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. 1976 Oct;128(1):337–346. doi: 10.1128/jb.128.1.337-346.1976

Isolation and characterization of a glycerol auxotroph of Rhodopseudomonas capsulata: effect of lipid synthesis on the synthesis of photosynthetic pigments.

N C Klein, L Mindich
PMCID: PMC232860  PMID: 977539

Abstract

A glycerol auxotroph was isolated from Rhodopseudomonas capsulata for use as a system for studying membrane synthesis and function. When the mutant was deprived of glycerol, net phospholipid synthesis ceased immediately and a small amount of free fatty acids accumulated. A turnover of lipid occurred in both deprived and supplemented cultures. Deoxyribonucleic acid and protein synthesis continued for one doubling of cell massand then slowed down in deprived cells. Net ribonucleic acid synthesis slowed down more dramatically. Oxidative phosphorylation activity of membrane preparations from aerobically and semi-anaerobically grown cells appeared unaffected by glycerol deprivation, indicating that simultaneous lipid synthesis is not a requirement for new oxidative phosphorylating activity. In the absence of net phospholipid synthesis, bacteriochlorophyll and carotenoid syntheses were reduced to 30% of the activity of supplemented cultures. Delta-Aminolevulinic acid synthase, the first enzyme on the bacteriochlorophyll pathway that is subject to regulatory control, increased in activity in deprived cultures. Lascelles and Szilagyi (1965) showed an association between phospholipid synthesis and pigment production. They found an increased lipid content associated with pigmented cells. The present results indicate that not only is there an association between lipid and pigment synthesis, but also there is actually a dependence of bacteriochlorophyll synthesis on phospholipid synthesis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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