Abstract
Characteristics and occurrence of cytochrome c-552 from an aerobic photosynthetic bacterium, Roseobacter denitrificans, were described.
Relative molecular mass of the cytrochrome was 13.5 kDa on sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and 15,000 by gel filtration. This cytochrome was a acidic protein having a pI of 5.6 and Em was +215 mV at pH 7.0. Absorption peaks were at 278, 408 and 524 nm in the oxidized form and 416, 523 and 552 nm in the reduced form.
Amino acid composition and N-terminal amino acid sequence of cytochrome c-552 determined for 24 residues had low similarities to those of cytochrome c-551 of this bacterium, which is homologous to cytochrome c 2, although the physico-chemical properties of these two cytochromes were similar to each other.
Cytochrome c-552 was maximally synthesized in the light under aerobic conditions but not in the dark. The synthesis also occurred in the presence of alternative acceptors such as trimethylamine N-oxide (TMAO) and nitrate under anaerobic conditions. Our results suggest that cytochrome c-552 is involved in TMAO respiration and denitrification in R. denitrificans, although the effect of light remains to be solved.
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Abbreviations
- Em :
-
Midpoint redox potential
- PAGE:
-
Polyacrylamide ge electrophoresis
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- TMAO:
-
Trimethylamine N-oxide
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Takamiya, Ki., Shioi, Y., Morita, M. et al. Some properties and occurrence of cytochrome c-552 in the aerobic photosynthetic bacterium Roseobacter denitrificans . Arch. Microbiol. 159, 51–56 (1993). https://doi.org/10.1007/BF00244264
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DOI: https://doi.org/10.1007/BF00244264