从片中主要的乳蛋白中结触发分子间二硫化物开关的结构分析
Samuel C Carr1, Peter J Facchini1, Kenneth K S Ng1
1Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
植物PR10蛋白调节类生物合成. 与PR10-10结合的联体破坏了二硫化物键,控制了BIA的产生. 这揭示了植物中一种新的调节机制.
科学领域:
- 生物化学 生物化学
- 植物科学 植物科学
- 结构生物学 结构生物学
背景情况:
- 与植物病变发生相关的第10家族 (PR10) 蛋白质在片的乳中丰富.
- PR10蛋白对于基化 (BIA) 生物合成至关重要.
- 之前的研究表明,在BIA结合后,PR10-10的形状变化.
研究的目的:
- 阐明在PR10-10中将BIA连接物结合到二硫化物键形成/裂变的合机制.
- 调查保存的氨酸残留物 (Cys59和Cys155) 在PR10-10结构和功能中的作用.
- 了解连接物结合如何调节分子间二硫化物键的动态.
主要方法:
- 局部定向的突变发生产生Cys59Ser和Cys155Ser PR10-10突变.
- 用X射线晶体学来确定野生型和突变型PR10-10蛋白质的结构.
- 在BIA化合物存在或不存在的情况下分析蛋白质构造.
主要成果:
- Cys59Ser和Cys155Ser突变体的晶体结构显示出与BIA结合的野生型PR10-10相似的形状.
- 突变蛋白质在缺少外源BIA时与未识别的配体结合.
- 干结合似乎会破坏分子间的二硫化键,这取决于氨酸的存在.
结论:
- 提出了一个分子机制,其中BIA结合触发了PR10-10中的二硫化物键破坏.
- 这种机制表明PR10蛋白在植物生物合成途径中起着调节作用.
- 这些发现提供了对蛋白质构造变化和连接体诱导调节的见解.
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