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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
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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.
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Deactivation Processes: Jablonski Diagram01:25

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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...
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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...

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Electrophysiological Methods for Measuring Photopigment Levels in Drosophila Photoreceptors
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ロドプシンにおける分解活性化イベント

Elena N Laricheva1, Karunesh Arora, Jennifer L Knight

  • 1Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.

Journal of the American Chemical Society
|July 12, 2013
PubMed
まとめ
この要約は機械生成です。

ロドプシン (Rh) のE134のプロトネーションは,活性化時にヘリックスH6の移動と関連しています. このpHに依存するプロセスは,E134を明らかにします.

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科学分野:

  • バイオケミストリー バイオケミストリー
  • 構造生物学 構造生物学とは
  • コンピューティング・バイオフィジックス

背景:

  • クラスAのGタンパク質結合受容体 (GPCR) は,活性化時に重要な構造変化を経験し,螺旋間ネットワークの再編成を伴う.
  • ロドプシン (Rh) では,活性化はグルタミン酸134 (E134) の陽子化状態と結合しているが,その正確な役割は不明である.
  • E134プロトネーションのようなミリ秒,pHに依存するプロセスを研究することは,実験的な課題を提示します.

研究 の 目的:

  • ロドプシン活性化中のE134プロトネーションの基礎となる構造的メカニズムを解明する.
  • E134のプロトネーション状態とヘリックスH6の動きの相互作用を調査する.
  • 原子レベルでロドプシン活性化の既存のモデルを精製する.

主な方法:

  • ハーモニック・フーリエ数珠 (HFB) と定数pHの分子ダイナミクスとpHベースのレプリカ交換 (pH-REX) を組み合わせた計算スキームの開発.
  • E134プロトネーションの関数として活性化経路に沿った構造変化のシミュレーション.
  • 螺旋間ネットワークの再配置と塩橋の動態の分析.

主要な成果:

  • E134のプロトネーションは,ヘリックスH6.6の~4.0°の傾きと~23°の回転によって引き起こされます.
  • H6の動きは塩橋 (E247-R135,R135-E134) を破壊し,E134を放出し,そのpKaを生理的なpHより高くする.
  • 増加した局所的な水性は,さらにH6運動とE134 pKa上位シフトを促進し,結合メカニズムを示しています.

結論:

  • E134プロトネーションスイッチは,ロドプシン活性化中のH6運動の原因と結果である.
  • この研究は,実験的に簡単にアクセスできないpH依存の活性化メカニズムに関する原子レベルの洞察を提供します.
  • 発見は,ロドプシン活性化の配列モデルを洗練し,構造要素のダイナミックな相互作用を強調しています.