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Protein-protein Interfaces

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...

Protein Complexes with Interchangeable Parts

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...

Protein Complex Assembly

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...

Protein Complexes with Interchangeable Parts

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...

Bacterial Protein Maturation

Bacterial Protein Maturation

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...

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Updated: Jul 6, 2026

Engineering Cell-permeable Protein

Engineering Cell-permeable Protein

Published on: December 28, 2009

エンジニアリングによる結合タンパク質の適合安定化.

Elisabet Wahlberg¹, Torleif Härd

¹School of Biotechnology, Royal Institute of Technology (KTH), S-106 91 Stockholm, Sweden.

Journal of the American Chemical Society

|June 8, 2006

まとめ

ディスルファイド工学は,特定の形状を安定させることで,結合タンパク質の親和性を大幅に高めました. この安定化により,結合エンタルピーとエンタルピー-エントロピーの補償が改善され,結合親和性が数桁増加しました.

科学分野:

プロテイン工学は,タンパク質の
生物物理化学生物物理化学とは
分子生物学は分子生物学である.

背景:

Z ((SPA) ((-))) のアフィボディは,Zドメインのパートナーに対して,中程度の結合親和性 (K ((d) = 1.6 μM) を示す.
以前の研究では,インターフェースの制限ではなく,構造的異質性が,この適度な親和の根底にあることを示唆していました.

研究の目的:

ディスルファイド工学による結合タンパク質の親和性を改善するための熱力学的基礎を調査する.
Z ((SPA) ((-) ((1)) のアフィボディとZドメインのパートナーとの結合親和性を高めるために.

主な方法:

ディスルファイド工学は,安定したZ ((SPA) (((-) ((1) ダブルシステインミュータントを作成するために使用されました.
結合親和性は,解離定数 (K ((d)) を使用して測定されました.
結合の熱力学分析を行い,構成エントロピー,溶解エントロピー,結合エンタルピーを調べました.

主要な成果:

安定した5つのZ(SPA)(-)(1) ミュータントは,K(d) = 130 nMに達し,近親性の大きさの順位の改善を示しました.
熱力学的分析により,形状と溶解のエントロピーの変化の間のバランスが明らかになった.

さらに関連する動画

Synthesis of an Intein-mediated Artificial Protein Hydrogel

Synthesis of an Intein-mediated Artificial Protein Hydrogel

Published on: January 27, 2014

OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy

OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy

Published on: February 5, 2020

関連する実験動画

Last Updated: Jul 6, 2026

Engineering Cell-permeable Protein

Engineering Cell-permeable Protein

Published on: December 28, 2009

Synthesis of an Intein-mediated Artificial Protein Hydrogel

Synthesis of an Intein-mediated Artificial Protein Hydrogel

Published on: January 27, 2014

OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy

OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy

Published on: February 5, 2020

より高い結合親和度は,より有利な結合エンタルピーとエンタルピー-エントロピー補償と相関する.

結論:

タンパク質-タンパク質結合親和性は,ジスルファイド工学による特定のタンパク質構成の安定化によって著しく改善することができます.
形状を安定させることで,結合中の好ましいエンタルピック効果をよりよく探求することができます.
ディスルフィード工学は,治療用途のためのアフィボディ親和性を高めるための実行可能な戦略を提供します.