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Alcaligenes eutrophus possesses a second pyruvate dehydrogenase (E1)

S Hein1, A Steinbüchel

  • 1Institut für Mikrobiologie, Westfälischen Wilhelms-Universität Münster, Germany.

European Journal of Biochemistry
|May 1, 1996
PubMed
Summary
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Alcaligenes eutrophus possesses multiple pyruvate dehydrogenase E1 components. A newly identified gene, pdhE, encodes a functional E1 component that can complement pyruvate dehydrogenase deficiencies in E. coli.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • The pyruvate dehydrogenase complex is crucial for cellular energy metabolism.
  • Alcaligenes eutrophus is known to possess the PdhA E1 component of this complex.

Purpose of the Study:

  • To identify and characterize additional pyruvate dehydrogenase E1 components in Alcaligenes eutrophus.
  • To investigate the functional role of a newly discovered pyruvate dehydrogenase E1 gene, pdhE.

Main Methods:

  • Hybridization screening using a pdhA-specific DNA probe to identify gene loci.
  • Genomic cloning and DNA sequencing of a 3.896-kbp region containing the pdhE gene.
  • Heterologous expression of pdhE in an Escherichia coli aceEF deletion mutant.

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Main Results:

  • Two novel gene loci hybridizing with pdhA were identified, indicating multiple pyruvate dehydrogenase E1s in A. eutrophus.
  • The pdhE gene was sequenced, revealing a gene encoding an 898-amino acid E1 component with similarities to other known E1 subunits.
  • Heterologous expression of pdhE in E. coli demonstrated functional activity and phenotypic complementation to acetate prototrophy.

Conclusions:

  • Alcaligenes eutrophus possesses at least two distinct pyruvate dehydrogenase E1 components beyond PdhA.
  • The pdhE gene product is a functional pyruvate dehydrogenase E1 component that can substitute for the native E1 in E. coli.
  • This finding expands our understanding of the diversity and regulation of pyruvate dehydrogenase complexes in bacteria.