单离子对对于稳定SHP2的开放形状至关重要.
Sean H Kim1, Maya L Bulos1, Jennifer A Adams1
1Department of Chemistry and Program in Biochemistry & Biophysics, Amherst College, Amherst, Massachusetts 01002, United States.
Biochemistry
|January 22, 2024
概括
研究人员确定了稳定含有Src-homology-2-domain PTP-2 (SHP2) 的活性状态的关键相互作用. 谷氨酸249和氨酸111之间的离子对对SHP2至关重要.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 酶学 是一种酶学.
背景情况:
- 含有Src-homology-2-domain的PTP-2 (SHP2) 是一个关键的信号酶,与人类疾病有关.
- SHP2活动由其无活跃 (封闭) 和活跃 (开放) 形状之间的平衡来调节.
- 了解SHP2的开放状态稳定对于治疗策略至关重要.
研究的目的:
- 为了确定特定的氨基酸相互作用,稳定SHP2.的活性 (开放) 构造.
- 研究通过突变发生的SHP2开放状态稳定的生物化学基础.
主要方法:
- 在SHP2的开放形状的域间接口的残留物的系统性突变发生.
- 对野生型和突变SHP2蛋白质的开放/关闭形状平衡的评估.
主要成果:
- 发现几种氨基酸相互作用稳定了SHP2的开放状态.
- 在Glutamate 249 (PTP域) 和Arginine 111 (域间循环) 之间确定了一个关键的离子对.
- 破坏R111/E249离子对显著有利于封闭 (抑制) 状态,产生"过度抑制"的SHP2突变.
结论:
- R111/E249离子对是稳定SHP2的活性构造的一个关键决定因素.
- 已识别的"过度抑制"SHP2突变为研究SHP2信号提供了新的工具.
- 这些发现提升了对SHP2调节及其在疾病抑制中的作用的理解.
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