GAPDH的S-化和S-甲化:相似之处,差异和关系
M V Medvedeva1, S Yu Kleimenov2, V R Samygina3
1Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Moscow 119991, Russia.
通过S-化和S-谷氨基化,可以使甘甲基-3-酸盐脱酶 (GAPDH) 不活化. 与S-基化相比,S-基化的可逆性较小,这两种修饰都会影响蛋白质结构和稳定性.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 翻译后修改 翻译后修改
背景情况:
- 可逆的翻译后修饰,如S-化和S-甲化,在细胞信号和蛋白质功能中起着至关重要的作用.
- 甘-3-酸盐脱酶 (GAPDH) 是一个关键的糖解酶,参与各种细胞过程.
- 了解GAPDH不同修饰之间的相互作用对于阐明细胞调节机制至关重要.
研究的目的:
- 为了比较S-化和S-甲化对GAPDH特性的影响.
- 为了研究将S-化和S-谷氨基化联系在一起的机制.
- 在细胞环境中检查这些修改.
主要方法:
- 在体外酶活性测定.
- 蛋白质结构分析 (热稳定性,素裂变).
- 使用HEK 293 T细胞治疗H2O2或NO供体的细胞研究.
- 西方涂抹和免疫沉.
主要成果:
- 无论是S-化还是S-甲化,都会使GAPDH失活,降低热稳定性,并增加对蛋白质分解的易感性.
- 在谷氨和谷氨素的存在下,S-谷氨化显著不如S-化转化1.
- 在细胞中,H2O2或NO处理导致GAPDH和β-actin的硫化和S-氨基化.
结论:
- S-化和S-甲化是影响GAPDH功能和结构的明显可逆变化.
- 在Cys152.2.中,S-化可能会在GAPDH的S-甲化之前,并促进S-甲化.
- 这种机制可能扩展到细胞环境中的其他蛋白质,如β-actin.
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