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Upregulation of PG synthesis on sulfur-starvation for PS I in Chlamydomonas.

Abstract：

: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(2) 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.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Sugimoto K,Midorikawa T,Tsuzuki M,Sato N

doi

10.1016/j.bbrc.2008.02.058

subject

Has Abstract

pub_date

2008-05-02 00:00:00

pages

660-5

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(08)00331-8

journal_volume

369

pub_type

杂志文章

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