Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

The Photochemical Reaction Center01:29

The Photochemical Reaction Center

4.1K
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
4.1K
The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

10.0K
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
10.0K
Channel Rhodopsins01:11

Channel Rhodopsins

2.5K
Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
2.5K
Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

7.2K
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...
7.2K
The Antenna Complex01:42

The Antenna Complex

5.9K
Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency...
5.9K
Photosystem I01:27

Photosystem I

61.9K
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
61.9K

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Surface-Immobilized Rhodium Complex in Vertically Aligned Mesoporous Silica Films for Direct Electroreduction of Diluted CO<sub>2</sub>.

Journal of the American Chemical Society·2026
Same author

In vivo reduction of Treg expansion in rodent helminth-malaria coinfection.

Parasites & vectors·2026
Same author

Structures of variants of Escherichia coli flavodiiron-type nitric oxide reductase reveal changes in the di-iron site.

Acta crystallographica. Section D, Structural biology·2026
Same author

A Bayesian modelling framework for estimating tick-borne pathogen transmission dynamics at the host-tick interface.

PLoS computational biology·2026
Same author

Electroreduction of CO<sub>2</sub> From Flue Gas: Impurity Tolerance and Mechanistic Insights in Molecular Catalysis.

ChemSusChem·2026
Same author

Coinfection with malaria alters the fecundity and within-host persistence of an intestinal nematode.

PLoS neglected tropical diseases·2026

関連する実験動画

Updated: Jun 11, 2025

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation
08:00

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation

Published on: October 4, 2024

511

光活性化人工CO2還元酵素:構造と活動

Raphaël J Labidi1, Bruno Faivre1, Philippe Carpentier2,3

  • 1Laboratoire de Chimie des Processus Biologiques, UMR 8229, Collège de France, CNRS, Sorbonne Université, 11, Place Marcellin-Berthelot, Paris 75005, France.

Journal of the American Chemical Society
|October 1, 2024
PubMed
まとめ
この要約は機械生成です。

研究者らは,効率的な二酸化炭素 (CO2) を一酸化炭素 (CO) に光還元する新しい人工酵素を開発した. この高貴な金属のないシステムは,CO2の変換メカニズムに洞察を与え,記録的な性能を達成しました.

さらに関連する動画

Light-driven Enzymatic Decarboxylation
09:58

Light-driven Enzymatic Decarboxylation

Published on: May 22, 2016

10.7K
Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues
07:10

Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues

Published on: February 3, 2023

1.1K

関連する実験動画

Last Updated: Jun 11, 2025

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation
08:00

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation

Published on: October 4, 2024

511
Light-driven Enzymatic Decarboxylation
09:58

Light-driven Enzymatic Decarboxylation

Published on: May 22, 2016

10.7K
Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues
07:10

Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues

Published on: February 3, 2023

1.1K

科学分野:

  • 生物触媒と人工酵素
  • 光化学と再生可能エネルギー
  • 炭素の吸収と利用

背景:

  • 人工酵素は,CO2の減少を触媒化する有望な方法を提供します.
  • CO2変換のための効率的で選択的な触媒の開発は,依然として重要な課題です.

研究 の 目的:

  • 光によるCO2削減のための新しい人工酵素を作成し,特徴づけること.
  • 高活性と選択性をCO2からCOに変換するために,高貴金属のない光システムを使用します.

主な方法:

  • ヘム酸化酵素とコバルト- プロトポルフィリンIXを組み合わせて人工酵素を形成する.
  • 銅ベースの光感受剤を使用し,高貴な金属のない操作を行いました.
  • 反応機構と活性部位を調査するために,光物理学的研究と高解像度の結晶学を用いた.

主要な成果:

  • 3時間後に ~616 h 1 の高回転頻度と ~589 の回転数を達成しました.
  • CO対H2の選択性は72%で,人工CO2還元酵素の新記録を樹立した.
  • 詳細な光物理学的研究により,反応中間物質を特定し,機械的洞察を明らかにした.

結論:

  • 構造的に特徴づけられた人工酵素は,CO2光還元のための優れた活性と選択性を示しています.
  • この高貴な金属のないシステムは,CO2の利用のための人工光合成の重要な進歩を表しています.
  • 構造データに基づくサイト指向型変異は,人工酵素の性能をさらに最適化することができます.