PMID: 6409095May 1, 1983Paper

Wild-type and mutant forms of the pyruvate dehydrogenase multienzyme complex from Bacillus subtilis

The Biochemical Journal
J A HodgsonR N Perham

Abstract

A simple procedure is described for the purification of the pyruvate dehydrogenase complex and dihydrolipoamide dehydrogenase from Bacillus subtilis. The method is rapid and applicable to small quantities of bacterial cells. The purified pyruvate dehydrogenase complex (s0(20),w = 73S) comprises multiple copies of four different types of polypeptide chain, with apparent Mr values of 59 500, 55 000, 42 500 and 36 000: these were identified as the polypeptide chains of the lipoate acetyltransferase (E2), dihydrolipoamide dehydrogenase (E3) and the two types of subunit of the pyruvate decarboxylase (E1) components respectively. Pyruvate dehydrogenase complexes were also purified from two ace (acetate-requiring) mutants of B. subtilis. That from mutant 61142 was found to be inactive, owing to an inactive E1 component, which was bound less tightly than wild-type E1 and was gradually lost from the E2E3 subcomplex during purification. Subunit-exchange experiments demonstrated that the E2E3 subcomplex retained full enzymic activity, suggesting that the lesion was limited to the E1 component. Mutant 61141R elaborated a functional pyruvate dehydrogenase complex, but this also contained a defective E1 component, the Km for pyruvate being r...Continue Reading

Citations

Jan 19, 1999·Annual Review of Microbiology·M M Nakano, P Zuber
Jun 15, 2007·Critical Reviews in Microbiology·Zijun Xiao, Ping Xu
Jun 1, 1985·Microbiological Reviews·P J Piggot, J A Hoch

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