αC-β4循环在蛋白激酶结构和动态中的作用
Jian Wu1, Nisha A Jonniya1, Sophia P Hirakis2
1Department of Pharmacology, University of California, San Diego, San Diego, United States.
eLife
|December 4, 2024
概括
蛋白激酶中的αC-β4循环对于维持疏水性核心结构和叶片通信至关重要. 突变会破坏这种相互作用,影响ATP结合和激酶功能.
科学领域:
- 结构生物学是结构生物学.
- 生物化学 生物化学
- 计算生物学是一种计算生物学.
背景情况:
- αC-β4循环是蛋白质激酶中保存的二次结构元素.
- 它在酶核的疏水结构中的作用被低估了.
- 疏水性脊柱对酶功能至关重要.
研究的目的:
- 为了回顾αC-β4循环的结构和功能.
- 为了研究αC-β4循环与酶核的疏水脊柱之间的联系.
- 分析突变对酶动态和通信的影响.
主要方法:
- 对关于αC-β4循环的现有文献的审查.
- 利用局部空间模式 (LSP) 调整,一个计算工具,分析蛋白质结构.
- 使用LSP询问F100A突变体,并与野生类型结构进行比较.
- 分析了阿波C子单元的NMR预测和脊柱/侧链动态.
主要成果:
- LSP分析证实了αC-β4循环的重要性及其与疏水性脊柱的联系.
- F100A突变显著影响N和C叶接口的关键残留物.
- Apo C子单元分析显示,αC-β4循环的骨干动力学没有显著变化,但K105.5的侧链动力学发生了变化.
- 在F100A突变体中,LSP表明酶叶之间通信中断.
结论:
- αC-β4循环对于保持酶疏水核和间通信的完整性至关重要.
- 这一循环中的突变,如F100A,破坏了这些关键相互作用,与NMR发现一致.
- 了解这些结构动态是理解激酶调节和功能的关键.
相关概念视频
Protein Kinases and Phosphatases
13.0K
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
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
13.0K
Protein Folding
117.3K
Overview
117.3K
Protein and Protein Structure
78.5K
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...
A protein's shape is critical to its function. For example, an enzyme...
78.5K
Assembly of Signaling Complexes
5.7K
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
5.7K
Amplifying Signals via Enzymatic Cascade
8.3K
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...
8.3K
ATP Synthase: Mechanism
13.9K
In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
13.9K


