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関連する概念動画

Rab Cascades01:25

Rab Cascades

Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
Halogenation of Alkenes02:46

Halogenation of Alkenes

Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
Formation of Halohydrin from Alkenes02:41

Formation of Halohydrin from Alkenes

An alkene, such as propene, reacts with bromine in the presence of water to yield a halohydrin. Halohydrins contain a halogen and a hydroxyl group attached to adjacent carbons. When the halogen is bromine, it is called a bromohydrin, while a chlorohydrin has chlorine as the halogen.
SNAREs and Membrane Fusion01:43

SNAREs and Membrane Fusion

Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene01:14

Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene

Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
Multi-pass Transmembrane Proteins and β-barrels01:09

Multi-pass Transmembrane Proteins and β-barrels

In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as G-protein-linked receptors (GPCRs) and...

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関連する実験動画

Updated: May 13, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

超膜ハロゲン結合カスケード

Andreas Vargas Jentzsch1, Stefan Matile

  • 1Department of Organic Chemistry, University of Geneva, Geneva, Switzerland.

Journal of the American Chemical Society
|March 23, 2013
PubMed
まとめ
この要約は機械生成です。

ハロゲン結合ドナーの線形配列は,硬質の支架上にあり,膜を横断するアニオン輸送を大幅に強化します. このブレークスルーは,以前の設計の限界を克服し,超膜アニオンホッピングの優れた活動と前例のない協力性を達成しました.

さらに関連する動画

Transmembrane Domain Oligomerization Propensity determined by ToxR Assay
06:45

Transmembrane Domain Oligomerization Propensity determined by ToxR Assay

Published on: May 26, 2011

Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies
12:05

Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies

Published on: March 6, 2013

関連する実験動画

Last Updated: May 13, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Transmembrane Domain Oligomerization Propensity determined by ToxR Assay
06:45

Transmembrane Domain Oligomerization Propensity determined by ToxR Assay

Published on: May 26, 2011

Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies
12:05

Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies

Published on: March 6, 2013

科学分野:

  • 超分子化学 超分子化学
  • メンブレーン輸送 メンブレーン輸送
  • 化学生物学 化学生物学とは

背景:

  • ハロゲン結合は,脂質二重層にわたってアニオン輸送のための効果的なツールとして浮上しています.
  • 小型トランスポーターやサイクル配列を用いた以前の設計では,有効性が限られていた.
  • サイクルハロゲン結合ドナーを持つCalix[4]areneエスカファードは,弱い輸送活動をもたらしました.

研究 の 目的:

  • ハロゲン結合ドナーの線形配列が膜横断アニオン輸送に与える影響を調査する.
  • 脂質二重層を横断して効率的なアニオンジャンプを行うための新しい支架を開発する.
  • アニオン輸送システムにおける前例のない協力性を達成する.

主な方法:

  • ハロゲン結合ドナーで機能する硬い棒の支架の設計と合成.
  • これらのスキャフォールドを脂質二重層膜に組み込む.
  • アニオン輸送率の測定と協調性係数の決定.

主要な成果:

  • ハロゲン結合ドナーの線形配列は,硬棒の支架に並べられ,優れたアニオン輸送活動をもたらした.
  • 前例のない協調性係数 (m = 3.37) が達成され,高度に協調的な輸送メカニズムを示しています.
  • この線形配列は,以前のサイクルデザインで観察された劣悪なパフォーマンスを克服します.

結論:

  • ハロゲン結合ドナーの線形配列は,トランスメブラン性硬棒の支架上にあり,アニオン輸送の非常に効果的な戦略です.
  • 観察された協同性は,アニオンジャンプの協同メカニズムが脚架に沿って存在することを示唆しています.
  • この発見は,効率的な人工トランスメブラントランスポーターの設計のための新しい道を開きます.