相关实验视频
Updated: May 23, 2025
11:00
Determination of the Gas-phase Acidities of Oligopeptides
Published on: June 24, 2013
11.1K
氨酸与有机酸盐相互作用的热力学
Jiyeon Min1, Madolyn Britt2, Bernard R Brooks3
1Biophysics Program, University of Maryland, College Park, MD, USA,; The Laboratory of Computational Biology, National Institutes of Health, Bethesda, MD, USA.
Biophysical journal
|May 22, 2025
概括
这项研究完善了CHARMM力场对氨酸-酸盐相互作用的研究. 通过调整对二酸配置的参数来实现核酸,脂质和膜蛋白的改进模型准确性.
科学领域:
- 生物分子模拟的模拟.
- 计算化学是一种计算化学.
- 生物物理学的生物物理.
背景情况:
- 氨酸-酸盐相互作用对细胞信号传递,蛋白质-核酸结合和膜蛋白功能至关重要.
- 生物分子中的酸盐存在于单和二结构中,分别介导特定和非特定的静电相互作用.
- 对这些相互作用的准确建模对于理解生物过程至关重要.
研究的目的:
- 为了比较CHARMM力场能够重现氨酸酸盐结合热力学的能力.
- 为了确定在建模酸盐相互作用中的差异,特别是在死体配置中.
- 改进CHARMM力场参数,以提高生物分子模拟的准确性.
主要方法:
- 异热定位热量计 (ITC) 用于实验性测量结合能.
- 采用小分子模型和来表示氨酸-酸盐相互作用.
- 进行了CHARMM力场计算,以计算确定约束能.
主要成果:
- 在ITC和CHARMM之间观察到甲基瓜尼迪尼与糖醇/葡萄糖酸盐和氨酸-糖氨酸-氨酸与因诺西三酸盐的良好协议.
- CHARMM显著低估了甲基瓜尼尼与二甲基酸盐 (二体配置) 的实验性结合能量.
- 强力场的精细化包括调整MGUA-二甲基酸盐系统中氧相互作用的伦纳德-斯Rmin参数.
结论:
- 该研究为改进CHARMM力场参数的酸盐相互作用提供了实验验证.
- 对力场的调整可以提高模拟核酸,脂质和膜蛋白的准确性.
- 这项工作有助于对生物分子相互作用的更可靠的计算预测.
相关概念视频
01:01Phosphodiester Linkages
98.3K
Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
98.3K
02:54Protein Kinases and Phosphatases
13.0K
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
13.0K
01:18Indirect-Acting Cholinergic Agonists: Mechanism of Action
1.5K
Indirect-acting cholinergic agonists work by interacting with an enzyme called acetylcholinesterase (AChE) in the synaptic cleft. They can be reversible or irreversible inhibitors and have different effects on the enzyme.
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex,...
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex,...
1.5K
01:13Introduction to Mechanisms of Enzyme Catalysis
7.8K
For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
7.8K
01:29Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship
506
Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
506
01:19Structure of Amines
2.4K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
2.4K