一种二铁蛋白自发生成一个氨酸-氨酸交叉链接
Richard B Cooley1, Timothy W Rhoads, Daniel J Arp
1Department of Biochemistry and Biophysics, 2011 Agriculture and Life Sciences Building, Oregon State University, Corvallis, OR 97331, USA.
Science (New York, N.Y.)
|May 21, 2011
概括
研究人员发现了非功能化蛋白质侧链之间的新型碳-碳交叉链. 这种独特的氨酸-氨酸连接,由二铁中心稳定,揭示了新的翻译后修改可能性.
科学领域:
- 生物化学 生物化学
- 蛋白质化学 蛋白质化学
- 酶学 是一种酶学.
背景情况:
- 蛋白质中的内部共价交叉链通常需要功能化组.
- 氧气,或硫原子通常参与促进交叉链形成.
研究的目的:
- 报告发现了一种新型的蛋白质交叉链接.
- 描述非功能化的氨基酸侧链之间的碳-碳交叉链.
主要方法:
- 研究的蛋白质交叉链接机制.
- 分析了氨酸-氨酸交叉链的形成.
- 研究了碳酸盐桥接二铁中心在反应中的作用.
主要成果:
- 确定了氨酸和氨酸侧链之间的直接碳-碳交叉链.
- 证明了交叉链形成是依赖氧气的.
- 表明二铁中心催化和稳定这种独特的交叉链接.
结论:
- 这一发现代表了一种新的翻译后修改类.
- 铁中心表现出超出已知的功能的新型催化潜力.
- 这一发现挑战了蛋白质交叉链接的现有范式.
相关概念视频
02:04Covalently Linked Protein Regulators
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
02:04Covalently Linked Protein Regulators
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
01:26Protein Modifications in the RER
Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
01:25Protein Folding
Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
01:22Protein Folding
Overview
01:22Protein Folding
Overview