期刊
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
卷 369, 期 2, 页码 660-665出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2008.02.058
关键词
Chlamydomonas reinhardtii; phosphatidylglycerol; photosystem I; sulfoquinovosyl diacylglycerol; sulfur-starvation; thylakoid membranes
Sulfur(S)-starvation was previously shown to induce the degradation of an acidic lipid in chloroplasts, sulfoquinovosyl diacylglycerol (SQDG), to yield a major internal S-source in a green alga, Chlamydomonas reinhardtii. We here found that the synthesis of phosphatidylglycerol (PG), the other acidic lipid in chloroplasts, is activated to elevate its content up to a level that just compensates for the loss of SQDG. Similar activation of PG synthesis was also observed in an SQDG-deficient mutant under S-replete conditions, which led us to propose that upregulation of PG synthesis under S-starved conditions occurs through direct sensing of SQDG-loss, but not of S-starvation. Moreover, thylakoid membranes isolated from S-starved cells were reduced in photosystem I activity on treatment with phospholipase A, that specifically broke down PG, which suggested a critical role of PG that is increased under S-starved conditions in the maintenance of the photosystem I activity. (c) 2008 Elsevier Inc. All rights reserved.
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