合成ペプチドリガゼである

K Severin¹, D H Lee, A J Kennan

¹Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037, USA.

Nature

|October 24, 1997

まとめ

研究者らは,天然の酵素を模倣する合成ペプチド触媒を開発した. この33残基ペプチドは,ペプチド断片の凝縮を効率的に触媒化し,高い選択性と大幅な速度の向上をもたらします.

科学分野:

化学生物学化学生物学とは
合成化学合成化学とは
バイオカタリシスバイオカタリシス

背景:

自然生体ポリマーの触媒効率を備えた合成分子を開発することは,大きな課題です.
タンパク質工学は進歩しているが,高い安定性と反応性を有する合成触媒は依然として難解である.
以前の合成ペプチドは,しばしば構造的整合性と触媒的活性が欠けていました.

研究の目的:

効率的かつ選択的なペプチド結合形成を可能にする新しいペプチド触媒の設計と合成.
巻き巻きのモチーフに基づいた新しいペプチドの触媒活性と効率を調査する.
機能性合成ペプチドの作成における合理的な設計の可能性を実証する.

主な方法:

コイル・コイル構造モチーフを用いた33残基の合成ペプチドの設計.
2つの短いペプチド断片間の凝縮反応の触媒.
速度の向上と触媒効率を決定するために反応運動学の分析.
凝縮産物における配列およびダイアステレオ選択性の評価.

主要な成果:

合成ペプチドは,ペプチド断片の凝縮を効率的に触媒化する.
観察された速度の向上は,非触媒反応と比較して10倍から4,100倍であった.
達成された触媒効率は10^4.4を超えました.
触媒反応において高い配列およびダイアステレオ選択性を示した.

結論:

コイル・コイル構造に基づく合理的に設計された合成ペプチドは,有意な触媒活性を示しています.
この研究は,機能性合成ペプチドのde novo設計における一歩を代表しています.
この発見は,化学生物学の応用のために,安定的かつ反応性のある合成触媒を作成する可能性を支持しています.

さらに関連する動画

11:09

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation

Published on: August 1, 2018

07:11

Constructing Cyclic Peptides Using an On-Tether Sulfonium Center

Published on: September 28, 2022

関連する概念動画

01:01

Phosphodiester Linkages

Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...

02:43

Peptide Bonds

A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...

00:49

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...

02:53

Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...

01:28

Peptidoglycan Synthesis

Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan biosynthesis begins in...

関連する実験動画