フルダマーとしてのヒドラジノペプチド:ベータペプチド概念の拡張
1Contribution from the Institute of Biochemistry, Faculty of Biosciences, Pharmacy, and Psychology, University of Leipzig, Talstrasse 33, D-04103 Leipzig, Germany.
Journal of the American Chemical Society
|July 18, 2001
まとめ
ベータペプチドの原子の置換によって生成されるヒドラジノペプチドは,新しいヘリクスを含む多様な二次構造を示します. これらのユニークなペプチド構造は,高度なペプチドおよびタンパク質設計の可能性を秘めています.
科学分野:
- * コンピューティング・ケミストリー
- * ペプチドの化学反応
- * 構造生物学について
背景:
- *ベータペプチドは,その多様な二次構造で知られている.
- *ペプチド構造を理解することは,新しいバイオ分子を設計する上で極めて重要です.
研究 の 目的:
- *ヒドラジノペプチドの構成的風景を調査する.
- *ヒドラジノペプチドにおける新しい二次構造を特定する.
- *分子設計におけるヒドラジノペプチドの可能性を評価する.
主な方法:
- * アブ・イニシオ分子軌道 (MO) 理論 (HF/6-31G,MP2/6-31G,DFT/B3LYP/6-31G).
- * 分子力学. 分子力学.
- * ブロックされたヒドラジノペプチドオリゴマーの体系的な形状分析.
主要な成果:
- * ヘリックス,シート,ターンなど,幅広い二次構造の発見.
- *14基の水素結合型シドオサイクルの新しい安定ヘリクスの特定.
- *ヒドラジノペプチドの構造とベータペプチドの構造の比較.
- *ペプチド性NHとCO群は,二次構造要素の鍵となる.
- *ヒドラジノN (α) H群は構造に影響するが,安定性にはそれほど重要ではない.
結論:
- *ヒドラジノペプチドは,新しい形状を含む豊富な構造的多様性を持っています.
- *これらの発見は,ヒドラジノペプチドがペプチドおよびタンパク質設計の有望な候補であることを示唆しています.
- * 環境要因は,ヒドラジノペプチド構造の安定性と存在に影響します.
関連する概念動画
Bronsted-Lowry Acids and Bases
The acid-base reaction class has been studied for quite some time. In 1680, Robert Boyle reported traits of acid solutions that included their ability to dissolve many substances, to change the colors of certain natural dyes, and to lose these traits after coming in contact with alkali (base) solutions. In the eighteenth century, it was recognized that acids have a sour taste, react with limestone to liberate a gaseous substance (now known to be CO2), and interact with alkalis to form neutral...
Lewis Acids and Bases
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
Brønsted-Lowry Acids and Bases
In 1923, the Brønsted–Lowry definition of acids and bases was proposed by Johannes Brønsted and Thomas Lowry. According to this theory, a Brønsted acid is defined as a species that donates a proton in a chemical reaction and gets converted to its conjugate base. A Brønsted base is defined as a species that accepts a proton in a chemical reaction and gets converted into its conjugate acid. These transfers of protons are caused by the displacement of electrons in these reactions, which is...
Lewis Acids and Bases
This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...
Bicarbonate-Carbonic Acid Buffer
The carbonic acid-bicarbonate buffer system is critical for maintaining the body's pH balance. It operates on the equilibrium:
Buffers: Overview
Buffers play a crucial role in stabilizing the pH of a solution by mitigating the effects of small amounts of added acid or base. They consist of a weak acid and its conjugate base or a weak base and its conjugate acid. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl (aq).


