从生物分子到生物地球化学:探索土著细菌与黄金的相互作用
Santonu K Sanyal1, Tara Pukala2, Parul Mittal3
1School of Earth, Atmosphere and Environment, Monash University, Clayton, Victoria, 3800, Australia.
Chemosphere
|August 5, 2023
概括
黄金颗粒上的微生物可以溶解和再生金属,影响其环境行为. 这项研究表明,Serratia proteamaculans修复细胞损伤,并在对黄金的反应中中和毒素,形成不那么有毒的黄金纳米粒子.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 生物地质化学生物地质化学
背景情况:
- 黄金颗粒上的微生物群落影响黄金的环境流动性和毒性.
- 塞拉提亚蛋白质菌 (Serratia proteamaculans) 是第一个从天然黄金颗粒中分离出来的代谢活性细菌.
研究的目的:
- 研究Serratia proteamaculans在暴露于有毒水平的可溶黄金 (Au3+) 时的蛋白质和生理反应.
- 为了比较黄金对无金属对照和铜 (Cu2+) 暴露的反应.
主要方法:
- 对暴露于10 μM Au3+和0.1 mM Cu2+的Serratia proteamaculans进行蛋白质组学分析.
- 黄金暴露,铜暴露和对照培养之间的蛋白质表达特征的比较.
主要成果:
- 暴露于可溶性黄金上调了Serratia proteamaculans中的139种蛋白质 (51%),其中54%的功能与铜反应不同.
- 上调蛋白主要涉及新陈代谢,生物发生,细胞过程和信号传递,表明一种特定的黄金反应.
- 细菌合成了用于氧化应激反应和细胞损伤修复的蛋白质,从而形成了毒性较低的金属金纳米粒子.
结论:
- 塞拉蒂亚蛋白质通过修复细胞损伤和中和活性氧物种 (ROS) 来减轻黄金毒性.
- 本土细菌可以通过蛋白质修复和抗氧化剂合成来调解黄金毒性.
- 这项研究为黄金生物回收和生物修复中的生物技术奠定了基础.
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