Title : Glutathione dependent modification of bovine lens aldose reductase.

Pub. Date : 1994 Apr

PMID : 7925685






9 Functional Relationships(s)
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1 Bovine lens aldose reductase (ALR2) is readily modified by glutathione disulphide (GSSG) to an enzyme form (GS-ALR2) exhibiting a reduced catalytic efficiency with all the substrates tested and a reduced susceptibility to inhibition. Glutathione Disulfide lens aldose reductase pseudogene Bos taurus
2 Bovine lens aldose reductase (ALR2) is readily modified by glutathione disulphide (GSSG) to an enzyme form (GS-ALR2) exhibiting a reduced catalytic efficiency with all the substrates tested and a reduced susceptibility to inhibition. Glutathione Disulfide lens aldose reductase pseudogene Bos taurus
3 By measuring the residual activity of ALR2 incubated in different glutathione redox buffers at 25 degrees C, an apparent redox equilibrium constant of 1.4 +/- 0.1 was evaluated. Glutathione lens aldose reductase pseudogene Bos taurus
4 Thus the rate and the maximal extent of ALR2 inactivation are proportional to the redox ratio of the thiol used as modifying agent (i.e. [GSH]/[GSSG]). Sulfhydryl Compounds lens aldose reductase pseudogene Bos taurus
5 Thus the rate and the maximal extent of ALR2 inactivation are proportional to the redox ratio of the thiol used as modifying agent (i.e. [GSH]/[GSSG]). Glutathione lens aldose reductase pseudogene Bos taurus
6 Thus the rate and the maximal extent of ALR2 inactivation are proportional to the redox ratio of the thiol used as modifying agent (i.e. [GSH]/[GSSG]). Glutathione Disulfide lens aldose reductase pseudogene Bos taurus
7 A reduced efficiency in the enzyme-cofactor binding following the GSSG dependent modification of ALR2, appears to be associated to the thiol accessibility of GS-ALR2 measured at different temperatures. Glutathione Disulfide lens aldose reductase pseudogene Bos taurus
8 A reduced efficiency in the enzyme-cofactor binding following the GSSG dependent modification of ALR2, appears to be associated to the thiol accessibility of GS-ALR2 measured at different temperatures. Sulfhydryl Compounds lens aldose reductase pseudogene Bos taurus
9 Besides being a general feature of protein reactivity in oxidative conditions, the glutathione-mediated ALR2 modification might be part of a cell strategy to preserve reducing power in conditions of oxidative stress. Glutathione lens aldose reductase pseudogene Bos taurus