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関連する概念動画

Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Formation of Intermediate Filaments00:57

Formation of Intermediate Filaments

Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been reported.
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: May 27, 2026

Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
07:26

Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides

Published on: November 21, 2013

分子構造はナノスケールアセンブリをコードする: 静電自己アセンブリの原動力を理解する.

Immanuel Willerich1, Franziska Gröhn

  • 1Department of Chemistry and Pharmacy and Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-University Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany.

Journal of the American Chemical Society
|November 5, 2011
PubMed
まとめ

研究者らは,超分子ナノ粒子サイズと結合自由エネルギーとの間の定量的なリンクを確立しました. 染料と染料の相互作用は,分子設計を通じてナノ粒子の形成とサイズを制御するための鍵です.

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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles

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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
08:00

DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

Published on: October 25, 2017

関連する実験動画

Last Updated: May 27, 2026

Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
07:26

Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides

Published on: November 21, 2013

Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
08:39

Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles

Published on: October 16, 2017

DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

Published on: October 25, 2017

科学分野:

  • 超分子化学とは
  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー

背景:

  • 超分子ナノ粒子は自己組み立てによって合成され,外部のトリガーに反応することができます.
  • 構造を制御する要因を理解することは,これらのナノ粒子の標的型設計に不可欠です.

研究 の 目的:

  • 超分子ナノ粒子サイズと自由結合エネルギーとの定量的な関係を示す.
  • ナノ粒子の形成とサイズに影響を与えるアゾ染料の構造特性を特定する.

主な方法:

  • 有機染料分子によるカチオンのポリエレクトロライトデンドリマーの静電自組成.
  • アゾ染料を媒介する硫酸塩基の合成.
  • 光の散乱, ζ-ポテンシャル測定,同熱タイトリング熱計 (ITC),UV-VISスペクトロスコーピー.

主要な成果:

  • 20 nm < R(H) < 50 nm の水力力学半径と正の ζ-ポテンシャル値が観察されました.
  • dendrimer の相互接続には,最小自由エネルギー獲得 ΔG ≈ -32 kJ mol−1 が求められます.
  • 染料と染料の相互作用は,粒子の大きさを制御する主要な要因として特定されました.

結論:

  • 自由エネルギーと粒子の大きさに関する定量モデルが開発され,熱力学的測定に基づく予測が可能になりました.
  • 分子構成ブロックは,超分子組成のサイズを制御するように設計することができます.
  • この研究は,予測可能なサイズを持つ超分子ナノ粒子の標的型設計を容易にする.