0 0—PocH2O、H MP_O—POCH,O、H HH OH PRPP synthetase H 0-P-0-P-0 HO OH HO OH O Ribose 5-phosphate 5-Phosphoribosyl-1-pyrophosphate (PRPP) PRPP is synthesized from ribose 5-P in a Reaction catalyzed by prpp synthetasePRPP is synthesized from ribose 5-P in a Reaction catalyzed by PRPP synthetase