Effect of alpha-ketoglutarate and its structural analogues on hysteretic properties of alpha-ketoglutarate dehydrogenase.
The burst of product accumulation during the KGD reaction was investigated. It has been shown not to be the obligatory feature of catalysis, but appears when increasing the enzyme saturation by KG. Structural analogues of KG and the SH-group modification suppress the initial burst without preventing catalysis. The results obtained are in favour of the existence of the regulatory site for binding KG and its structural analogues essential for hysteretic properties of KGD.
Bunik
V I
VI
Department of Biochemistry, Moscow State University, USSR.
Romash
O G
OG
Gomazkova
V S
VS
D000818:Animals; D010856:Columbidae; D006902:Hydroxymercuribenzoates / Q000494:pharmacology; D066298:In Vitro Techniques; D007655:Ketoglutarate Dehydrogenase Complex / Q000037:antagonists & inhibitors / Q000378:metabolism*; D007656:Ketoglutaric Acids / Q000378:metabolism*; D007700:Kinetics; D008314:Malonates / Q000494:pharmacology; D010071:Oxaloacetates / Q000494:pharmacology; D010084:Oxidation-Reduction; D013386:Succinates / Q000494:pharmacology; D019802:Succinic Acid
D006902:Hydroxymercuribenzoates; D007656:Ketoglutaric Acids; D008314:Malonates; D010071:Oxaloacetates; D013386:Succinates; C030601:4-hydroxymercuribenzoate; C030290:malonic acid; D019802:Succinic Acid; D007655:Ketoglutarate Dehydrogenase Complex