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. 1982 Mar;149(3):831–839. doi: 10.1128/jb.149.3.831-839.1982

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

J C Onishi, R A Niederman
PMCID: PMC216469  PMID: 6977537

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 membrane. Instead, these phosphoglyceride changes were found to be related to overall phospholipid metabolism and could be accounted for principally by differences in biosynthetic rates. These results, together with studies in nutrient-restricted aerobic cells, suggested that the mechanism by which phospholipid levels are regulated may be related to radiant energy flux rather than cellular energy limitation.

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Selected References

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