解读SHP2-E76突变的结构和动态影响:对瘤原性激活的机制性见解
Humaira Rafiq1, Lu Han2, Ashfaq Ur Rehman3
1Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan-23200, Pakistan.
BMC chemistry
|May 14, 2025
概括
在SHP2蛋白中的功能获取突变破坏了其自身抑制,导致活性增强. 与癌症相关的突变会导致比与神经发育障碍相关的突变更严重的结构性破坏.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- SHP2是一种细胞质氨酸酸酶,对细胞调节至关重要.
- SHP2中的突变与癌症和神经发育障碍 (NDD) 有关.
- 功能获取突变破坏了SHP2的自身抑制,增加了它的活性.
研究的目的:
- 研究三种功能获取SHP2突变 (E76D,E76G,E76A) 的结构机制.
- 了解76位单氨基酸变化如何导致不同的疾病表型 (癌症与NDD).
- 阐明诺南综合征与由于SHP2突变增加的癌症风险之间的联系.
主要方法:
- 用分子动力学 (MD) 模拟来分析在Apo状态和三个突变状态 (M1,M2,M3) 中的SHP2.
- 在野生型和突变型SHP2.0之间进行了对比,对形态变化和动态进行了比较.
- 分析的重点是N-SH2和PTP域界面以及这些域之间的距离.
主要成果:
- 癌症和NDD相关的SHP2突变都会破坏N-SH2和PTP接口的稳定,促进激活.
- 与癌症相关的突变比NDD突变引起更严重的接口破坏.
- 突变改变了SHP2的原生形状,并增加了N-SH2和PTP域之间的C距离.
结论:
- SHP2突变破坏了自身抑制并增加了酸酶活性.
- 结构动态揭示了癌症与NDD突变的不同影响.
- 提供了关于癌症和由SHP2.2驱动的NDD分子机制的原子层次洞察力.
相关概念视频
mTOR Signaling and Cancer Progression
3.7K
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
3.7K
The JAK-STAT Signaling Pathway
8.6K
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
8.6K
Interactions Between Signaling Pathways
6.2K
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
6.2K
Mitogens and the Cell Cycle
6.3K
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
6.3K
Abnormal Proliferation
4.4K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.4K
MAPK Signaling Cascades
5.0K
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
5.0K


