生物膜モデルにおけるキラル認識のスイッチとしてのpH変動

Francesca Ceccacci¹, Giovanna Mancini, Alessio Sferrazza

¹Dipartimento di Chimica, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, 00185 Roma, Italy.

Journal of the American Chemical Society

|October 6, 2005

まとめ

生物膜モデルにおけるキラル認識は,N-ドデシル-l-プロリンミセルを用いて達成された. これらの集積物は,ラセミ混合物をエナティオメリックに濃縮された溶液に効果的に変換し,重要なキラル差別を示した.

科学分野:

超分子化学超分子化学
チラルの化学
バイオミメティック・システム

背景:

ヒラルの認識は,生物学的システムにおいて極めて重要です.
キラルの認識のための人工システムの開発は,依然として課題です.
生物膜モデルは,キラル相互作用を研究するための有望なプラットフォームを提供します.

研究の目的:

生物膜モデルでキラル認識を調査する.
N-ドデシル-l-プロリンミセルアグレガットの脱血能力の評価.
キラル認識とエナティオメア濃縮に対するpHの影響を調査する.

主な方法:

N-ドデシル-l-プロリンを用いたミセラ・アグレガートの形成.
ラセミカルビフェニル誘導体の混合物の変換.
キラル静止相における高性能液体染色法 (HPLC) を使用したエナティオメア濃縮の分析.
ステレオケミカルバイアスのpH依存の影響に関する調査.

主要な成果:

N-ドデシル-l-プロリンミセルは,ラセミック混合物をエナティオメリックに濃縮された溶液に成功裏に変換しました.
観察された脱血化の程度は,類似のシステムで報告された最も高いものであった.
エナティオメア濃縮と構成はpHに依存し,可逆であった.
最大のエナティオメア過剰はpH7で観察され,pH13で構成の逆転が観察されました.

結論:

N-ドデシル-l-プロリンミセラアググレガートは,キラル認識のための効果的なバイオメンブランモデルとして機能します.
このシステムは,pH調節を通じて調節可能なステレオケミカルバイアスを実証しています.
この研究は,生物模倣システムのエナチオセレクティブ合成と分離の可能性を強調しています.

さらに関連する動画

13:05

Ratiometric Imaging of Extracellular pH in Dental Biofilms

Published on: March 9, 2016

11:54

Optical Quantification of Intracellular pH in Drosophila melanogaster Malpighian Tubule Epithelia with a Fluorescent Genetically-encoded pH Indicator

Published on: August 11, 2017

関連する概念動画

01:24

The potential of hydrogen (pH) is a measure of the acidity or basicity of a water-based solution determined by the concentration of hydronium ions (H3O+). In one liter of pure water at neutral pH, there are 1×10−7 moles of hydronium ions. However, the extensive range of hydronium ion concentrations present in water-based solutions makes measuring pH in moles cumbersome. Therefore, a pH scale was developed to convert moles of hydronium ions into the negative logarithm of the hydronium ion...

02:41

pH Scale

Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...

01:24

01:21

Stomach pH Regulation

The human body carefully regulates the internal pH of different organs to maintain homeostasis. For example, while the blood plasma maintains a neutral pH of 7, the stomach lumen has an acidic pH of 1.5 - 3.5. The low pH of stomach lumen helps kill pathogens in the food and break down complex food molecules.
The acid-secreting gastric mucosal epithelial cells (parietal cells) lining the stomach lumen maintain the low pH in the lumen. Numerous ion transporters and channels on these parietal...

01:28

pH Regulation in Cells

pH plays a critical role in maintaining normal cellular activities. It helps maintain the structure and function of various proteins, dictates the charge on cellular membranes, and is crucial for metabolic reactions inside the cell. Moreover, cells use the energy from the proton motive force to generate ATP.
Cytosolic pH
Under physiological conditions, the cytosolic pH is slightly more acidic than the extracellular pH. However, cells must prevent further acidification of their cytosol to...

01:29

Factors Influencing Microbial Growth: pH

Microorganisms are classified as acidophiles, neutrophiles, or alkaliphiles based on their pH growth preferences, reflecting their adaptations to specific environments. Maintaining a stable intracellular pH is critical for macromolecular stability and enzymatic activity, which can be challenged by external pH variations.Neutrophiles, such as Escherichia coli, grow optimally between pH 5.5 and 8.0. These microorganisms inhabit neutral or slightly acidic environments and employ mechanisms like...

関連する実験動画