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Kinetic studies of the reaction mechanism of rat liver phosphoglycerate kinase in the direction of ADP utilization.

Authors: Lavoinne, A  Marchand, JC  Chedeville, A  Matray, F 
Citation: Lavoinne A, etal., Biochimie. 1983 Mar;65(3):211-20.
Pubmed: (View Article at PubMed) PMID:6405813

The kinetic properties of rat liver phosphoglycerate kinase were investigated in the forward direction of the reaction (utilization of ADP). The kinetic studies were performed in an assay system using combined hexokinase/glucose-6-phosphate dehydrogenase as an ATP trap. The Km values for Mg ADP1- and 1,3-diphospho-D-glycerate were approximately 0.11 and 0.006 mM, respectively. Reciprocal plots of 1/v versus 1/ (Mg ADP1-) at different fixed concentrations of 1,3-diphospho-D-glycerate and 1/v versus 1/ (1,3-diphospho-D-glycerate) at different fixed concentrations of Mg ADP1- were apparently parallel. However, product inhibition studies (3-phospho-D-glycerate), dead-end inhibition studies (2,3-diphospho-D-glycerate), and adenosine and AMP inhibition patterns yielded results consistent with a rapid equilibrium random mechanism in which the binding of one substrate greatly decreases the affinity of the enzyme for the second substrate. Existence of two sites for 3-phospho-D-glycerate is suggested.

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RGD Object Information
RGD ID: 2302859
Created: 2009-01-19
Species: All species
Last Modified: 2009-01-19
Status: ACTIVE



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