Rhodopseudomonas sphaeroides membranes: alterations in phospholipid composition in aerobically and phototrophically grown cells.

Journal of Bacteriology
J C Onishi, R A Niederman

Abstract

The effects of growth conditions on phospholipid composition in Rhodopseudomonas sphaeroides have been reexamined. The levels of phosphatidylethanolamine (27 to 28%), phosphatidylglycerol (23 to 24%), and phosphatidylcholine (11 to 18%) were very similar in cells grown aerobically or phototrophically at a high light intensity, consistent with findings for another member of Rhodospirillaceae. In addition, an unknown phospholipid species was detected which comprised 20 to 30% of the total phospholipid in these cells. In cells growing phototrophically at low-intensity illumination, the level of phosphatidylethanolamine increased by about 1.6-fold and that of the unknown phospholipid markedly decreased. Although the synthesis of photosynthetic pigments, light-harvesting protein, and intracytoplasmic photosynthetic membranes also increased markedly, the ratios of individual phospholipid species were essentially identical in photosynthetic membrane and cell wall fractions purified from these cells. Since a significant exchange of lipids apparently did not occur during the isolation of these fractions, it was suggested that the changes in cellular phospholipid accumulation were not due to a unique composition within the photosynthetic...Continue Reading

References

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Citations

Mar 4, 2015·Journal of Bacteriology·Kimberly C LemmerTimothy J Donohue
Apr 25, 2012·Journal of Bioenergetics and Biomembranes·Francesco MilanoLászló Nagy
Dec 2, 2009·Biophysical Journal·Danielle E ChandlerKlaus Schulten

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