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. 1994 Jan 1;297(Pt 1):137–143. doi: 10.1042/bj2970137

The peripheral subunit-binding domain of the dihydrolipoyl acetyltransferase component of the pyruvate dehydrogenase complex of Bacillus stearothermophilus: preparation and characterization of its binding to the dihydrolipoyl dehydrogenase component.

D S Hipps 1, L C Packman 1, M D Allen 1, C Fuller 1, K Sakaguchi 1, E Appella 1, R N Perham 1
PMCID: PMC1137802  PMID: 8280091

Abstract

The peripheral subunit-binding domain of the dihydrolipoyl acetyltransferase polypeptide chain of the pyruvate dehydrogenase multienzyme complex of Bacillus stearothermophilus was released by limited proteolysis from a di-domain (lipoyl domain plus binding domain) encoded by a subgene over-expressed in Escherichia coli. The domain was characterized by N-terminal sequence analysis, electrospray m.s. and c.d. spectroscopy. It was found to be identical in all respects to a chemically synthesized peptide of the same sequence. The association of the di-domain and binding domain (both natural and synthetic) with dihydrolipoyl dehydrogenase was analysed in detail and a tight binding was demonstrated. As judged by several different techniques, it was found that only one peripheral subunit-binding domain is bound to one dimer of dihydrolipoyl dehydrogenase, implying that the association is highly anti-cooperative.

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Selected References

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