関連する実験動画
Updated: Jul 11, 2026

11:48
Detection of Alternative Splicing During Epithelial-Mesenchymal Transition
Published on: October 9, 2014
EntBのキャリアタンパク質の局所的なタンパク質相互作用表面は,組合せ変異と選択によって明らかになりました
Jonathan R Lai1, Michael A Fischbach, David R Liu
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, USA.
Journal of the American Chemical Society
|August 24, 2006
まとめ
キャリアタンパク質は,ポリケチド合成酵素 (PKS) と非リボソームペプチド合成酵素 (NRPS) の組み立ての鍵です. EntB-ArCPの局所的な相互作用表面は,他のモジュール相互作用とは異なり,フォスフォパントエニルトランスファーゼ結合を促進します.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 酵素学 酵素学とは
背景:
- キャリアタンパク質は,ポリケチド合成酵素 (PKS) と非リボソームペプチド合成酵素 (NRPS) の組み立てラインの不可欠な構成要素です.
- これらのタンパク質はチオエステルとして生物合成中間物質を提示し,効率的な触媒化のために特定のタンパク質-タンパク質相互作用を必要とします.
- これらの相互作用を理解することは,新しいPKSとNRPSシステムを設計する上で極めて重要です.
研究 の 目的:
- EntBアリルキャリアタンパク質 (EntB-ArCP) の局所的なタンパク質相互作用表面を特定する.
- フォスフォパントエニルトランスファーゼ (PPTases) との相互作用を媒介する特定の残留物の役割を調査する.
- PKSおよびNRPSにおける変異したタンパク質-タンパク質相互作用の設計の可能性を調査する.
主な方法:
- EntB-ArCP.のN末端領域の組み合わせ変異.
- 鉄欠乏介質での機能的なエンテロバクチン産生のための選択.
- タンパク質の相互作用に関与する保存された残留物の特定.
主要な成果:
- EntB-ArCP.で局所化されたタンパク質相互作用表面が特定されました.
- 残留物G242とD244は,PPTases EntDとSfpの相互作用表面を形成することが判明しました.
- このPPTaseインターフェイスは,EntF延長モジュールの以前に知られているインターフェイスとは異なります.
- EntB-ArCPの表面残留物のほとんどは,これらの特徴づけられた相互作用には関与していません.
結論:
- EntB-ArCPは,異なるタンパク質パートナーに対して異なる相互作用表面を有しています.
- タンパク質成分は,エンテロバクチン合成酵素内のEntB-ArCPの異なる面を認識する.
- PKSおよびNRPSシステムにおける非同性キャリアタンパク質の相互作用を設計することは,最小限の変異で実現可能である.
関連する概念動画
Protein Folding
Overview
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
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...
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...
Vesicular Tubular Clusters
After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...
With the help of motor proteins such...
Selectins
Cell adhesion is an essential aspect of multicellularity. While stable cell interactions usually occur between cells of the same type, transient cell interactions occur between cells of different tissue types, such as between neutrophils and endothelial cells. Selectins are one class of cell adhesion molecules (CAMs) that bind carbohydrate ligands to form transient cell adhesion. They are rod-like proteins with a long extracellular part of variable length ending with the lectin domain, which...
Diversity of Antigen Receptors
Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...

