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Analytical Techniques for Assaying Nitric Oxide Bioactivity
Published on: June 18, 2012
使用H-NOX域进行氧化的敏感和选择性检测
Elizabeth M Boon1, Michael A Marletta
1Department of Chemistry, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720-1460, USA.
Journal of the American Chemical Society
|August 3, 2006
概括
一种新型的血氧氧化物或氧基结合域 (H-NOX) 蛋白突变体,Tt Y140F,作为基因编码的氧化 (NO) 传感器. 这种稳定,易于生成的蛋白质可以通过吸收光谱学准确检测NO.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- 血氧化物或氧基结合域 (H-NOX) 蛋白质参与感应气体连接体.
- 对像氧化 (NO) 这样的生物相关分子开发基因编码传感器对于研究至关重要.
- 现有的NO传感器在稳定性,易用性或检测范围方面可能存在局限性.
研究的目的:
- 描述一种新型突变H-NOX蛋白,Tt Y140F,作为一种遗传编码的氧化 (NO) 传感器.
- 为了评估Tt Y140F的稳定性,表达和净化.
- 为了确定使用Tt Y140F用于定量NO检测的可行性.
主要方法:
- 来自Thermoanaerobacter tengcongensis的H-NOX蛋白的局部导向突变,以创建Y140F突变.
- 使用标准大肠杆菌系统表达和净化Tt Y140F.
- 光谱分析 (吸收光谱) 用于监测NO结合和蛋白质稳定性.
主要成果:
- 在高产量中成功表达和净化了Tt Y140F.
- 在有氧条件下和高温 (高达70°C) 下,Tt Y140F蛋白在无结合铁和铁-酸形式中表现出异常稳定性.
- 对Tt Y140F的NO结合是定量的,可以通过吸收光谱检测,理论检测范围为300nM至30μM.
结论:
- Tt Y140F代表了一种有希望的,基因编码的氧化 (NO) 传感器.
- 它的高稳定性,易于生产和定量NO检测能力使其成为生物研究中的一个有价值的工具.
- 这种H-NOX突变为在各种实验环境中测量NO度提供了强大的和可访问的方法.
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