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Updated: Sep 9, 2025

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli

Published on: December 9, 2017

アシルキャリアタンパク質の"DSL"モチーフの単一の突然変異は,Eによる vivo のリンパパントエニル化を防ぐことができます. ホロアシルキャリアタンパク質合成体 (AcpS)

Chetna Dhembla¹, Debodyuti Sadhukhan², Rashima Prem²

¹Department of Biochemistry, University of Delhi South Campus, Benito Juarez Road, New Delhi 110 021, India.

|September 3, 2025

まとめ

ミュタゲネシスは,E. コライの望ましくないタンパク質の変異を防ぐ. アシルキャリアタンパク質 (ACP) のD35N変異は,アポ-ACPの発現を可能にする in vivo フォスフォパンテイニレーションを停止します.

科学分野:

生物化学
分子生物学
タンパク質発現

背景:

エシェリキア・コライの発現システムは,高生産性タンパク質の生産に広く使用されています.
保存された生物学的経路は,E. coli酵素によって異質的に発現するタンパク質の意図しない修正につながる可能性があります.
タイプIIアシルキャリアタンパク質 (ACP) は,保存された脂肪酸合成経路により,E. coli 4'-フォスフォパントエニルトランスファーゼ (AcpS) によるフォスフォパントエニル化に敏感である.

研究の目的:

E. coli ACP (AcpP) の残基を特定し,AcpSによる in vivo 変化を防ぐこと.
改変されていないアポ-ACPをE. coliで発現させるための戦略を開発する.

主な方法:

AcpP- AcpS結晶構造に基づくAcpPの構造誘導型変異.
AcpP表面における電荷中和変異 (D35N,E41A,E47A,E48A,E47A/E48A) の設計
酵素活性アッセイと核磁気共鳴 (NMR) を用いたタンパク質変異の評価

主要な成果:

AcpPとAcpSの相互作用を妨害するために5つのAcpP変異体が作られました.
D35Nを除くすべての変異体は,E. coliで部分的なフォスフォパンテイニル化を示した.
D35N変異は,AcpP,mACP,およびIacPのin vivoフォスフォパンテイニレーションを効果的に防止しました.

結論:

D35N変異は,E. coliにおける望ましくない in vivo フォスフォパンテイニレーションを防止する有効な戦略です.
このアプローチは,アポ-ACPのミリグラム量を表すことができます.
"DSL"モチーフのD35N変異は,異なるタイプII ACPで有効である.

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