タンパク質とタンパク質の相互作用における乱交性と選択性の熱力学的基礎:PDZドメイン,ケーススタディ
Nathalie Basdevant1, Harel Weinstein, Marco Ceruso
1Department of Chemistry, CUNY College of Staten Island, 2800 Victory Boulevard, Staten Island, NY 10314, USA.
Journal of the American Chemical Society
|September 28, 2006
まとめ
PDZドメインはペプチドを結合することによって重要な細胞プロセスを媒介する. 分子ダイナミクスシミュレーションは,好ましい非極性相互作用と変数ダイナミクスが,PDZドメインの乱交性とタンパク質結合の選択性に寄与することを明らかにしています.
科学分野:
- 分子生物学は分子生物学である.
- バイオフィジックス 生物物理学
- 計算生物学とは,計算生物学である.
背景:
- PDZドメインは,細胞プロセスにおける多タンパク質複合体の組み立てに不可欠です.
- 標的タンパク質に特定のペプチドモチーフを結合するが,様々な結合体と相互作用することもあり,根本的なメカニズムに関する疑問を提起する.
研究 の 目的:
- PDZドメインの乱交性および選択性の分子および熱力学的基礎を調査する.
- 異なるペプチドリガンドとのPDZドメイン相互作用の変動源を特定する.
主な方法:
- 12種類のPDZドメイン複合体で分子動力学シミュレーション (20-25 ns) を実施しました.
- MM/PBSAおよび準調和分析を用いた静電,非極性,および構成エントロピーの貢献を評価した.
主要な成果:
- PDZドメインの相互作用は,電静的影響が最小限で有利な非極性寄与によって支配され,潜在的に乱交を可能にします.
- 構造的な類似性にもかかわらず,異なるPDZドメインとリガンドにおいて,エントロピーとダイナミック結合の側面の有意な変動が観察されました.
結論:
- 非極性相互作用とダイナミック・ヴァイアビリティの相互作用は,乱交的結合と選択的結合の両方のPDZドメインの二重能力を説明する可能性がある.
- エントロピックおよびダイナミック要因は,PDZドメイン-リガンド相互作用における選択性の主要な決定因子であると示唆されています.
関連する概念動画
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...
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...
Noncovalent Attractions in Biomolecules
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Ligand Binding Sites
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Conserved Binding Sites
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...


