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相关概念视频

Protein Organization01:13

Protein Organization

Overview
Protein Folding01:22

Protein Folding

Overview
Protein and Protein Structure02:15

Protein and Protein Structure

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 can...
Protein Folding01:22

Protein Folding

Overview
Protein Organization01:24

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
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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Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy
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Published on: April 28, 2011

小链的内在折叠:光谱证据表明,在气相中形成β转.

Wutharath Chin1, Jean-Pierre Dognon, François Piuzzi

  • 1Laboratoire Francis Perrin (URA CEA-CNRS 2453), Service des Photons, Atomes et Molécules, Centre d'Etudes de Saclay, Bât. 522, 91191 Gif-sur-Yvette Cedex, France.

Journal of the American Chemical Society
|January 13, 2005
PubMed
概括

气相激光谱学揭示了稳定的β转,这对于理解蛋白质结构至关重要. 这项研究证实了它们的内在稳定性和依赖序列的形成,为生物折叠提供了洞察力.

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10:09

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Published on: April 28, 2011

Microfluidic Mixers for Studying Protein Folding
12:42

Microfluidic Mixers for Studying Protein Folding

Published on: April 10, 2012

Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
07:26

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Published on: November 21, 2013

科学领域:

  • 生物物理学的生物物理.
  • 化学物理 化学物理
  • 计算化学计算化学

背景情况:

  • 激光溶解和光谱法允许在气相中观察二次结构.
  • β转是蛋白质的基本结构动图,影响其整体功能.
  • 了解单独的折是解读蛋白质结构稳定性关系的关键.

研究的目的:

  • 为了研究气相模型中的β转的形成和稳定性.
  • 为内在β转向稳定性及其与其他结构的竞争提供光谱证据.
  • 为了将气相观测与理论计算和蛋白质残留倾向相关联.

主要方法:

  • 与激光光谱技术 (红外光谱) 相结合的激光脱吸.
  • 含有甘氨酸和氨酸残留物的模型链的合成.
  • 量子力学计算用于描述潜在能量表面.

主要成果:

  • 光谱证据证实了气相链中β转的形成.
  • 确定了这些β转的内在稳定性,表明它们可以与其他形状竞争.
  • 根据残留顺序观察到不同类型的β转,与蛋白质数据一致.
  • 在特定的β转型类型中,甘氨酸的患病率与孤立条件下的能量来源有关.

结论:

  • 对二次结构的气相观测是可行的,并提供了有价值的见解.
  • 贝塔转具有内在的稳定性,并且很容易在孤立的链中形成.
  • 残留序列显著影响β转变类型和稳定性,反映了蛋白质的行为.
  • 能量因素,即使是孤立的,也决定了贝塔转中特定残留物的普遍性.