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相关概念视频

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.8K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
2.8K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

2.8K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
2.8K
Protein-protein Interfaces02:04

Protein-protein Interfaces

12.5K
Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
12.5K
Basicity of Aromatic Amines01:18

Basicity of Aromatic Amines

7.2K
The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
7.2K
Protein Networks02:26

Protein Networks

4.0K
An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
4.0K
Protein Organization01:24

Protein Organization

6.5K
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....
6.5K

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相关实验视频

Updated: Jul 15, 2025

Author Spotlight: A Computational Approach to Decipher Amino Acid Preferences in Multispecific Protein-Protein Interactions
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分析蛋白质中的阴阳芳香相互作用:阴阳芳香数据库V2.0

Y Bhargav Kumar1,2, Nandan Kumar1, Lijo John1

  • 1Advanced Computation and Data Sciences Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam, India.

Proteins
|October 4, 2023
PubMed
概括

更新后的阴阳芳香数据库 (CAD) 现在包括来自蛋白质结构的超过2700万个阴阳芳香基因. 它详细介绍了相互作用,特别是金属离子与histidine的结合,并揭示了诸如HIS-HIS.这样的流行动机对.

关键词:
氨基酸是氨基酸中的一种.他们的评级是.阴阳芳香的图案是阴阳芳香的.蛋白质是一种蛋白质.

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Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry
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Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry
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Measuring Interactions of Globular and Filamentous Proteins by Nuclear Magnetic Resonance Spectroscopy NMR and Microscale Thermophoresis MST
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科学领域:

  • 生物化学 生化学
  • 结构生物学 结构生物学
  • 生物信息学是一种生物信息学.

背景情况:

  • 阴离子-芳香相互作用对蛋白质结构和功能至关重要.
  • 阴子芳香数据库 (CAD) 之前已经对这些图案进行了目录.
  • 需要更新的存储库,以反映不断增长的PDB数据.

研究的目的:

  • 以最新的蛋白质结构数据更新和扩展阴离子芳香数据库 (CAD).
  • 分析阴阳芳香基因的流行率和特征.
  • 为了确定蛋白质中特定的阴离子-芳香相互作用偏好.

主要方法:

  • 截至2023年6月,从蛋白质数据库 (PDB) 中检索蛋白质结构.
  • 使用距离参数 (r,d1,d2) 识别和分类阴离芳香基因.
  • 对图案几何学 (球形与圆柱形) 和特定残留物对相互作用的分析.

主要成果:

  • 更新后的CAD V2.0包含了来自193,936个蛋白质结构的超过2726万个阴子芳香基因.
  • 球形图案 (94.09%) 比圆柱形图案 (5.91%) 更常见.
  • 金属离子相互作用频繁,其中82.08%涉及histidine;HIS-HIS和TYR-LYS是普遍的对.

结论:

  • 更新后的CAD提供了一个全面的资源,用于研究阴离子-芳香相互作用.
  • 分析揭示了胺在金属离子结合和特定残留偏好的重要作用.
  • 这些数据有助于理解生物分子中的-芳香相互作用的生物学功能.