和植物乙酸合成酶的结构
Thierry Lonhienne1, Yu Shang Low2, Mario D Garcia2
1School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia. t.lonhienne@uq.edu.au.
Nature
|July 9, 2020
概括
乙酸合成酶 (AHAS) 的酶结构显示了保存的马耳他十字结构. 这一发现阐明了分支链氨基酸生物合成是如何调节的以及除草剂是如何向AHAS的.
科学领域:
- 生物化学
- 酵素学
- 结构生物学
背景情况:
- 乙酸合成酶 (AHAS) 或乙酸合成酶对于分支链氨基酸生物合成至关重要.
- AHAS是50多种商用除草剂的有效点.
- 酶需要催化和调节子单元才能发挥最佳功能.
研究的目的:
- 阐明AHAS复合体的结构组织.
- 了解催化和调节子单元之间的通信.
- 调查不同王国的AHAS建筑的保存.
主要方法:
- 使用X射线结晶学来确定Saccharomyces cerevisiae和Arabidopsis thaliana的AHAS复合物的结构.
- 对Mycobacterium结核病AHAS复合体进行了比较结构分析.
主要成果:
- 调节子单元形成一个核心,并附有催化子单元二次元,形成马耳他十字形状.
- 结构洞察力揭示了由分支链氨基酸激活和反抑制的途径.
- 结核菌的AHAS复合体具有相似的结构,表明进化保存.
结论:
- 保存的马耳他交叉结构对AHAS在分支链氨基酸生物合成中的功能至关重要.
- 了解这种结构为除草剂设计和耐药性管理提供了基础.
- 这种结构的保存突显了这种酶复合物的进化重要性.
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