使用量子力学计算预测蓝铜蛋白的减少潜力
Maryam Haji Dehabadi1, Mehdi Irani1, Ulf Ryde2
1Department of Chemistry, University of Kurdistan, Sanandaj 66177-15175, Iran.
Inorganic chemistry
|February 20, 2025
概括
计算方法准确地预测了蓝铜蛋白的氧化还原潜力. 最好的方法使用中等大小的量子力学 (QM) 集群,具有特定的密度函数和相对潜力的基础集.
科学领域:
- 生物物理化学 生物物理化学
- 计算化学计算化学
- 蛋白质科学 蛋白质科学
背景情况:
- 蓝铜蛋白是参与电子转移的重要金属蛋白.
- 准确预测它们的氧化还原潜力对于理解生物功能至关重要.
- 计算方法为研究这些属性提供了一个强大的工具.
研究的目的:
- 系统地评估64种计算方法来计算蓝铜蛋白的氧化还原潜力.
- 为了确定最佳的计算参数来预测相对和绝对的氧化还原潜力.
- 评估量子力学/分子力学 (QM/MM) 方法的准确性和局限性.
主要方法:
- 计算了12个蓝铜蛋白位点的氧化还原潜力.
- 系统变化的量子力学 (QM) 系统大小,介电常数,密度函数和基本集.
- 在连续溶剂中利用QM/MM进行结构优化和QM集群计算.
主要成果:
- 一个中间的QM系统大小 (∼70个原子) 与TPSS功能和SV(P) 基础集产生了最好的相对潜力 (MAD = 0.09 V).
- 较大的QM系统 (∼340个原子) 具有B3LYP功能和更大的基础集,改善了绝对电位精度 (MSE = -0.27 V).
- 由于更简单的协调,蓝铜蛋白显示出比铁硫更高的精度.
结论:
- 在连续溶剂中的QM集群计算有效平衡精度和计算成本.
- 选择方法至关重要,取决于是否针对相对或绝对潜力.
- 精确建模蛋白质中氧化还原活性位仍然具有挑战性,但可以通过优化的计算策略实现.
更多相关视频
14:44Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
Published on: December 16, 2013
9.5K
06:53Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
1.9K
相关概念视频
Standard Electrode Potentials
43.2K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
43.2K
Ladder Diagrams: Redox Equilibria
415
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
415
Colors and Magnetism
11.5K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.5K
Crystal Field Theory - Octahedral Complexes
26.0K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.0K
Extraction: Advanced Methods
401
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
401
Electrodeposition
567
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
567
