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Utilization of a chloroplast membrane sulfolipid as a major internal sulfur source for protein synthesis in the early phase of sulfur starvation in Chlamydomonas reinhardtii
Author(s) -
Sugimoto Koichi,
Sato Norihiro,
Tsuzuki Mikio
Publication year - 2007
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2007.08.035
Subject(s) - chlamydomonas reinhardtii , chloroplast , biochemistry , rubisco , chlamydomonas , sulfur , biology , protein biosynthesis , chemistry , photosynthesis , mutant , organic chemistry , gene
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.