デッドエンド・エミリテーション定理と,タンパク質のサイドチェーンの位置づけにおけるその使用
J Desmet1, M De Maeyer, B Hazes
1Interdisciplinary Research Center, KU Leuven Campus Kortrijk, B8500 Kortrijk, Belgium.
Nature
|April 15, 2011
まとめ
タンパク質の構造を予測するのは,巨大な構成空間があるため難しい. この研究は,使用不能のサイドチェーン構成を効率的に識別するために,デッドエンドの排除定理を導入し,大規模なタンパク質集合のグローバル最小エネルギー決定を可能にします.
科学分野:
- コンピュータ生物学 コンピュータ生物学
- 構造生物学 構造生物学とは
- タンパク質科学 タンパク質科学
背景:
- タンパク質の三次構造の予測は,依然として重要な計算上の課題である.
- ロタマーグループ化のようなサイドチェーンモデリングの既存の方法は,大規模なシステムでは限界に直面しています.
- 徹底的な検索は,小さなタンパク質単位に限られており,より大きな構造の代替戦略が必要になります.
研究 の 目的:
- 効率的なタンパク質側鎖モデリングのための新しい定理を提示する.
- タンパク質のグローバル最小エネルギー構成を決定する計算の複雑さを解決するために.
- より大きなタンパク質コレクションの三次構造の正確な予測を可能にします.
主な方法:
- "デッドエンドの排除"定理の導入.
- 非最適のロータマーを特定し排除するための条件の開発.
- 定理の適用は,サイドチェーンコンファメーションの検索における組み合わせ複雑性を制御する.
主要な成果:
- デッドエンドの排除定理は,コンフォメーション検索空間を効果的に切り取る.
- ロタマー・コンビネトリアル問題における計算式爆発は,著しく制御されています.
- この方法は,広範囲のサイドチェーン集合体の全局的な最小エネルギー構成の決定を可能にします.
結論:
- デッドエンドの排除定理は,タンパク質構造の予測のための効率的な計算戦略を提供します.
- このアプローチは,大規模なサイドチェーンモデリングのための以前の方法の限界を克服します.
- グローバルな最小エネルギー構造の正確な決定は,より大きなタンパク質システムでも実現可能になりました.
関連する概念動画
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Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
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Overview
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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
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Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
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Termination of Translation
The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...


