + phosphate. CC -!- This archaeal enzyme, characterized from the methanogen CC Methanocaldococcus jannaschii, catalyzes a step in the synthesis of CC purine nucleotides. CC -!- It differs from the orthologous bacterial/eukaryotic enzymes, which CC utilize 10-formyltetrahydrofolate rather than formate and ATP. cf. CC EC 2.1.2.3. DR Q8PWT3, PURP1_METMA; Q8PT10, PURP2_METMA; O30123, PURP_ARCFU ; DR A8M9J5, PURP_CALMQ ; A0RU67, PURP_CENSY ; A8A9M3, PURP_IGNH4 ; DR B1L3X7, PURP_KORCO ; A6UWN1, PURP_META3 ; Q8TU67, PURP_METAC ; DR Q0W2C6, PURP_METAR ; Q46CU6, PURP_METBF ; Q12VJ6, PURP_METBU ; DR Q57600, PURP_METJA ; Q8TXS2, PURP_METKA ; A4FWE6, PURP_METM5 ; DR A9A9U0, PURP_METM6 ; A6VGV9, PURP_METM7 ; Q6LXH8, PURP_METMP ; DR A5UKI3, PURP_METS3 ; A4YCP2, PURP_METS5 ; Q2NHH7, PURP_METST ; DR O27269, PURP_METTH ; A0B5K9, PURP_METTP ; P14027, PURP_METVS ; DR A9A1D3, PURP_NITMS ; Q9V0I8, PURP_PYRAB ; Q8ZYV1, PURP_PYRAE ; DR A4WN42, PURP_PYRAR ; A3MTB5, PURP_PYRCJ ; Q8U0R7, PURP_PYRFU ; DR O59073, PURP_PYRHO ; A1RQP5, PURP_PYRIL ; B1YBN2, PURP_PYRNV ; DR Q980P7, PURP_SACS2 ; Q4JAU3, PURP_SULAC ; Q975Y9, PURP_SULTO ; DR Q5JFL8, PURP_THEKO ; //