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Acetate kinase (AK) generally utilizes ATP as a phosphoryl donor, but AK from Entamoeba histolytica (PPi-ehiAK) uses pyrophosphate (PPi), not ATP, and is PPi-specific. The determinants of the phosphoryl donor specificity are unknown. Here, we inferred 5 candidate amino acid residues associated with this specificity, based on structural information. Each candidate residue in Escherichia coli ATP-specific...
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