Journal
FEBS LETTERS
Volume 581, Issue 23, Pages 4519-4522Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.febslet.2007.08.035
Keywords
sulfolipid; sulfoquinovosyl diacylglycerol; sulfur source; chloroplast membranes; sulfur starvation; Chlamydomonas reinhardtii
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Information is limited on sulfur (S)-sources inside plant cells for synthesis of the proteins for acclimation to S-starvation. We found that a green alga, Chlamydomonas reinhardtii, when transferred to S-starved conditions, degrades 85% of a chloroplast membrane lipid, sulfoquinovosyl diacylglycerol (SQDG), to redistribute its S to a large part of protein fraction as early as by 6 h. Furthermore, the degradation of SQDG preceded that of proteins such as ribulose bisphosphate carboxylase/ oxygenase, the candidates of internal S-sources. SQDG was thus demonstrated to yield a major internal S-source for protein synthesis during the early phase of acclimation process to S-starvation. (c) 2007 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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