在电子捐赠者有限的环境下,具有直接跨物种电子转移能力的共同培养的生存策略
Guiqin Yang1, Canfen Lin1, Tiqun Hou1
1Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China.
The Science of the total environment
|November 5, 2023
概括
直接跨物种电子转移 (DIET) 是微生物在低能环境中生存的关键. 这项研究表明,当电子捐赠者有限时,DIET成为Geobacter共同培养的首选电子交换方法.
科学领域:
- 微生物学 微生物学
- 环境科学 环境科学
- 生物化学 生化学
背景情况:
- 微生物同取决于物种间的电子交换,直接物种间电子转移 (DIET) 是一个重要的机制.
- 在能源有限的条件下了解 DIET 对于建模自然地下环境至关重要.
研究的目的:
- 在电子捐赠者限制下,研究具有DIET能力的Geobacter共同培养中的代谢动态和电子转移.
- 确定在能源稀缺环境中生存的首选电子转移机制.
主要方法:
- 使用了Geobactermetallireducens和一个突变的Geobacter sulfurreducens的合成共同培养.
- 进行了转录基因分析,以了解不同条件下的基因表达.
- 在乙醇有限和充足条件下分析代谢速率.
主要成果:
- 在电子捐赠者限制下,DIET被证实是突变性培养中首选的电子转移模式.
- 在G. sulfurreducens中,当DIET是唯一的电子源时,吸收酶基因转录被抑制.
- 通过外膜囊泡通过细胞外分泌C型细胞染色体,以克服电子供体限制.
结论:
- 能够适应DIET的同位体社区优先使用DIET在电子捐赠者限制下生存.
- 细胞外细胞染色体分泌是一种应对能源短缺的策略.
- 研究结果提供了对自然和人工系统中的生物地化学过程的见解.
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