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関連する概念動画

Protein and Protein Structure02:15

Protein and Protein Structure

Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...
Amyloid Fibrils03:03

Amyloid Fibrils

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, normally used to...
Protein-protein Interfaces02:04

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
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...
Protein-Protein Interfaces02:04

Protein-Protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
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...

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関連する実験動画

Updated: Jul 8, 2026

Synthesis of an Intein-mediated Artificial Protein Hydrogel
15:06

Synthesis of an Intein-mediated Artificial Protein Hydrogel

Published on: January 27, 2014

設計されたタンパク質インターフェースで,繊維の形成を阻害します.

Ushma J Shukla1, Heather Marino, Po-Ssu Huang

  • 1Department of Chemistry, San Diego State University, 5500 Campanile Drive, San Diego, California 92182-1030, USA.

Journal of the American Chemical Society
|October 28, 2004
PubMed
まとめ
この要約は機械生成です。

エンジニアリングされたタンパク質モノマー-Bはアミロイド繊維を形成しますが,このプロセスは設計されたパートナーであるモノマー-Aによってブロックされます. このエンジニアリングされた相互作用は,疾患およびナノ構造の発達におけるタンパク質繊維の形成を研究し,抑制するためのモデルを提供します.

さらに関連する動画

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
10:23

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles

Published on: May 8, 2015

Nanofibrillar Basement Membrane Mimic Made of Recombinant Functionalized Spider Silk in Custom-Made Tissue Culture Inserts
06:17

Nanofibrillar Basement Membrane Mimic Made of Recombinant Functionalized Spider Silk in Custom-Made Tissue Culture Inserts

Published on: November 1, 2024

関連する実験動画

Last Updated: Jul 8, 2026

Synthesis of an Intein-mediated Artificial Protein Hydrogel
15:06

Synthesis of an Intein-mediated Artificial Protein Hydrogel

Published on: January 27, 2014

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
10:23

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles

Published on: May 8, 2015

Nanofibrillar Basement Membrane Mimic Made of Recombinant Functionalized Spider Silk in Custom-Made Tissue Culture Inserts
06:17

Nanofibrillar Basement Membrane Mimic Made of Recombinant Functionalized Spider Silk in Custom-Made Tissue Culture Inserts

Published on: November 1, 2024

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
  • バイオフィジックス 生物物理学

背景:

  • タンパク質繊維の形成は,様々な病気に関連しています.
  • 計算型タンパク質工学は,タンパク質集積の阻害剤を開発することを目的としています.
  • 以前に設計されたタンパク質システムでは,1つのモノマーによって意図せぬ繊維の形成が示された.

研究 の 目的:

  • エンジニアリングされたモノマー-Bのアミロイド特性を特徴づけるために.
  • モノメア-Aの設計結合パートナーであるモノメア-Aによるモノメア-Bフィブリル形成の抑制を調査する.
  • タンパク質繊維の形成と抑制を研究するためのモデルシステムを確立する.

主な方法:

  • トランスミッション電子顕微鏡 (TEM) で,繊維を視覚化します.
  • チオフラビンT (ThT) 光測定法で,アミロイド形成を検出する.
  • 変化するpH,タンパク質濃度,種まきに関する運動学的研究.

主要な成果:

  • モノマー-Bはアミロイド型繊維を形成し,TEMとThTの光によって確認されています.
  • 線維細胞形成の動態は,pH,濃度,シードに左右されます.
  • モノメア-Aは,すべての試験条件下でモノメア-B繊維の形成を特異的に抑制した.
  • ワイルド型タンパク質-Gは,モノマー-B線維細胞の形成を阻害せず,相互作用特異性を示した.

結論:

  • エンジニアリングされたモノマー-Bは,強固なアミロイド特性を示しています.
  • 設計されたヘテロディメア相互作用は,繊維の形成を効果的に阻害します.
  • このシステムは,アミロイド疾患の研究とナノ構造の開発に貴重なモデルとして役立つ.