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関連する概念動画

Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

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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...
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Protein Complex Assembly02:41

Protein Complex Assembly

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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...
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Protein Folding01:25

Protein Folding

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
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Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

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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...
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Protein-protein Interfaces02:04

Protein-protein Interfaces

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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...
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関連する実験動画

Updated: Jun 2, 2025

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

Published on: November 21, 2013

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本質的に乱れたペプチドの文脈依存的異型集合

Yuchen Qiao1, Ayisha Zia2, Grace Wu1

  • 1Department of Chemistry, Brandeis University, 415 South St., Waltham, Massachusetts 02454, United States.

Journal of the American Chemical Society
|January 14, 2025
PubMed
まとめ

本質的に無秩序なペプチド (IDP) は,文脈依存の組み立てによってナノファイバーを形成することができる. この研究は,アロマティックセグメントを備えた充電されたIDPがどのように自己組み立てられ,新しいナノ材料になるかを明らかにしています.

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Detecting and Characterizing Protein Self-Assembly In Vivo by Flow Cytometry
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Detecting and Characterizing Protein Self-Assembly In Vivo by Flow Cytometry

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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関連する実験動画

Last Updated: Jun 2, 2025

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

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Detecting and Characterizing Protein Self-Assembly In Vivo by Flow Cytometry
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Detecting and Characterizing Protein Self-Assembly In Vivo by Flow Cytometry

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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科学分野:

  • 生物化学
  • 材料科学
  • ナノテクノロジー

背景:

  • 本質的に乱れた領域 (IDR) はタンパク質の機能に不可欠であるが,ペプチド組立設計ではしばしば無視される.
  • 他の分子によって誘発される 文脈依存の相互作用が タンパク質の振る舞いを支配します

研究 の 目的:

  • 本質的に無秩序なペプチドの文脈依存的な異型組立のためのIDRを活用する.
  • IDPを使用して適応性のある多機能ペプチドナノ材料を設計する.

主な方法:

  • アロマティックセグメントを対照的に充電された本質的に無秩序なペプチドに結合する.
  • 構造分析のために冷凍電子顕微鏡 (Cryo-EM) を利用する.
  • 制御されたペプチド添加による組立後の形態学的変化を調査する.

主要な成果:

  • 反対の電荷を持つペプチドは異型ナノファイバーを形成し,同じ電荷を持つペプチドは自己組織化しなかった.
  • Cryo-EMは,βシートコア,形状の異質性,および障害から秩序の連続性を明らかにしました.
  • 組立後の充電ペプチドの添加は,アロマティック残留量に依存する,束を形成する形態学的変化を誘発した.

結論:

  • 本質的に乱れたペプチドの文脈依存の自己組み立てが実証された.
  • 不規則なペプチド組成について 原子学的洞察を提供した.
  • 適応性ペプチドナノマテリアルを設計する簡単な方法を紹介しました