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Imidazole glycerol phosphate synthase from Thermotoga maritima. Quaternary structure, steady-state kinetics, and reaction mechanism of the bienzyme complex.

Beismann-Driemeyer, Silke ; Sterner, Reinhard


Imidazole glycerol phosphate synthase, which links histidine and de novo purine biosynthesis, is a member of the glutamine amidotransferase family. In bacteria, imidazole glycerol phosphate synthase constitutes a bienzyme complex of the glutaminase subunit HisH and the synthase subunit HisF. Nascent ammonia produced by HisH reacts at the active site of HisF with ...


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