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相关概念视频

Cell Polarization by Rho Proteins01:21

Cell Polarization by Rho Proteins

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Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
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Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
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Phosphorylation

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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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相关实验视频

Updated: Jan 8, 2026

Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells
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酸化会诱导改变的质子化状态,并以全学调节Rac1-RhoGDI复合体.

Krishnendu Sinha1, Amit Kumawat2, Hyunbum Jang3

  • 1Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, Kolkata, India.

Protein science : a publication of the Protein Society
|December 22, 2025
PubMed
概括

罗核酸解离抑制剂 (RhoGDI) 的特定位点酸化控制Rac1 GTPase的释放. 在Ser101/Ser174的双酸化通过改变质子化状态和破坏通信通路而使Rac1-RhoGDI结合异质弱化.

关键词:
这是一个GTPase.模拟MD的模拟方法罗格迪 (RhoGDI) 是一种艾洛斯特菌是所有菌的恒定的pH 值 MD MD酸化的方法是:光化.

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科学领域:

  • 分子细胞生物学 分子细胞生物学
  • 生物化学 生物化学
  • 计算生物学 计算生物学

背景情况:

  • 罗GTPases调节细胞的基本功能,包括细胞运动.
  • 罗氨酸核酸解离抑制剂 (RhoGDI) 在不活跃的GDP-bound状态下将Rho GTPases隔离.
  • 已知RhoGDI的特定位点酸化可触发选择性GTPase释放,但根本机制尚未完全理解.

研究的目的:

  • 阐明RhoGDI在Ser101和Ser174的双酸化促进Rac1 GTPase解离的分子机制.
  • 为了对比双化 (SP101/174) 与在Ser96处的惰性化对Rac1-RhoGDI相互作用的影响.
  • 为了研究化介导调节中改变的胺质子化状态和全沟通的作用.

主要方法:

  • 使用恒定pH的分子动力学模拟来建模RhoGDI酸化.
  • 分析胺质子化状态,静电环境和结合亲和力变化.
  • 进行了结构聚类,构造自由能源景观分析和全网络分析.

主要成果:

  • SP101/174酸化诱导了RhoGDI西丁质子状态的明显变化,改变了当地的静电环境.
  • 由于SP101/174,观察到Rac1-RhoGDI结合亲和力显著减少,这与破坏的键和界面接触有关.
  • SP101/174促进了Rac1和RhoGDI中关键区域的变异性和位移的增加,破坏了复杂稳定性至关重要的全沟通通路径.

结论:

  • 在RhoGDI的特定位点酸化,特别是在Ser101/Ser174的双酸化,可以全质调节Rac1相互作用.
  • 酸化调节RhoGDI的质子化状态,减弱结合亲和力,诱导形状变化,并破坏全网络.
  • 这些发现为控制Rac1 GTPase活动中的酸化代码的选择性提供了机制基础.