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Ionic Crystal Structures02:42

Ionic Crystal Structures

16.7K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
16.7K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.4K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
30.4K
Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

19.1K
Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
19.1K
Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

2.7K
2.7K
Amyloid Fibrils03:03

Amyloid Fibrils

11.5K
Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining,...
11.5K
Protein Organization01:24

Protein Organization

9.0K
Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence....
9.0K

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Updated: Jan 8, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

8.4K

八角形局所秩序を持つ異常なタンパク質性シェル

Sergei B Rochal1, Aleksey S Roshal1, Olga V Konevtsova1

  • 1Southern Federal University, Faculty of Physics, 344090 Rostov-on-Don, Russia.

Physical review. E
|December 23, 2025
PubMed
まとめ
この要約は機械生成です。

通常のウイルスキャプシドとは異なり、異常な構造を持つタンパク質シェルが八角形準結晶として同定された。これらの発見は、これらの新規タンパク質集合体を生物医学で理解し応用するための基礎を提供する。

キーワード:
タンパク質シェル準結晶八角形対称性構造生物学生物医学的応用

さらに関連する動画

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

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関連する実験動画

Last Updated: Jan 8, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

Published on: June 19, 2018

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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Published on: February 10, 2023

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科学分野:

  • 構造生物学
  • 生物物理学
  • 材料科学

背景:

  • タンパク質シェルは、従来の正二十面体ウイルスキャプシドモデルを超えた多様な構造を示す。
  • 異常なシェル構造は、さまざまな生物医学的応用にとって重要である。

研究 の 目的:

  • 新規タンパク質シェル構造の同定と特徴付け。
  • これらのシェルの組み立てと特性を理解するためのモデル開発。

主な方法:

  • シェル構造のタンパク質データバンクの探索。
  • タイリング解析のためのランドー密度波アプローチの利用。
  • 対ポテンシャルを用いた非平衡アセンブリのシミュレーション。
  • タイルの歪みを低減するための有効弾性エネルギーの最小化。

主要な成果:

  • 八角形準結晶に似た9種類の異常なシェルの同定。
  • これらのシェルが八角形タイリングからの立方体ネットであることを実証。
  • 対称酵素を含む多数のタンパク質シェルに適用可能な構造モデルの開発。

結論:

  • 同定された八角形アセンブリは、新しいクラスのタンパク質構造を表す。
  • これらの発見は、将来の応用と類似システムの発見のための基本的な基盤を提供する。
  • 本研究は、タイリング理論、物理学、構造生物学の概念を橋渡しする。