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- W1963804963 abstract "The pyruvate dehydrogenase complex of Escherichia coli was isolated in a simple three-step procedure. Its chain stoichiometry, determined by trinitrobenzoate modification was found to be 1.4 E1:1 E2:0.6 E3. It was reproducible within 10% from preparation to preparation. The E. coli complex was resolved by chromatography on activated thiol Sepharose. Reconstitution of activity yielded a stoichiometry of 1.0 E1:1 E2:0.5 E3. The optimum binding stoichiometry of E1E2 and E2E3 subcomplexes was determined by sedimentation experiments and found to be 2.0 E1:1 E2 and 2.5 E3:1 E2, respectively. Competition between E1 and E3 was observed in the binding experiments, but not in the kinetic experiments. Hybrid active complexes could be reconstituted from either an E1E2 subcomplex from Azotobacter vinelandii and the E3 component from E. coli or from E2E3 subcomplex from E. coli and the E1 component from A. vinelandii. Low activity and weak binding was observed when E1 from E. coli was recombined with an E2E3 subcomplex from A. vinelandii or when E3 from A. vinelandii was recombined with an E1E2 subcomplex from E. coli. The association behaviour and stoichiometry of the reconstituted complexes is determined by the nature of the E2 component. The formation of hybrid complexes indicates a considerable structural similarity between the complexes from both sources, despite the differences in size and stoichiometry." @default.
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- W1963804963 date "1985-10-01" @default.
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- W1963804963 title "Hybrid pyruvate dehydrogenase complexes reconstituted from components of the complexes from Escherichia coli and Azotobacter vinelandii" @default.
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- W1963804963 doi "https://doi.org/10.1111/j.1432-1033.1985.tb09160.x" @default.
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