サイクルペプチドミメティクスにおけるベータターン形状の酸化誘導:形状分析が構成の指標として
1Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842-3012, USA.
Journal of the American Chemical Society
|August 1, 2002
まとめ
サイクルペプチドミメティックスを合成し,その溶液構成を分析した. スルフォンとエピメリックスルフォキシドの類型は,硫化物と非エピメリックスルフォキシドの類型とは異なり,ベータターン構造を採用した.
科学分野:
- 有機化学 オーガニック・ケミストリー
- 薬用化学 薬用化学について
- 構造生物学 構造生物学とは
背景:
- ペプチドミメチックは,ペプチド構造を模倣する薬剤の発見において極めて重要です.
- ペプチドミメティックスの構造的好みを理解することは,効果的な治療法を設計するための鍵です.
- ベータターンはペプチドとペプチドミメティックにおける重要な二次構造である.
研究 の 目的:
- 新型循環ペプチドミメティックスを合成する.
- 溶液中のこれらの化合物の構成的振る舞いを調査する.
- 二次構造の採用における特定の機能群 (硫化物,硫酸化物,硫) の影響を決定する.
主な方法:
- 周期性ペプチドミメティックスの固体相合成 1〜4.
- 顕微鏡技術 (例えば,NMR) を用いた溶液状態構成分析.
- コンフォメーションの割り当てをサポートする計算モデリング.
主要な成果:
- 周期性ペプチドミメティック1 (硫化物) と3 (硫化物) は,ベータ・ターン・コンフォーメーションへの限られた傾向を示した.
- 周期性ペプチドミメティック2 (スルフォン) と4 (エピメリックスルフォキシド) は,ベータターン構造を採用する強い傾向を示した.
- 適合分析により,硫黄酸化物化合物のステレオ化学的構成を割り当てる事ができました.
結論:
- スルフォンとエピメリックスルフォキシドの分子は,これらの周期性ペプチドミメティックにおけるベータ回転形状を著しく安定させる.
- 形状の好みは,硫黄原子の酸化状態とステレオ化学によって影響を受けます.
- これらの発見は,治療応用のための予測可能な二次構造を持つペプチドミメティック薬の設計に関する洞察を提供します.
さらに関連する動画
関連する概念動画
01:22Protein Folding
Overview
02:11Conformations of Cyclohexane
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
02:02Chair 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...
00:52¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
01:25Protein 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...
01:15¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.