二元型非リボソームペプチド合成酵素の構造は,形状の柔軟性を明らかにする

Janice M Reimer¹, Maximilian Eivaskhani¹, Ingrid Harb¹

¹Department of Biochemistry and Center de Recherche en Biologie Structurale, McGill University, Montréal, QC H3G 0B1, Canada.

Science (New York, N.Y.)

|November 9, 2019

まとめ

非リボソームペプチド合成酵素 (NRPS) は,治療薬を作る酵素である. グラミシジン合成酵素の構造研究は,ペプチドの生産性を向上させるため,変異体の生成を可能にするモジュール移動を明らかにした.

科学分野:

生化学と構造生物学
自然製品の生物合成
酵素学

背景:

非リボソームペプチド合成酵素 (NRPS) は大きな酵素である.
NRPSは複雑なペプチドを合成するためにモジュラーアーキテクチャを使用します.
これらの酵素は天然の治療薬の生産に不可欠です.

研究の目的:

カタリシス中のNRPSモジュールの構造的動態を解明する.
モジュール構成と基板配送の関係を理解する.
ペプチドの生産を向上させるためのNRPS酵素を設計する.

主な方法:

大型NRPS構造物のX線結晶学
小角X線散射 (SAXS) 分析
サイト・ディレクテッド・ミュータジェネシス・バイオアクティビティ・アッセイ

主要な成果:

グラミシジン合成酵素の5つの結晶構造が決定された.
凝縮と基板の配送を支える形状が観察されました.
モジュールの位置は変化し,触媒サイクルに厳密に縛られていませんでした.
ペプチドの生産性を大幅に改善したミュータントが生成されました

結論:

NRPSモジュールの配置は柔軟で,酵素機能に影響します.
構造的な洞察は,バイオテクノロジーのためのNRPSの合理的な設計を可能にします.
この研究は,NRPS由来治療薬の生産を最適化するための基盤を提供します.

さらに関連する動画

11:44

Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities

Published on: October 2, 2018

13.0K

09:51

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web

Published on: July 16, 2017

15.9K

関連する概念動画

01:25

Protein Folding

10.8K

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 Folding

Intrinsically Disordered Proteins

19.1K

Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...

Protein Organization

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence....

8.9K

01:26

Bacterial Protein Maturation

402

Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...

402

関連する実験動画