PMID:26682
| Citation |
McCandliss, RJ, Poling, MD and Herrmann, KM (1978) 3-Deoxy-D-arabino-heptulosonate 7-phosphate synthase. Purification and molecular characterization of the phenylalanine-sensitive isoenzyme from Escherichia coli. J. Biol. Chem. 253:4259-65 |
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| Abstract |
The phenylalanine-sensitive 3-deoxy-D-arabino-heptulosonate 7-phosphate synthase (7-phospho-2-keto-3-deoxy-D-arabino-heptonate D-erythrose-4-phosphate lyase (pyruvate phosphorylating), EC 4.2.1.15) was purified to apparent homogeneity from extracts of Escherichia coli K12. The enzyme has a molecular weight of 140,000 as judged by gel filtration and sedimentation equilibrium analysis. The enzyme has a subunit molecular weight of 35,000 as determined by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate, suggesting that the native form of the enzyme is a tetramer. This was confirmed by cross-linking the enzyme with dimethylsuberimidate and by analyzing the cross-linked material by gel electrophoresis in the presence of sodium dodecyl sulfate. The enzyme shows a narrow pH optimum between pH 6.5 and 7.0. The enzyme is stable for several months when stored at -20 degrees C in buffers containing phosphoenolpyruvate. Removal of phosphoenolpyruvate causes an irreversible inactivation of the enzyme. The enzyme is strongly inhibited by L-phenylalanine and to a lesser degree by dihydrophenylalanine. Molecular parameters of the previously isolated tyrosine-sensitive 3-deoxy-D-arabino-heptulosonate 7-phosphate synthase from E. coli (Schoner, R., and Herrmann, K.M. (1976) J. Biol. Chem. 251, 5440-5447) are compared with those of the phenylalanine-sensitive isoenzyme from the same organism. |
| Links | |
| Keywords |
3-Deoxy-7-Phosphoheptulonate Synthase/isolation & purification; 3-Deoxy-7-Phosphoheptulonate Synthase/metabolism; Aldehyde-Lyases/isolation & purification; Amino Acids/analysis; Cobalt/pharmacology; Escherichia coli/enzymology; Isoenzymes/isolation & purification; Isoenzymes/metabolism; Kinetics; Macromolecular Substances; Molecular Weight; Phenylalanine/pharmacology |
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