碳水化合物对葡萄糖-银糖结合蛋白的亲和力是由全域运动调节的
Gabriel Ortega1, David Castaño, Tammo Diercks
1Structural Biology Unit, CIC bioGUNE, Bizkaia Technology Park, Building 800, 48160 Derio, Spain.
Journal of the American Chemical Society
|November 15, 2012
概括
蛋白质动态影响功能. 研究人员研究了两个糖结合蛋白,发现GGBP中的细分运动增强了连接体结合,与RBP不同,证明了链控制的全调节.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 蛋白质动力学 蛋白质动力学
背景情况:
- 蛋白质的功能,结构和动态密切相关.
- 对于结构-活动关系至关重要的功能动力学往往被低估.
研究的目的:
- 研究同类周等离子体糖结合蛋白的功能动态.
- 阐明细分移动性和链组成在蛋白质功能中的作用.
主要方法:
- 使用了核磁共振 (NMR) 光谱学.
- 对大肠杆菌葡萄糖/银糖结合蛋白 (GGBP) 和核糖结合蛋白 (RBP) 的比较分析.
- 位点定向的突变发生是为了在GGBP和RBP之间交换关键链残留物.
主要成果:
- 在GGBP和RBP之间观察到功能动态的显著差异.
- RBP表现出有限的细分运动,与诱导适合机制一致.
- 在apo和holo状态中,GGBP显示了广泛的细分流动性,支持人口转移机制.
- 突变性研究证实,链区域残留物控制细分移动性和相关的结构变化.
- 发现细分域间动态增强了明显的基质亲和力.
结论:
- 链组成决定了细分动力学,并影响了蛋白质构造选择.
- 细分动力学在带结合的全调节中起着功能性作用.
- 该研究强调了蛋白质动态在调节基质亲和和结合机制方面的重要性.
相关概念视频
Cooperative Allosteric Transitions
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Allosteric Regulation
Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...
Allosteric Regulation
Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...
Allosteric Proteins-ATCase
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...


