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Interconverting the catalytic activities of (betaalpha)(8)-barrel enzymes from different metabolic pathways: sequence requirements and molecular analysis.

Leopoldseder, Sonja ; Claren, Jörg ; Jürgens, Catharina ; Sterner, Reinhard


The (betaalpha)(8)-barrel enzymes N'-[(5'-phosphoribosyl)formimino]-5-aminoimidazole-4-carboxamide ribonucleotide isomerase (tHisA) and imidazole glycerol phosphate synthase (tHisF) from Thermotoga maritima catalyze two successive reactions in the biosynthesis of histidine. In both enzymes, aspartate residues at the C-terminal end of beta-strand 1 (Asp8 in tHisA and Asp11 in tHisF) and ...


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