[The effect of modification of lactate and malate dehydrogenases on their stability and activity].
The inactivation of lactate and malate dehydrogenases (LDH and MDH) modified by progesterone in the water-dimethylformamide (DMF) medium is described by the first-order equation up to large conversion degrees. The MDH modification is accompanied by the increase of its stability by 7-14%, while LDH modification leads to the enzyme stability decrease by 67%. The enzymes catalytic activities are changed simultaneously. The main factors of the stability and activity changes are the DMF influence upon the quaternary structure of the proteins at the modification and a hydrofobization of the external and internal protein sites by progesterone.
Markina
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Eremin
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D000818:Animals; D002384:Catalysis; D004126:Dimethylformamide / Q000494:pharmacology; D004795:Enzyme Stability; D066298:In Vitro Techniques; D007700:Kinetics; D007770:L-Lactate Dehydrogenase / Q000037:antagonists & inhibitors / Q000378:metabolism*; D008291:Malate Dehydrogenase / Q000037:antagonists & inhibitors / Q000378:metabolism*; D008929:Mitochondria, Heart / Q000201:enzymology*; D011374:Progesterone / Q000494:pharmacology; D011487:Protein Conformation; D012996:Solutions; D013552:Swine; D013696:Temperature
D012996:Solutions; D011374:Progesterone; D004126:Dimethylformamide; D007770:L-Lactate Dehydrogenase; D008291:Malate Dehydrogenase
Vliianie modifitsirovaniia laktat- i malatdegidrogenaz na ikh stabil'nost' i aktivnost'.