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Identification of symbiosis-specific c-type cytochromes and a putative oxidase in bacteroids of Rhizobium leguminosarum biovar viciae


, : Identification of symbiosis-specific c-type cytochromes and a putative oxidase in bacteroids of Rhizobium leguminosarum biovar viciae. Microbiology 142(1): 41-46

Covalently bound haem proteins and cytochromes were analysed in Rhizobium lequminosarum biovar viciae free-living cells and nitrogen-fixing bacteroids isolated from pea nodules. Increased levels of spectroscopically detectable cytochrome c in bacteroids were correlated with the appearance of two proteins of Mr 30000 and 28000 that contained covalently bound haem. Conversely, bacteroids had undetectable levels of a periplasmic cytochrome c of Mr 14000 that is normally present in free-living bacteria. Difference spectra confirmed that the terminal oxidases, cytochromes aa3 and d, were absent, and photodissociation spectra revealed novel components that may be due to a bacteroid terminal oxidase.


Accession: 002863818

DOI: 10.1099/13500872-142-1-41

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Related references

Vargas, C.; Wu, G.; Delgado, M.J.sus; Poole, R.K.; Downie, J.A.an, 1996: Identification of symbiosis-specific c-type cytochromes and a putative oxidases in bacteroids of Rhizobium leguminosarum biovar viciae. Covalently bound haem proteins and cytochromes were analysed in Rhizobium leguminosarum biovar viciae free-living cells and nitrogen-fixing bacteroids isolated from pea nodules. Increased levels of spectroscopically detectable cytochrome c in bact...

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