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- W2020103336 abstract "The kinetic mechanism of rat muscle adenylosuccinate synthetase was studied by determining the rates of isotope exchange at equilibrium. A random sequential binding mechanism was indicated for both the forward and reverse reactions. Aspartate, adenylosuccinate, GDP, and Pi were determined to bind in rapid equilibrium. GTP exchanges with both GDP and Pi at the same rate, which is similar to the exchange rate of IMP with adenylosuccinate. Aspartate exchanges with adenylosuccinate at a higher rate than does IMP over the range of concentrations tested. The slower IMP and GTP exchange rates suggest a forward binding mechanism containing a preferred path in which the quaternary complex is most often formed by aspartate binding to the E-GTP-IMP complex. This preferred path is consistent with an interaction between IMP and GTP in the absence of aspartate as determined by isotope scrambling experiments [Bass, M. B., Fromm, H. J., & Rudolph, F. B. (1984) J. Biol. Chem. 259, 12330-12333]. However, the products of such an interaction are tightly bound to the enzyme as no partial exchange reactions between adenylosuccinate and aspartate in the presence or absence of Pi were detected." @default.
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- W2020103336 date "1986-11-18" @default.
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- W2020103336 title "Isotope exchange at equilibrium studies with rat muscle adenylosuccinate synthetase" @default.
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- W2020103336 doi "https://doi.org/10.1021/bi00371a013" @default.
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