のルシフェラーゼにおけるオキシルシフェリンの興奮状態ダイナミック
Joris J Snellenburg1, Sergey P Laptenok2, Richard J DeSa3
1Faculty of Sciences, Department of Physics and Astronomy, VU University Amsterdam , 1081 HV Amsterdam, The Netherlands.
Journal of the American Chemical Society
|December 22, 2016
まとめ
の生物発光を調査したこの研究では 陽子の移転ではなく 単一の化学物質が オキシルシフェリン-ルシフェラーゼ複合体の pHに依存した色変化を 引き起こしていることが明らかになりました この発見は,マイクロ環境を明確にします.
科学分野:
- 生物化学
- 写真化学
- スペクトロスコーピー
背景:
- ルシフェラーゼ酵素はオキシルシフェリンを通して光を放ち,色の変化はしばしばマイクロ環境効果に起因する.
- 発光に影響を与えるオキシルシフェリンとルシフェラーゼ活性部位の正確な相互作用は不明である.
- 以前の非複合性オキシルシフェリンに関する研究は, in vivo システムへの洞察が限られている.
研究 の 目的:
- のオキシルシフェリンと日本ののルシフェラーゼを複合させた興奮状態のダイナミクスを解明するために.
- 生物発光のスペクトル化学における陽子伝達の役割を調査する.
- 微小環境効果を理解するために,in vitroとin vivoの光スペクトルを比較する.
主な方法:
- オキシルシフェリン/ルシフェラーゼ複合体の安定状態と時間解析スペクトルのグローバルとターゲット解析
- 実験溶液のスペクトルと,in vivoで時間分解された生物発光の比較
- 放射される光に対するpH依存性の分析
主要な成果:
- 解 excitation プロセスは,光誘導によるプロトン移動の複雑なカスケードを含みます.
- 陽子の移転は,システムのスペクトロケミストリーの中心的なイベントとして識別されます.
- 観測されたpH依存性放出は,単一の化学品種に起因することはできません.
結論:
- 陽子伝達ダイナミクスは の生物発光色の変化を理解するために重要です
- 微小環境の効果は,光誘導による陽子移転プロセスと密接に関連しています.
- pHに依存する放出の簡素化された見方は不十分であり,ダイナミックな陽子転送モデルが必要である.
さらに関連する動画
関連する概念動画
Photoluminescence: Fluorescence and Phosphorescence
4.3K
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
4.3K
Deactivation Processes: Jablonski Diagram
2.0K
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
2.0K
Protein Dynamics in Living Cells
2.8K
Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
2.8K
Variables Affecting Phosphorescence and Fluorescence
1.7K
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
1.7K
Flame Photometry: Lab
1.1K
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
1.1K


