Abstract:

Compositions of glycerolipids and fatty acid compositions of glycerolipids were compared among Synechocystis sp. PCC 6803 cells grown in the BG-11 medium containing different concentrations of glucose and Na2S2O3 in this study. It was found that Na2S2O3 can effectively increase the percentage of sulphoquinovosyl diacylglycerol (SQDG) and phosphatidylglycerol (PG) to total membrane lipids and the simultaneous application of glucose with Na2S2O3 can counteract the effect of Na2S2O3. In addition, Na2S2O3 can significantly increase the percentage of palmitic acid (C, 16:0) in fatty acid composition of monogalactosyl diacylglycerol (MGDG) and digalactosyl diacylglycerol (DGDG) and decrease the fatty acid unsaturation degree accordingly, and these effects can also be eliminated by glucose. These results indicate that Na2S2O3 can take as a reductant to make membrane lipids in a low unsaturated state, and the simultaneous application of glucose can decrease the reducing power of Na2S2O3. In addition, Na2S2O3 can take as a sulfur donor for the synthesis of SQDG.

硫代硫酸钠和葡萄糖对Synechocystis sp. PCC 6803 细胞甘油酯及其脂肪酸组成的影响
王则能 侯海彤 许亦农  阳振乐 姜桂珍 匡廷云
（中国科学院植物研究所光合作用与环境分子生理学重点实验室，北京1 0 0 0 9 3 ）

摘要： 对生长在添加有不同浓度的葡萄糖、硫代硫酸钠培养基中的蓝细菌Synechocystis sp. PCC 6803中的甘油酯及其脂肪酸组成进行比较。结果表明：硫代硫酸钠能有效地增加膜脂中硫代异鼠李糖二酰基甘油(SQDG)和磷脂酰甘油(PG)的百分含量，培养基中同时添加葡萄糖时能抵消硫代硫酸钠的这一效应。此外，硫代硫酸钠能显著增加单半乳糖甘油二酯(MGDG)、双半乳糖甘油二酯(DGDG)中十六碳酸(C16:0)的百分含量，这一效应也能为葡萄糖消除。硫代硫酸钠不能显著地改变SQDG中C16:0的百分含量，加入葡萄糖时能降低C16:0的百分含量。这些结果说明硫代硫酸钠可能充当一种还原剂使膜脂处于一种低的不饱和状态，同时加入葡萄糖时能降低硫代硫酸钠的还原力。此外，硫代硫酸钠还可作为SQDG合成中的硫供体。
关键词： 葡萄糖；甘油酯；硫代硫酸钠；Synechocystis sp. PCC 6803

通讯作者。 E-mail: <yinongxu@ns.ibcas.ac.cn>。