肌球蛋白的氧平衡性质被锁定在结合和不结合的结构中
Naoya Shibayama1, Satoshi Saigo
1Department of Physiology, Division of Biophysics, Jichi Medical School, Yakushiji 3311-1, Minamikawachi, Kawachi, Tochigi 329-0498, Japan. shibayam@jichi.ac.jp
Journal of the American Chemical Society
|March 27, 2003
概括
精子菌血红蛋白的氧结合在凝中被锁定在CO结合或脱氧状态时有所不同. 结合CO的形式显示了简单的氧平衡,而脱氧形式显示了多种构造.
科学领域:
- 生物化学 生物化学
- 蛋白质动力学 蛋白质动力学
- 生物物理学的生物物理.
背景情况:
- 肌球蛋白的氧气平衡对于氧气运输至关重要.
- 了解肌球蛋白的结构状态是其功能的关键.
- 溶凝封装提供了一种在室温下研究蛋白质动态的方法.
研究的目的:
- 为了比较O(2) 平衡曲线的精子菌球蛋白在联结 (CO-绑定) 和非联结 (脱氧) 状态.
- 为了研究肌球蛋白在湿透的多孔溶液-凝二氧化矩阵中固定时的构造状态.
- 阐明蛋白质构成在肌球蛋白的氧结合性质中的作用.
主要方法:
- 囊括精子的肌球蛋白在一个湿的多孔的sol-gel二氧化中.
- 测量O(2) 平衡曲线,用于二氧化碳结合和脱氧肌球蛋白状态.
- 分析平衡数据以确定解离常数和识别构造组件.
主要成果:
- 结合CO的肌球蛋白呈现出一个几乎单相的O2平衡曲线,其解离常数为0.2 Torr.
- 脱氧肌球蛋白表现出多相O2平衡曲线,表明多重构造.
- 脱氧状态可以分解为三个组成部分,分离常数为0.19,0.90和44 Torr.
- 发现肌球蛋白构造依赖于连接体,并在sol-gel矩阵内在室温下稳定.
结论:
- 肌球蛋白可以在室温下在湿的sol-gel中被形状上被困在依赖联体的状态中.
- 脱氧球蛋白存在多种构造,影响其O2结合.
- 溶液中肌球蛋白的O(2) 均衡特性源于对象因子诱导的构型群体的再分配.
相关概念视频
01:13Protein Organization
Overview
01:22Protein Folding
Overview
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...
01:13Protein Organization
Overview
01:24Protein 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.
The primary structure of a protein is its amino acid sequence.
01:24Protein 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.
The primary structure of a protein is its amino acid sequence.