使用新计算工具测量动力驱动的Allostery:CAP案例研究
Alexandr P Kornev1, Jui-Hung Weng1, Rodrigo A Maillard2
1Departmen of Pharmacology, University of California San Diego, La Jolla, CA 92093, USA.
Journal of molecular biology
|December 14, 2023
概括
蛋白残留网络 (PRN) 揭示了在循环腺单酸盐 (cAMP) 结合过程中催化剂激活蛋白 (CAP) 的动态. 度中心性分析准确地反映了变化,并确定了关键的全位,验证了一种新的计算方法.
科学领域:
- 生物物理学的生物物理.
- 计算生物学 计算生物学
- 结构生物学 结构生物学
背景情况:
- catabolite激活蛋白 (CAP) 是一个由循环腺单酸盐 (cAMP) 调节的关键转录因子.
- 了解CAP中全性调节的动态机制对于破译基因表达控制至关重要.
- 之前的研究表明,由驱动的全ostery控制了CAMP在CAP中的绑定合作性.
研究的目的:
- 通过使用蛋白残留网络 (PRN) 来研究 CAP 在序列cAMP结合期间的动态行为.
- 探索PRN的实用性,特别是程度和中间中心性,用于分析蛋白质动态和全相互作用.
- 验证PRN作为评估与蛋白质热运动相关的变化的可靠方法,并识别全热点.
主要方法:
- 使用局部空间模式 (LSP) 调整构建蛋白质残留网络 (PRNs).
- 将度中心性分析应用于PRN,以探测亚纳秒蛋白质动态和.
- 利用中间中心性来分析全球残留连接性,并确定涉及全菌的关键氨基酸.
主要成果:
- 第一个cAMP分子的结合诱导了循环核酸结合域A (CNBD-A) 的稳定性增加和CNBD-B的不稳定.
- 基于LSP的PRN的中心度为与蛋白质热动力学相关的变化提供了可靠的代理.
- 之间的中心性分析成功地确定了在CAP内调解性相互作用的关键氨基酸,与实验数据一致.
结论:
- 基于LSP的PRN提供了一种强大而准确的方法来分析蛋白质中的由驱动的全.
- 该研究验证了Degree Centrality作为蛋白质热动力学和的可靠指标.
- 这种计算方法提供了一种快速,具有成本效益的工具,用于识别全热点和理解全调节,并有可能应用于其他生物分子.
相关概念视频
Allosteric Proteins-ATCase
5.8K
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
5.8K
Cooperative Allosteric Transitions
2.3K
2.3K
Ligand Binding and Linkage
4.8K
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
4.8K
Protein Dynamics in Living Cells
2.1K
Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
2.1K
Mechanical Protein Functions
4.9K
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.
4.9K
Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving
56
Mechanistic models play a crucial role in algorithms for numerical problem-solving, particularly in nonlinear mixed effects modeling (NMEM). These models aim to minimize specific objective functions by evaluating various parameter estimates, leading to the development of systematic algorithms. In some cases, linearization techniques approximate the model using linear equations.
In individual population analyses, different algorithms are employed, such as Cauchy's method, which uses a...
In individual population analyses, different algorithms are employed, such as Cauchy's method, which uses a...
56


