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- W1656906723 abstract "Abstract The adenine nucleotide analog [3H]pyridoxal 5'-diphospho-5'-adenosine (PLP-AMP) is a potent and highly specific inactivator of yeast 3-phosphoglycerate kinase. Supportive evidence includes the finding that 1) during a 10-min incubation, half-maximal inactivation is given by 10 microM PLP-AMP, 2) covalent incorporation of 1.2 mol of PLP-AMP/mol of enzyme is sufficient to give complete inactivation, and 3) MgATP gives near complete protection against modification and inactivation by PLP-AMP. Following reaction with PLP-AMP and reduction with NaBH4 to form a stable adduct, the enzyme was digested with endoproteinase Lys-C and peptides were separated by reversed-phase high-performance liquid chromatography. The single major labeled peptide was purified and sequenced, and the modified residue was identified as Lys-131. The crystal structure of enzyme in the open conformation shows Lys-131 to reside within a loop of flexible random coil positioned at the outer edge of the central binding cleft, approximately 2 nm from the surface of the cleft that comprises part of the MgATP-binding site (Watson, H. C., Walker, N. P. C., Shaw, P. J., Bryant, T. N., Wendell, P. L., Fothergill, L. A., Perkins, R. E., Conroy, S. C., Dobson, M. J., Tuite, M. F., Kingsman, A. J., and Kingsman, S. M. (1982) EMBO J. 1, 1635-1640). We conclude that the structural element containing Lys-131 undergoes substantial movement during the ligand-induced conformational change known to occur during formation of the ternary complex, resulting in the positioning of a basic residue near a negatively charged substrate. Since similar affinity-labeling results have been presented for hexokinase (Tamura, J. K., LaDine, J. R., and Cross, R. L. (1988) J. Biol. Chem. 263, 7907-7912), we further suggest that movement of positive charge into the central cleft may be a common step in the tight binding of nucleotides by bilobal kinases." @default.
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- W1656906723 date "1991-04-01" @default.
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- W1656906723 title "The adenine nucleotide-binding site on yeast 3-phosphoglycerate kinase. Affinity labeling of Lys-131 by pyridoxal 5‘-diphospho-5‘-adenosine." @default.
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- W1656906723 doi "https://doi.org/10.1016/s0021-9258(20)89629-x" @default.
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