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HisA and TrpF catalyse similar reactions. HisA and TrpF catalyse analogous Amadori rearrangements of N′-[(5′-phosphoribosyl)formimino]-5-aminoimidazole-4-carboxamide ribonucleotide (ProFAR) and N′-(5′-phosphoribosyl)anthranilate (PRA) into N′-[(5′-phosphoribulosyl)formimino]-5-aminoimidazole-4-carboxamide (PRFAR) and 1-[(2-carboxyphenyl)amino]-1-deoxyribulose 5-phosphate (CDRP), respectively. Red 'R's indicate the different side-chains in the two substrates.
