Expression and characterization of the diheme cytochrome c subunit of the cytochrome bc complex in Heliobacterium modesticaldum
Copyright policy )Expression and characterization of the diheme cytochrome c subunit of the cytochrome bc complex in Heliobacterium modesticaldum
Heliobacterium modesticaldum is a Gram-positive, anaerobic, anoxygenic photoheterotrophic bacterium. Its cytochrome bc complex (Rieske/cyt b complex) has some similarities to cytochrome b(6)f complexes from cyanobacteria and chloroplasts, and also shares some characteristics of typical bacterial cytochrome bc(1) complexes. One of the unique factors of the heliobacterial cytochrome bc complex is the presence of a diheme cytochrome c instead of the monoheme cytochrome f in the cytochrome b(6)f complex or the monoheme cytochrome c(1) in the bc(1) complex. To understand the structure and function of this diheme cytochrome c protein, we expressed the N-terminal transmembrane-helix-truncated soluble H. modesticaldum diheme cytochrome c in Escherichia coli. This 25kDa recombinant protein possesses two c-type hemes, confirmed by mass spectrometry and a variety of biochemical techniques. Sequence analysis of the H. modesticaldum diheme cytochrome c indicates that it may have originated from gene duplication and subsequent gene fusion, as in cytochrome c(4) proteins. The recombinant protein exhibits a single redox midpoint potential of +71mV versus NHE, which indicates that the two hemes have very similar protein environments.
- University of Mary United States
- Washington State University United States
Models, Molecular, Spectrometry, Mass, Electrospray Ionization, Sequence Homology, Amino Acid, Amino Acid Motifs, Molecular Sequence Data, Heme, Gram-Positive Bacteria, Models, Biological, Recombinant Proteins, Evolution, Molecular, Protein Subunits, Bacterial Proteins, Genes, Bacterial, Gene Duplication, Escherichia coli, Amino Acid Sequence, Oxidoreductases, Oxidation-Reduction
Models, Molecular, Spectrometry, Mass, Electrospray Ionization, Sequence Homology, Amino Acid, Amino Acid Motifs, Molecular Sequence Data, Heme, Gram-Positive Bacteria, Models, Biological, Recombinant Proteins, Evolution, Molecular, Protein Subunits, Bacterial Proteins, Genes, Bacterial, Gene Duplication, Escherichia coli, Amino Acid Sequence, Oxidoreductases, Oxidation-Reduction
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