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関連する概念動画

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...
Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
Aquaporins01:25

Aquaporins

Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
Molecular Shapes01:18

Molecular Shapes

Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.Two regions of electron density in a diatomic...

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関連する実験動画

Updated: Jun 1, 2026

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

一次元の分子ジッパーです.

Hyo Won Kim1, Jaehoon Jung, Mina Han

  • 1Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.

Journal of the American Chemical Society
|May 20, 2011
PubMed
まとめ

研究者らはアゾベンゼン誘導体を用いて1次元分子ジッパーを作成した. この研究では,水素結合とヴァン・デル・ワールズの相互作用が金面のジッパー形成を促していることが明らかになりました.

科学分野:

  • 表面科学とは,地表科学である.
  • 超分子化学 超分子化学
  • マテリアルサイエンス 材料科学

背景:

  • 分子ジッパーは自己組み立て構造であり,ナノテクノロジーにおける潜在的な応用がある.
  • その形成を制御する分子間力を理解することは,高度な材料の設計に不可欠です.

研究 の 目的:

  • 一次元の分子ジッパーを形成できる新しいアゾベンゼン誘導体を合成する.
  • 特定の分子間相互作用によって引き起こされる分子ジッパー形成のメカニズムを解明する.

主な方法:

  • オーダーメイドのアゾベンゼン誘導体の合成.
  • スキャニング・トンネル顕微鏡 (STM) を用いて金 ((111)) 表面での表面の特徴付け.
  • 密度関数理論 (DFT) の計算を用いた理論的調査.

主要な成果:

  • アゾベンゼン誘導体の合成が成功しました.
  • Au111) 表面の1次元の分子ジッパー形成の観測.
  • セルフアセンブリの主要な原動力として,シナギスティックな水素結合とヴァン・デル・ワールズの力を特定する.

結論:

さらに関連する動画

A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA
12:05

A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA

Published on: October 1, 2017

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
09:32

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

Published on: April 12, 2019

関連する実験動画

Last Updated: Jun 1, 2026

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA
12:05

A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA

Published on: October 1, 2017

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
09:32

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

Published on: April 12, 2019

  • 合成されたアボベンゼン誘導体は,効果的に一次元分子ジッパーを形成する.
  • この研究は,指向された分子自己組立における結合非共性相互作用の役割に関する根本的な洞察を提供します.