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- W1604298182 abstract "ADP3- and ADPMg caused mixed inhibition of purified yeast hexokinase isoenzymes and ascites tumor hexokinases I and II when ATPMg is the varied substrate. Since exchange between ADPMg and ATPMg is observed under steady state conditions in which free glucose-6-P is not available for reaction, the effect of ADPMg on Vmax must result from its reaction at the ADP product site of the enzyme· glucose-6-P complex. Thus, this type of inhibition, which is rare among the kinases, is attributed to a relatively slow release of the second product, glucose-6-P. In the case of yeast hexokinase, the replot of the intercepts of the 1/V against 1/ATPMg plot as a function of ADPMg concentration is hyperbolic. Thus, the alternative sequence of product release, glucose-6-P first, is occurring; however, this sequence is probably of minor significance except in the presence of high concentrations of ADPMg. Under certain conditions, mixed inhibition can be observed by glucose-6-P with ATPMg or ITPMg, the variable substrate. In no case was exchange observed between glucose-6-32P and ATPMg under product-inhibited steady state conditions in which free ADP was kept low by a suitable trapping reaction. This indicates that any inhibition of Vmax by glucose-6-P is not due to action at the glucose-6-P product site of an enzyme·ADP complex which would have to dissociate rapidly, but to action at a particular modifier site. Such a site is therefore indicated for tumor hexokinase II. A simple general kinetic procedure is described for evaluating the inhibition due to ADP3- when other inhibitors such as ADPMg and ATP4- are also present." @default.
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- W1604298182 date "1970-01-01" @default.
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- W1604298182 title "Product Inhibition of the Hexokinases" @default.
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- W1604298182 doi "https://doi.org/10.1016/s0021-9258(18)63439-8" @default.
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