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- W1974913328 abstract "The phenomenon of paracatalytic inactivation has been demonstrated and characterized with the pig heart pyruvate dehydrogenase complex. The enzyme became progressively inactive when it was preincubated in the presence of pyruvate, thiamine pyrophosphate, and extrinsic oxidative agent, 2,6-dichloroindophenol. Not only the overall reaction of enzyme complex but the individual reactions catalyzed by enzyme components, pyruvate dehydrogenase, and dihydrolipoamide acetyltrasferase, were reduced after preincubation. The observed inactivation is due to two factors: (i) covalent incorporation of the pyruvate atoms, and (ii) formation of a thiamine pyrophosphate analog. (i) A covalent incorporation of radioactivity from [2-14C]pyruvate into the enzyme complex, which was proportional to the inhibition of overall reaction was observed. Seventy-eight percent of the radioactivity incorporated into the dihydrolipoamide transacetylase but not into the lipoic acid. Thus, modification of the dihydrolipoamide acetyltransferase component can be attributed to the covalent incorporation of pyruvate atoms. (ii) During inactivation, the enzyme-bound thiamine pyrophosphate underwent a modification resulting in the formation of a thiamine pyrophosphate analog, presumably thiamine thiazolone pyrophosphate, which inhibited exclusively the pyruvate dehydrogenase component." @default.
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- W1974913328 date "1983-06-01" @default.
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- W1974913328 title "Paracatalytic inactivation of pig heart pyruvate dehydrogenase complex" @default.
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- W1974913328 doi "https://doi.org/10.1016/0003-9861(83)90605-7" @default.
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