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Flavodoxin from Wolinella succinogenes

S Biel1, O Klimmek, R Gross

  • 1Institut für Mikrobiologie, Johann Wolfgang Goethe-Universität, Marie-Curie-Strasse 9, D-60439 Frankfurt am Main, Germany.

Archives of Microbiology
|August 1, 1996
PubMed
Summary
This summary is machine-generated.

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Flavodoxin, a protein in Wolinella succinogenes, primarily supports anabolic processes, not energy-producing catabolic functions. This flavodoxin plays a key role in cellular biosynthesis.

Area of Science:

  • Microbiology
  • Biochemistry
  • Molecular Biology

Background:

  • Wolinella succinogenes utilizes fumarate or polysulfide as terminal electron acceptors.
  • Flavodoxins are electron transfer proteins crucial in various metabolic pathways.

Purpose of the Study:

  • To isolate and characterize flavodoxin from Wolinella succinogenes.
  • To determine the function of flavodoxin in W. succinogenes metabolism, distinguishing between anabolic and catabolic roles.

Main Methods:

  • Isolation and purification of a monomeric flavoprotein (18.8 kDa).
  • N-terminal sequencing, FMN content analysis, and redox potential measurements.
  • Enzyme activity assays for pyruvate:flavodoxin oxidoreductase and electron transfer from donor enzymes.

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Main Results:

  • Isolated flavoprotein identified as flavodoxin (Fld) with specific redox potentials (-95 mV and -450 mV at pH 7.5).
  • Flavodoxin content remained consistent irrespective of growth conditions (fumarate or polysulfide).
  • Flavodoxin did not interact with known electron donor enzymes (hydrogenase, formate dehydrogenase) but showed activity with pyruvate:flavodoxin oxidoreductase.

Conclusions:

  • Flavodoxin in W. succinogenes is not involved in electron transport to terminal acceptors.
  • The enzyme pyruvate:flavodoxin oxidoreductase utilizes flavodoxin, suggesting a role in biosynthesis.
  • Flavodoxin likely serves anabolic functions in W. succinogenes rather than catabolic ones.