碳氧末端导致油酸酸酶在膜双层上的界面组合
Christopher D Radka1, Christy R Grace2, Hale S Hasdemir3
1Department of Microbiology, Immunology, and Molecular Genetics, University of Kentucky, Lexington, Kentucky, USA; Department of Host Microbe Interactions, St Jude Children's Research Hospital, Memphis, Tennessee, USA.
The Journal of biological chemistry
|January 11, 2024
概括
油酸酸酶 (OhyA) 酶使用其碳酸终端域 (CTD) 结合酸糖醇二层,使不和脂肪酸提取用于水合. 这种螺旋旋转螺旋形象的目标是双层.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 微生物学 微生物学
背景情况:
- 油酸酸酶 (OhyA) 是一种可溶性黄蛋白,可水不和脂肪酸.
- OhyA必须访问嵌入在膜双层中的脂肪酸,以便进行基质加工.
- OhyA的碳氧终端域 (CTD) 与膜相互作用有关.
研究的目的:
- 阐明OhyA与膜双层相互作用并从膜双层提取脂肪酸的机制.
- 描述CTD在膜结合和基质获取中的作用.
- 为了确定OhyA的膜结合的结构基础.
主要方法:
- 在Staphylococcus aureus中进行超分辨率显微镜.
- 低温电子显微镜 (cryo-EM) 和3D可变性分析.
- 表面等离子体共振 (SPR) 是一种
- 核磁共振 (NMR) 光谱学 核磁共振 (NMR) 光谱学
- 用MnCl2进行对磁性放松增强剂 (PRE).
- 分子动力学 (MD) 模拟
- 局部导向的突变发生.
主要成果:
- 含有螺旋旋转螺旋图案的CTD足以将OhyA招募到膜中.
- OhyA及其CTD结合到具有纳米分子亲和力的脂甘油 (PG) 双层.
- 结构和生物物理数据显示,CTD与PG双层表面的酸盐头组相互作用,而不会插入疏水核.
- 在螺旋旋转螺旋图案中的关键残留物被确定为膜协会的关键.
结论:
- OhyA CTD使用带正电荷的螺旋-转-螺旋动态,专门结合PG双层负电荷的酸盐层.
- 这种相互作用促进了两层嵌入的不和脂肪酸的提取,以后由OhyA进行水合.
- 这项研究揭示了膜相关酶基质获取的新型机制.
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