谷氨转移酶P1是由棕酸盐修饰的
Vanessa Marensi1, Megan C Yap2, Yuhuan Ji3
1Department of Physiology and Membrane Protein Disease Research Group, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada.
氨酸转移酶P1 (GSTP1) 在多个部位经历棕化,脂肪酸的修饰,包括非氨酸残留物. 这种修改影响GSTP1.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 谷氨转移酶P1 (GSTP1) 是细胞对电友的保护中的关键酶,并调节重要的细胞过程.
- GSTP1通常是细胞质的,但可以与等离子体膜结合,这表明它具有特定的功能.
- 在调节GSTP1局部化和功能的翻译后修改的作用仍然不完全理解.
研究的目的:
- 为了调查GSTP1是palmitoylated的假设.
- 为了确定棕化是否影响GSTP1的动态局部化和细胞功能.
- 为了确定GSTP1棕化位点和性质.
主要方法:
- 在MCF7细胞中分析GSTP1棕化,使用氨酸转氨酸突变物.
- 用氧化 (NaOH) 处理,以评估棕酸附着的稳定性.
- 采用纯化的GSTP1和序列的体外棕化试验.
- 亚细胞分离和修改的近距离结合试验以确定局部化.
主要成果:
- 在MCF7细胞中,GSTP1被棕化,这种修饰被保留在囊素突变蛋白中.
- GSTP1的棕化对NaOH处理具有抗性,这表明稳定的胺键形成.
- 酸序列测序确定了S-palmitoylation在Cys48和Cys102,以及罕见的N-palmitoylation在Lys103.
- 棕化GSTP1被检测到在膜和细胞质分数中,并与血膜相关.
结论:
- GSTP1经历多部位棕化,包括非氨酸残留物 (N-棕化).
- 棕化可能在调节GSTP1的亚细胞局部化和多种细胞功能方面发挥作用.
- 这些发现揭示了GSTP1活动和局部化的新型调节机制.
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