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Isolation and properties of membrane-bound cytochrome c-552 from photosynthetic bacterium Chromatium vinosum

Photosynthesis Research volume 4, pages 49–60 (1983)Cite this article

Abstract

A membrane-bound cytochrome c-552 was isolated and purified from the photosynthetic bacterium Chromatium vinosum by treatment with sodium cholate, sodium deoxycholate and bacterial alkaline protease followed by gel filtration.

The purified cytochrome c-552, which may have been modified by the protease treatment, was electrophoretically homogeneous. Its minimal molecular weight was estimated to be 19 and 20 kdaltons, respectively by SDS polyacrylamide gel electrophoresis and by gel filtration on Sephadex G-100.

Cytochrome c-552 showed the absorption maxima at 419, 523 and 552 nm in the reduced form. Reduced-minus-oxidized difference millimolar absorption coefficient was 10.6 for the wavelength pair, 552 minus 540 nm. The midpoint potential at pH 8.0 was −130 mV. The polarity in the amino acid composition of cytochrome c-552 was 40.1% and reflected its hydrophobicity.

The solubilized cytochrome c-552 was shown to be a different entity from the soluble flavocytochrome c-552 in several respects.

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Affiliations

  1. Department of Biology, Faculty of Science, Kyushu University 33, 812, Fukuoka, Japan

    Michio Doi, Ken -Ichiro Takamiya & Mitsuo Nishimura

Authors
  1. Michio Doi
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  2. Ken -Ichiro Takamiya
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  3. Mitsuo Nishimura
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Doi, M., Takamiya, K.I. & Nishimura, M. Isolation and properties of membrane-bound cytochrome c-552 from photosynthetic bacterium Chromatium vinosum . Photosynth Res 4, 49–60 (1983). https://doi.org/10.1007/BF00041800

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  • DOI: https://doi.org/10.1007/BF00041800

Key words

  • Chromatium vinosum
  • chromatophore membrane
  • cytochrome c-552
  • membrane-bound cytochrome
  • photosynthetic bacterium