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- W2209492429 abstract "1. Clear kinetic differences between cytoplasmic and mitochondrial forms of type-I cerebral hexokinase were demonstrated from experiments performed under identical conditions on three (cytoplasmic, bound mitochondrial and solubilized mitochondrial) preparations of the enzyme. 2. Whereas the Michaelis constant for glucose (KmGlc) was consistent, that for MgATP2- (KmATP) was lower in the cytoplasmic than in the two mitochondrial preparations. The substrate dissociation constants (KsGlc and KsATP) were both higher in the cytoplasmic than in the mitochondrial preparations. A further difference in the substrate kinetic patterns was that KmATP=KmATP for the cytoplasmic enzyme, in contrast with the mitochondrial enzyme, where KmATP was clearly not equal to KsATP [Bachelard et al. (1971) Biochem. J. 123, 707-715]. 3. Dead-end inhibition produced by N-acetyl-glucosamine and by AMP also exhibited different quantitative kinetic patterns for the two enzyme sources. Both inhibitions gave Ki values similar or equal to those of Ki' for the cytoplasmic activity, whereas Ki was clearly not equal to Ki' for the mitochondrial activity. 4. All of these studies demonstrated the similarity of the two mitochondrial activities (particulate and solubilized), which were both clearly different from the cytoplasmic activity. 5. The analysis gives a practical example of our previous theoretical treatment on the derivation of true inhibition constants. 6. The results are discussed in terms of the function of cerebral hexokinases." @default.
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- W2209492429 date "1977-03-01" @default.
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- W2209492429 title "Differences in catalytic properties between cerebral cytoplasmic and mitochondrial hexokinases" @default.
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- W2209492429 doi "https://doi.org/10.1042/bj1610593" @default.
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