通过菌体显示器在卷状卷轴二次体中重新打包疏水性核心:了解蛋白质-蛋白质接口上的可塑性和特异性
Jonathan R Lai1, John D Fisk, Bernard Weisblum
1Graduate Program in Biophysics, University of Wisconsin, Madison, Wisconsin 53706, USA.
Journal of the American Chemical Society
|August 26, 2004
概括
这项研究揭示了疏水核中的固体匹配驱动了卷轴-卷轴蛋白相互作用. 体显示识别了新的异构聚合物对,提供了对蛋白质特异性和设计的见解.
科学领域:
- 蛋白质的生物化学 蛋白质的生物化学
- 结构生物学是结构生物学.
- 分子相互作用分子相互作用.
背景情况:
- 卷曲-卷曲是由交织的α-螺旋体形成的蛋白质结构.
- 卷轴-卷轴中的配对特异性通常归因于静电相互作用.
- 固体匹配在疏水性核心中的作用仍然不太被探索.
研究的目的:
- 为了研究体匹配作为卷轴-卷轴特异性的驱动因素.
- 使用菌体显示器识别新型卷状卷状异构体.
- 了解核心残留物相互作用对蛋白质二元化的贡献.
主要方法:
- 利用菌体显示器来选一个不稳定的卷轴突变体中的补偿突变.
- 在已知异构体的疏水核中引入了一种Leu to Ala突变.
- 评估了新发现的异构聚合物对的稳定性和特异性.
主要成果:
- 确定了一种新型,稳定的异构聚合物对,其序列与已知的二元相似.
- 证明了一个核心突变 (Leu->Ala) 诱导了对菌素衍生的伴侣的特异性.
- 菌体显示成功地揭示了卷轴-卷轴核心相互作用中的硬质偏好.
结论:
- 非极性核心侧链之间的立体匹配是卷轴-卷轴配对选择性的重要因素.
- 菌体显示器是发现蛋白质相互作用偏好的强大工具.
- 这些发现有助于分析自然的卷轴-卷轴序列,并设计直角二元化图案.
相关概念视频
01:22Protein Folding
Overview
00:58DNA Packaging
Overview
01:10Antibody Structure
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
02:15Protein and Protein Structure
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...
A protein's shape is critical to its function. For example, an enzyme can...
01:10Antibody Structure
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
01:26Bacterial 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...