![Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F55858.jpg&w=3840&q=50)
バイオインスピレーションによるDi-Fe複合体:四つの酸化状態における相関構造と陽子の移転
Justin L Lee1, Saborni Biswas2, Chen Sun1
1Department of Chemistry, University of California,1102 Natural Sciences II, Irvine, California 92697, United States.
Journal of the American Chemical Society
|February 22, 2022
まとめ
研究者は酸化中の陽子と電子の動きを追跡するために新しいdi-Fe複合体を開発しました. これは生物学的プロセスに不可欠なdi-Fe酵素の機能と安定性に関する重要な洞察を提供します.
科学分野:
- バイオ有機化学
- 協調化学
- 酵素メカニズム
背景:
- メタロプロテイン内の Di-Fe コアは,多様な化学反応性にとって不可欠です.
- 陽子と電子の移転は重要ですが 構造的には研究が困難です
- 顕微鏡法ではしばしば酸化還元変化が確認されますが,陽子の動きは評価するのが困難です.
研究 の 目的:
- 段階的酸化中の陽子と電子の動きを特定するためのdi-Fe複合体を開発する.
- 電子と陽子の移転を調節するダイナミック・コーディネーション球の役割を調査する.
- di-Fe酵素の安定性と反応性についての機械的洞察を得るために.
主な方法:
- 新しいdi-Fe複合体の合成は,リン酸性アミド三脚リガンド ([poat]3-) を使用する.
- 二酸化鉄の複合体の段階的な電気化学的酸化.
- 構造的および電子的変化を監視するためのスペクトル分析.
- フェノールと反応し,反応のメカニズムを調べる.
主要な成果:
- di-Fe (II) から Fe (III) Fe (IV) への段階的な酸化が可能な開発されたdi-Fe複合体.
- 電子と陽子の移転を促進するダイナミックな調整球を観測した.
- ヒドロキシドブリッジをオキシドブリッジリングリガンドに変換し,リガンドのプロトネーションを特定した.
- フェノールとの反応で,Fe ((IV) に電子移転とオキシドリガンドへの陽子の移転で,同解性O-H結合の裂解が実証されている.
結論:
- 開発されたdi-Fe複合体は,結合された電子-陽子の移転を研究するためのプラットフォームを提供します.
- di- Fe活性部位の安定性と反応性に関するメカニズム的な洞察が得られた.
- この発見は,di-Fe酵素の機能を理解するのに役立つ.
さらに関連する動画
06:31Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase
Published on: March 19, 2020
7.2K
11:04Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
Published on: September 7, 2019
9.3K
関連する概念動画
01:43Electron Transport Chain: Complex III and IV
8.2K
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
8.2K
01:41The Supercomplexes in the Crista Membrane
2.6K
The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
2.6K
03:45Formation of Complex Ions
24.2K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
24.2K
02:42Valence Bond Theory
9.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
9.8K
01:30Ladder Diagrams: Redox Equilibria
548
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+...
548
01:46Electron Transport Chain: Complex I and II
15.2K
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
15.2K