相关实验视频
Updated: Jun 21, 2026

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Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
Published on: November 29, 2013
高度保存的胺在蛋白质拼接中起着双重的催化作用:一个pKa转移机制
Zhenming Du1, Philip T Shemella, Yangzhong Liu
1Biology Department, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York 12180, USA.
Journal of the American Chemical Society
|July 28, 2009
概括
蛋白质拼接依赖于胺残留物. 这项研究揭示了一个关键的histidine.
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:
- 蛋白质拼接是一种自催化过程.
- 酸催化对于蛋白质拼接至关重要.
- 保存的histidines在整体中起着至关重要的作用.
研究的目的:
- 为了研究保存的B块胺在蛋白质拼接中的作用.
- 为了确定前体和拼接整体中的B块丁的pK (a) 值.
- 通过计算建模阐明B块丁的催化机制.
主要方法:
- 核磁共振 (NMR) pK (a) 测定.核磁共振 (NMR) 测定.核磁共振 (NMR) pK (a) 测定.核磁共振 (NMR) pK (a) 测定.核磁共振 (NMR) pK (a) 测定.核磁共振 (NMR) pK (a) 测定.核磁共振 (NMR) pK (a) 测定.核磁共振 (NMR) pK (a) 测定.核磁共振 (NMR) 测定.
- 量子力学/分子力学 (QM/MM) 建模.
- 来自Mycobacterium tuberculosis (Mtu) RecA intein. 的工程整体的研究
主要成果:
- 对于B-块丁,观察到一个显著的pK (a) 转移.
- B-块丁在前体中具有7.3 +/- 0.6的pK (a) 和在拼接的整体中<3.5.
- QM/MM 数据表明,histidine 在催化过程中具有双重作用.
结论:
- 在蛋白质拼接过程中,B-块的histidine充当一般基和一般酸.
- 观察到的pK (a) 转移解释了histidine的催化作用和保存.
- 这种机制提供了对蛋白质拼接的精确自催化性质的洞察.
相关概念视频
Conserved Binding Sites
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Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
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Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
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Chromatin Structure Regulates pre-mRNA Processing
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The chromatin structure, especially...
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Covalently Linked Protein Regulators
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These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
Allosteric Proteins-ATCase
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 pathway,...
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 pathway,...
Conservation of Protein Domains Over Different Proteins
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
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