溶液核磁共振结构的TatA组件的双氨酸蛋白质运输系统从格兰美阳性细菌Bacillus subtilis
Yunfei Hu1, Enwei Zhao, Hongwei Li
1Beijing NMR Center, Peking University, Beijing 100871, China.
Journal of the American Chemical Society
|August 24, 2010
概括
这项研究揭示了Bacillus subtilis TatA(d) 的原子结构,这是双氨酸运输 (Tat) 系统的关键组成部分. 这种结构澄清了TatA的结构.
科学领域:
- * 分子生物学 * 分子生物学
- * * 结构生物学 结构生物学
- * 生物化学 * 生物化学
背景情况:
- *双氨酸运输系统 (Tat) 对于将折叠的蛋白质在细菌和植物的生物膜中移动至关重要.
- * TatA蛋白是Tat系统的关键组成部分,被认为参与道形成和基质识别.
- * Tat介导蛋白转位的精确分子机制尚不完全理解.
研究的目的:
- * 为了确定来自 Bacillus subtilis 的 TatA(d) 蛋白质的高分辨率结构.
- *阐明TatA在蛋白质转位中的作用的结构基础.
- * 提供对双原素运输系统机制的见解.
主要方法:
- *使用核磁共振 (NMR) 光谱学来确定TatA的溶液结构.
- *使用计算建模和生物物理分析来解释结构数据.
主要成果:
- * 在原子分辨率下确定了TatA的溶液结构,显示了L形形态.
- * TatA(d) 由一个跨膜螺旋和一个两螺旋组成,其大多是无结构的C端尾部.
- * 结构支持一个模型,其中跨膜螺旋在脂质双层中定,两螺旋与膜接口相互作用.
- * 在链区域保存的残留物被确定为结构性重要.
结论:
- *TATA的确定结构 (d) 提供了TAT系统组件的第一个原子层次视图.
- *这些发现支持塔塔在蛋白质转位中的拟议拓和功能作用.
- *这些结构信息对于更深入地了解Tat蛋白传输机制至关重要.
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