蛋白质折叠位置可以调节结合与铜或结合的关系
Steve Tottey1, Kevin J Waldron, Susan J Firbank
1Cell and Molecular Biosciences, Medical School, Newcastle University, Newcastle NE2 4HH, UK.
Nature
|October 25, 2008
概括
细胞机制通过调节蛋白质折叠的位置来控制蛋白质金属含量. 这项研究确定了蓝藻细菌中特定的和铜蛋白,揭示了蛋白质折叠位置如何决定金属的获取.
科学领域:
- 生物化学和分子生物学
- 细胞生物学 细胞生物学
- 金属蛋白的研究研究.
背景情况:
- 蛋白质需要金属来发挥作用,但大多数蛋白质对金属的获取机制是未知的.
- 对于大多数金属蛋白,金属沙佩龙没有被确定,这表明从细胞池中直接获取.
- 金属与蛋白质的结合亲和力各不相同,正如欧文-威廉姆斯系列所描述的那样,影响金属的获取.
研究的目的:
- 为了研究控制新生蛋白质对金属的获取的细胞机制.
- 为了识别和表征大量的铜和结合蛋白在Synechocystis PCC 6803.3.
- 阐明蛋白质折叠位置在金属含量调节中的作用.
主要方法:
- 在Synechocystis PCC 6803.3中识别Cu(2+) -cupin A (CucA) 和Mn(2+) -cupin A (MncA) 的情况.
- 分析MncA和CucA的金属结合特性和稳定性.
- 研究蛋白质出口途径 (Tat和Sec) 以及它们对蛋白质折叠和金属获取的影响.
主要成果:
- MncA和CucA分别通过cupin折叠中的相同连接体结合Mn{2+) 和Cu{2+).
- 只有在低Cu2+) / Zn2+) 和高Mn2+) 条件下折叠后,MncA才能表现出特定的Mn2+) 结合.
- 蛋白质出口途径决定了折叠位置 (细胞质与周等离子体),超过金属结合偏好.
结论:
- 蛋白质折叠区覆盖了固有的金属结合亲和力,以控制金属蛋白质的组成.
- 这种机制解释了细胞质对铜和的独特金属缓冲要求.
- 这项研究揭示了金属蛋白中细胞金属管理的新策略.
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