
The two forms of pyruvate kinase (ATP:pyruvate 2-O-phosphotransferase, EC 2.7.1.40) present in Escherichia coli have been purified from the same cultures and crystallized. A modified procedure for the purification of type I pyruvate kinase is described. Molecular weight, subunit structure, amino acid composition, NH2-terminal amino acid, maps of tryptic peptides and conditions for crystallization have been determined for the two forms. A comparison of these data shows that the two forms are different proteins, each being a tetramer of identical subunits.
570, isoenzymes, Macromolecular Substances, Pyruvate Kinase, E. coli, Molecular Weight, Escherichia coli, Electrophoresis, Polyacrylamide Gel, Trypsin, Amino Acids, Crystallization, Pyruvate kinase
570, isoenzymes, Macromolecular Substances, Pyruvate Kinase, E. coli, Molecular Weight, Escherichia coli, Electrophoresis, Polyacrylamide Gel, Trypsin, Amino Acids, Crystallization, Pyruvate kinase
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