The alpha-subunit of the E1 component of branched-chain 2-oxoacid dehydrogenase is phosphorylated at 3 sites by an endogenous kinase. Inactivation of the complex correlates with rapid phosphorylation of one of these sites. The similarities with the covalent regulation of pyruvate dehydrogenase complex are discussed.
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Cook et al. (1983) studied this question.
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