Purification, characterization and crystallization of menaquinol: fumarate oxidoreductase from the green filamentous photosynthetic bacterium Chloroflexus aurantiacus

Yueyong Xin, Yih Kuang Lu, Raimund Fromme, Petra Fromme, Robert E. Blankenship

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The integral membrane protein complex, menaquinol:fumarate oxidoreductase (mQFR) has been purified, identified and characterized from the thermophilic green filamentous anoxygenic photosynthetic bacterium Chloroflexus aurantiacus. The complex is composed of three subunits: a 74 kDa flavoprotein that contains a covalently bound flavin adenine dinucleotide, a 28 kDa iron-sulfur cluster-containing polypeptide, and a 27 kDa transmembrane polypeptide, which is also the binding site of two b-type hemes and two menaquinones. The purified complex has an apparent molecular mass of 260 kDa by blue-native PAGE, which is indicative of a native homodimeric form. The isolated complex is active in vitro in both fumarate reduction and succinate oxidation. It has been analyzed by visible absorption, redox titration, chemical analysis and EPR spectroscopy. In addition, phylogenetic analysis shows that the QFR of both C. aurantiacus and Chlorobium tepidum are most closely related to those found in the delta-proteobacteria. The purified enzyme was crystallized and X-ray diffraction data obtained up to 3.2 Å resolution.

Original languageEnglish
Pages (from-to)86-96
Number of pages11
JournalBiochimica et Biophysica Acta - Bioenergetics
Volume1787
Issue number2
DOIs
Publication statusPublished - Feb 2009

Fingerprint

Fumarates
Crystallization
Purification
Bacteria
Oxidoreductases
Chlorobium
Deltaproteobacteria
Native Polyacrylamide Gel Electrophoresis
Vitamin K 2
Flavoproteins
Peptides
Flavin-Adenine Dinucleotide
Molecular mass
Succinic Acid
Heme
Titration
Sulfur
X-Ray Diffraction
Oxidation-Reduction
Paramagnetic resonance

Keywords

  • Characterization
  • Chloroflexus aurantiacus
  • Crystallization
  • Electron transfer chain
  • Menaquinol:fumarate oxidoreductase
  • Purification

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Cell Biology

Cite this

Purification, characterization and crystallization of menaquinol : fumarate oxidoreductase from the green filamentous photosynthetic bacterium Chloroflexus aurantiacus. / Xin, Yueyong; Lu, Yih Kuang; Fromme, Raimund; Fromme, Petra; Blankenship, Robert E.

In: Biochimica et Biophysica Acta - Bioenergetics, Vol. 1787, No. 2, 02.2009, p. 86-96.

Research output: Contribution to journalArticle

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abstract = "The integral membrane protein complex, menaquinol:fumarate oxidoreductase (mQFR) has been purified, identified and characterized from the thermophilic green filamentous anoxygenic photosynthetic bacterium Chloroflexus aurantiacus. The complex is composed of three subunits: a 74 kDa flavoprotein that contains a covalently bound flavin adenine dinucleotide, a 28 kDa iron-sulfur cluster-containing polypeptide, and a 27 kDa transmembrane polypeptide, which is also the binding site of two b-type hemes and two menaquinones. The purified complex has an apparent molecular mass of 260 kDa by blue-native PAGE, which is indicative of a native homodimeric form. The isolated complex is active in vitro in both fumarate reduction and succinate oxidation. It has been analyzed by visible absorption, redox titration, chemical analysis and EPR spectroscopy. In addition, phylogenetic analysis shows that the QFR of both C. aurantiacus and Chlorobium tepidum are most closely related to those found in the delta-proteobacteria. The purified enzyme was crystallized and X-ray diffraction data obtained up to 3.2 {\AA} resolution.",
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