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Acetate kinase, a member of the ASKHA (Acetate and Sugar Kinases, Hsp70, Actin) phosphotransferase superfamily is a central enzyme in prokaryotic carbon and energy metabolism. Recently extensive structural and biochemical studies of acetate kinase and related carboxylate kinases have been conducted. Analysis of the kinetic properties of wild-type and mutant enzymes has been impeded by the nature of...
The Escherichia coli Ppx protein is an exopolyphosphatase that degrades long-chain polyphosphates in a highly processive reaction. It also hydrolyzes the terminal 5′ phosphate of the modified nucleotide guanosine 5′ triphosphate 3′ diphosphate (pppGpp). The structure of Ppx has been determined to 1.9 Å resolution by X-ray crystallography. The exopolyphosphatase is an ASKHA (acetate and sugar kinases,...
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