セルフ・アセンブリされた多成分カテネン: 多価性と協同性の構造と安定性への影響
Mee-Kyung Chung1, Stephen J Lee, Marcey L Waters
1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA.
Journal of the American Chemical Society
|June 13, 2012
まとめ
この研究では,CH-π相互作用や水素結合などの構造要素が,自己組み立てた [2]-ケテナンの安定性にどのように影響するか,ダイナミック・コンビネタリアル・ケミストリーを用いて調べました. 調査結果は,特定のターンタイプは固定され,変更は予測可能な方法で安定性に影響を与えることを明らかにしています.
科学分野:
- 超分子化学 超分子化学
- 有機化学 オーガニック・ケミストリー
- 化学熱力学 化学熱力学
背景:
- セルフ・アセンブリされた [2]-ケテナンは,様々な分野における潜在的な応用を持つ複雑な分子構造である.
- その安定性を支配する要因を理解することは,その形成を設計し制御するために極めて重要です.
- 以前の研究では,キャテネンの安定性における非共性相互作用の重要性を示唆していた.
研究 の 目的:
- CH-π相互作用,環間の水素結合,βターン型を含む特定の構造要素が,自己組立の [2]-ケイテナンの均衡安定性に与える影響を調査する.
- これらの要因が,動的均衡下にある [2]-カテナンの種化と安定にどのように寄与するかを描写する.
- 分子網における複数の非共性相互作用の協力的効果を探求する.
主な方法:
- ダイナミック・コンビネトリアル・ケミストリーは,ダイペプチド・モノマーの混合物を合成し,研究するために使用されました.
- モノマーは,CH-π相互作用,水素結合,βターンの効果を体系的に探査するために設計されました.
- 変異性研究と3つの構成要素のダイナミック自己組み立て実験は,安定性の変化を分析するために実施されました.
主要な成果:
- [2]-カテナンの核は,特定の位置でのタイプII'とタイプVIIIのβ-ターンのみを採用しており,変更できないことが判明しました.
- CH-π-CHサンドイッチに含まれるAib残留物の改変は,安定性に対する単調な効果を示し,極性ヘテロ原子が不安定化している.
- キークロスリングの水素結合の変異と誘導効果の探求により,電子陰性置換物とCHドナー多様性がCH-π相互作用を強化することが示されました.
結論:
- [2]-カテナンの安定性は,非共性相互作用の複雑な相互作用によって支配され,協力的な結合ネットワークを形成します.
- このネットワークの一部の混乱は,補償またはカスケーディングの不安定化効果につながる可能性があります.
- コア β-ターンのタイプの固定性,CH-π相互作用と水素結合の特定の役割は, [2]-カテナンの安定性の重要な決定因子である.
関連する概念動画
Catenins
Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...
Cooperative Allosteric Transitions
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Stability of Substituted Cyclohexanes
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
Structure of Cadherins
The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins” is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This diversity of cadherins...
Chair Conformation of Cyclohexane
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
Cytoskeletal Accessory Proteins
The cytoskeleton is an essential cell component that plays several structural and functional roles. However, the filaments that make up the cytoskeleton cannot function independently and depend on the accessory or ancillary proteins to effectively carry out their function. Accessory proteins associate with cytoskeletal filaments and their monomers, aiding filament formation and function. They also help in the cross-communication among cytoskeletal filaments. Cytoskeletal accessory proteins are...


