相关实验视频
Updated: Jul 11, 2026

11:48
Detection of Alternative Splicing During Epithelial-Mesenchymal Transition
Published on: October 9, 2014
通过组合性突变发生和选择揭示的EntB载体蛋白的局部蛋白相互作用表面
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
概括
载体蛋白质是聚基合成酶 (PKS) 和非核糖体合成酶 (NRPS) 组合的关键. 在EntB-ArCP上局部的相互作用表面促进酸乙烯转移酶结合,与其他模块相互作用不同.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 酶学 是一种酶学.
背景情况:
- 载体蛋白是聚基合成酶 (PKS) 和非核糖体合成酶 (NRPS) 组装线的重要组成部分.
- 这些蛋白质呈现生物合成中间体,即铁,需要特定的蛋白质-蛋白质相互作用以实现有效的催化.
- 了解这些相互作用对于设计新型PKS和NRPS系统至关重要.
研究的目的:
- 为了识别EntB-aryl载体蛋白 (EntB-ArCP) 上的局部蛋白相互作用表面.
- 研究特定残留物在调解与酸乙烯转移酶 (PPTases) 相互作用中的作用.
- 探索在PKS和NRPS中设计改变的蛋白-蛋白相互作用的潜力.
主要方法:
- 在EntB-ArCP的N端区域的组合性突变发生.
- 在缺乏铁的介质上进行功能性肠杆菌素生产的选择.
- 在蛋白质相互作用中涉及的保存残留物的识别.
主要成果:
- 在EntB-ArCP.上确定了局部蛋白相互作用表面.
- 发现残留物G242和D244形成了PPTases EntD和Sfp的相互作用表面.
- 这种PPTase接口与先前已知的EntF延长模块接口不同.
- 大多数EntB-ArCP表面残留物不参与这些特征相互作用.
结论:
- 对于不同的蛋白质合作伙伴,EntB-ArCP具有不同的相互作用表面.
- 蛋白质成分在肠杆菌素合成酶中识别EntB-ArCP的不同面部.
- 在PKS和NRPS系统中设计非同源载体蛋白相互作用是可以在最小突变的情况下实现的.
相关概念视频
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...

