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相关概念视频

Protein Folding01:22

Protein Folding

Overview
RNA Stability01:53

RNA Stability

Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
Amino acids03:42

Amino acids

Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible for...
RNA Stability01:53

RNA Stability

Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
Structures of Carboxylic Acid Derivatives01:28

Structures of Carboxylic Acid Derivatives

Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
Protein Folding01:25

Protein 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...

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相关实验视频

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一个膜蛋白中的Cαα-H...O键是不稳定的.

Sarah Yohannan1, Salem Faham, Duan Yang

  • 1Department of Chemistry and Biochemistry, UCLA-DOE Center for Genomics and Proteomics, Molecular Biology Institute, 655 Boyer Hall, University of California, Los Angeles, Los Angeles, California 90095-1570, USA.

Journal of the American Chemical Society
|February 26, 2004
PubMed
概括

实验证据表明,calpha-H...O键并不能显著地稳定蛋白质. 在bacteriorhodopsin中突变一个关键残留物没有显示稳定性损失,这挑战了这些键在蛋白质结构中所扮演的角色.

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科学领域:

  • 生物化学 生物化学
  • 结构生物学 结构生物学
  • 蛋白质折叠 蛋白质的折叠

背景情况:

  • 卡尔法-H...O键在蛋白质结构中很常见,并被认为可以稳定蛋白质,特别是膜蛋白.
  • 能量计算表明,这些键的强度是传统键的一半.
  • 蛋白质中calpha-H...O键的稳定作用尚未在实验中得到验证.

研究的目的:

  • 实验测试卡尔法-H...O键对蛋白质稳定性的重要性.
  • 为了研究一种特定的Calpha-H...O相互作用对蛋白质稳定性的贡献.

主要方法:

  • 用局部导向的突变生成来改变Thr24在bacteriorhodopsin中的Ala,Val和Ser.
  • 测量了野生类型和突变蛋白的热力学稳定性.
  • 确定了突变者的晶体结构.

主要成果:

  • 将Thr24转变为Ala,Val或Ser并没有显著降低蛋白质的稳定性.
  • 与野生型蛋白质相比,T24A突变体表现出更高的稳定性.
  • 结构分析显示T24A的变化很小,T24S和T24V显示了一些变化,没有一个解释稳定性变化.

结论:

  • 卡尔法-H...O 键并不是对背后小素稳定性的主要贡献者.
  • 研究的Thr24残留物似乎破坏了蛋白质的稳定,而不是稳定.
  • 实验发现挑战了Calpha-H...O键在蛋白质稳定中发挥重要作用的假设.