ベータシート折り畳みエネルギーに対するバックボーン水素結合の文脈に依存する貢献
Songpon Deechongkit1, Houbi Nguyen, Evan T Powers
1Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, BCC 506, La Jolla, California 92037, USA.
Nature
|July 2, 2004
まとめ
この研究は,骨幹の水素結合がタンパク質の折り畳みにどのように影響するかを明らかにしています. PIN WWドメインのアミドをエステルに置き換えることで,水害性クラスター内のH結合を混乱させると,タンパク質が最も不安定になることが示されました.
科学分野:
- タンパク質の構造とダイナミクス
- 生物物理化学 生物物理化学とは
- 分子生物学は分子生物学である.
背景:
- 背骨の水素結合 (H結合) は,タンパク質構造に不可欠です.
- タンパク質の折りたたみにおけるそれらの正確な役割は,伝統的な変異遺伝子の限界のために議論されています.
- H-ボンドの貢献を理解することは,タンパク質の折りたたみメカニズムを解読する鍵です.
研究 の 目的:
- タンパク質の折りたたみ動力学と熱力学へのバックボーンH結合の貢献を調査する.
- アミドからエステルへの変異をサイト固有のH結合の混乱のために利用する.
- PIN WWドメインの折り畳み経路を解明する.
主な方法:
- 基幹アミドをエステルで置き換えるサイト固有の変異.
- PIN WWドメインのための19のアミド-エステル変異体の合成.
- 変異したタンパク質の変異体の熱力学および運動学的分析.
主要な成果:
- タンパク質の不安定化は,水害性クラスター内のH結合が混乱したときに最大であった.
- 動力学的研究により,折り畳みの移行状態中にループで二次構造の形成が明らかになった.
- 脊椎の順序は,移行状態のシーケンス全体で変化した.
結論:
- 背骨のH結合は,タンパク質の折り畳みの熱力学と運動学に大きく影響を与えます.
- 水性相互作用は,タンパク質構造内のH結合の安定化において重要な役割を果たします.
- この研究は,βシートタンパク質の折り畳みプロセスに関する詳細な洞察を提供します.
関連する概念動画
Protein Folding
Overview
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,...
Protein Folding
Overview
Protein Folding
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...
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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,...
Hydrogen Bonds
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...


