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蓝色温和凝胶双向电泳用于分析嗜盐菌质膜蛋白复合物 被引量:1

Analysis of Proteins in Plasma Membrane From Halophilic Bacteria by Two Dimensional Blue Native Gel Electrophoresis
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摘要 为了揭示细胞对盐胁迫渗透适应的分子机制,以新鉴定的中度嗜盐芽孢杆菌Bacillussp.I121为实验材料,分析了该嗜盐菌质膜上的盐胁迫响应蛋白.为此,通过蓝色温和凝胶双向电泳(BN/SDS-PAGE)对纯化的质膜组分进行了差异蛋白质组学研究.经MALDI-TOF/TOF质谱分析,鉴定了8个盐胁迫响应蛋白.盐胁迫诱导上调表达的蛋白质包括ABC型转运蛋白、3-磷酸甘油透性酶、嘧啶核苷转运蛋白和甲酸脱氢酶,下调表达的蛋白质包括琥珀酸脱氢酶(succinate dehydrogenase)铁硫亚基、黄素蛋白亚基、细胞色素b556亚基以及分子伴侣DnaJ的同源蛋白;酶活力测定结果表明胁迫条件下上述蛋白质的活性变化与表达量变化相一致.这些蛋白质中绝大多数属于高度疏水的跨膜蛋白,主要负责物质跨膜运输及能量代谢.上述结果表明,中度嗜盐菌Bacillus sp.I121可通过加快跨膜物质运输,同时抑制TCA循环完成盐胁迫条件下相容性溶质脯氨酸和四氢嘧啶的合成与积累.也进一步证明,蓝色温和凝胶双向电泳不仅可用于线粒体、叶绿体中蛋白质复合物的分析,也同样适用于细胞质膜上高度疏水蛋白复合物的比较研究. In order to reveal the mechanisms of cell osmo-adaptation to salt stress, a newly identified moderately halophilic Bacillus sp. I121 was used to study the salt-stress responding proteins. Differential proteomic analysis of the purified plasma membrane fractions were performed by two dimensional Blue-Native/SDS-PAGE. Eight proteins corresponding to NaCl were identified by MALDI-TOF/TOF. Up-regulated proteins under salt stress include an ABC transporter permease, glycerol-3-phosphate permease, pyrimidine nucl...
出处 《生物化学与生物物理进展》 SCIE CAS CSCD 北大核心 2010年第5期558-567,共10页 Progress In Biochemistry and Biophysics
基金 国家自然科学基金(30771300) 国家高技术研究发展计划(863)(2007AA10Z114)资助项目~~
关键词 嗜盐芽孢杆菌 相容性溶质 质膜 蛋白质复合物 蓝色温和凝胶电泳 halophilic Bacillus compatible solute plasma membrane protein complex blue native gel electrophoresis
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