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Imidazole-3-glycerol phosphate synthase is a heterodimeric allosteric enzyme that catalyzes consecutive reactions in imidazole biosynthesis through its HisF and HisH subunits. The unusually slow unfolding reaction of the isolated HisF TIM barrel domain from the thermophilic bacteria, Thermotoga maritima, enabled an NMR-based site-specific analysis of the main-chain hydrogen bonds that stabilize its...
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