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相关概念视频

Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
Cohesion01:07

Cohesion

Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a surface,...
Protein Folding01:22

Protein Folding

Overview
Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...

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Updated: May 24, 2026

Improving 2D and 3D Skin In Vitro Models Using Macromolecular Crowding
09:14

Improving 2D and 3D Skin In Vitro Models Using Macromolecular Crowding

Published on: August 22, 2016

蛋白质拥挤会影响水分结构和动态.

Ryuhei Harada1, Yuji Sugita, Michael Feig

  • 1RIKEN Advanced Institute for Computational Science, 7-1-26 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047 Japan.

Journal of the American Chemical Society
|February 23, 2012
PubMed
概括
此摘要是机器生成的。

蛋白质拥挤显著改变了水的结构和动态,减少了扩散和介电常数. 这些发现提供了对细胞环境和生物分子稳定性的洞察.

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09:14

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Published on: August 22, 2016

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High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water
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科学领域:

  • 生物物理学的生物物理.
  • 计算化学的计算化学
  • 结构生物学 结构生物学

背景情况:

  • 细胞环境是高度拥挤的宏分子.
  • 了解对水的宏分子拥挤效应对于生物过程至关重要.

研究的目的:

  • 研究蛋白质拥挤对水结构和动态的影响.
  • 在拥挤条件下分析水合,扩散和介电性质的变化.

主要方法:

  • 显式溶剂分子动力学模拟蛋白G和蛋白G/维林系统.
  • 分析辐射分布函数,水化位点和四面体协调.
  • 在不同蛋白质度下测量自我扩散速率和介电常数.

主要成果:

  • 在拥挤的条件下,水结构在第一个溶解之外发生变化.
  • 扩散速率和介电常数随着蛋白质度的增加而线性减少.
  • 在高度拥挤的环境中,水分子表现出受限制的动态.

结论:

  • 蛋白质拥挤显著影响水的结构和动态特性.
  • 降低水动力学对细胞水力学有影响.
  • 降低介电常数会影响拥挤的细胞环境中的生物分子稳定性.
  • 为模拟细胞环境中的溶解提供了一个模型.