介质CuIIATCUN物种在生物过程的时间窗口内与生物分子反应
Iwona Ufnalska1, Wojciech Bal1
1Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland.
结合N端铜的ATCUN图案形成了短暂的中间体,这些中间体很容易交换铜,并经过减少. 这些发现表明铜在生物系统中的作用比以前理解的更为动态.
科学领域:
- 生物化学 生物化学
- 金属蛋白化学 金属蛋白化学
- 生物物理化学 生物物理化学
背景情况:
- 的ATCUN图案 (N端Xaa-Zaa-His) 绑定Cu(II) 在一个方形平面几何形状.
- 它在人体蛋白质组中的丰富性和独特的铜结合特性已经得到充分证实.
- IIATCUN复合物的明显惰性与动态的生物铜平衡形成鲜明对比.
研究的目的:
- 为了研究Cu(II) 与ATCUN序列结合的多步性质.
- 直接评估短暂的铜结合中间体的反应性.
- 探索这些中间体在生物铜氧化还原和交换反应中的作用.
主要方法:
- 使用双重混合停止流量实验.
- 采用了一个模型四甲 (DAHK),代表人血清白蛋白的ATCUN动机.
- 分析了铜复合物的交换和还原动力学.
主要成果:
- 在Cu(II) 结合ATCUN序列中确定了部分协调的中间物种.
- 证明一种短暂的2N中间体很容易与histidine交换Cu.
- 显示了2N中间体通过氨快速降解为Cu.
结论:
- 与最终的4N复合体相比,过渡Cu (II) ATCUN中间体具有明显的反应性.
- 这些中间体能够快速交换和减少铜.
- 这些发现需要重新评估ATCUN图案在铜恒温中的生理作用.
更多相关视频
11:38Quantifying the Binding Interactions Between CuII and Peptide Residues in the Presence and Absence of Chromophores
Published on: April 5, 2022
14:43Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications
Published on: September 23, 2013
相关概念视频
Phase II Reactions: Miscellaneous Conjugation Reactions
A key example involves the conjugation of cyanide ions, which impair cellular respiration and alter hemoglobin into non-oxygen-carrying cyanmethemoglobin. To neutralize this threat, a sulfur atom from thiosulphate is transferred to the cyanide ion, catalyzed by the enzyme rhodanese, resulting in an inactive compound called thiocyanate. The production of...
Energy Diagrams, Transition States, and Intermediates
Reaction Mechanisms
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
Radical Reactivity: Intramolecular vs Intermolecular
Allosteric Proteins-ATCase
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
Thermal and Photochemical Electrocyclic Reactions: Overview
