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Updated: May 20, 2025

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在生态多样化的Desulfobacterotaota中独立进化了细胞外电子转移通路

Dario R Shaw¹, Krishna P Katuri¹, Veerraghavulu Sapireddy¹

¹Biological and Environmental Science & Engineering (BESE) Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.

The ISME journal

|May 17, 2025

概括

这项研究揭示了Desulfuromonas acetexigens细菌共同表达了多个细胞外电子转移通路. 这一发现扩大了我们对微生物电子转移及其生物技术潜力的理解.

科学领域:

微生物学微生物学
生物化学生物化学
环境科学环境科学

背景情况:

细胞外电子转移 (EET) 对生物地球化学循环和生物技术应用至关重要.
关键的EET通路包括金属降解 (Mtr),外膜细胞染色体 (Omc) 和毛孔细胞染色体 (Pcc),它们在遗传学上是不同的.
这些通路通过跨外膜细胞染色体复合体促进电子转移到不溶性电子受体.

研究的目的:

为了研究高电流产生细菌Desulfuromonasacetexigens的细胞外电子转移机制.
探索Mtr,Omc和Pcc通路在Desulfobacterota物种中的共同表达.
识别新的降解金属的蛋白质,并评估在不同的生态环境中EET路径的多样性.

主要方法:

在EET条件下对D.acetexigens中Mtr,Omc和Pcc通路的差异转录和蛋白质水平分析.
对40多种Desulfobacterota物种进行生物信息分析,以确定EET通路基因.
对新发现的减少金属的蛋白质进行了基因分析.

主要成果:

在EET条件下,desulfuromonasacetexigens与高分子量细胞染色体 (高达86个半球) 一起差异地共同表达Mtr,Omc和Pcc通路.
发现超过40个Desulfobacterota物种编码Omc和Mtr通路,大多数也表达Pcc通路.
在Desulfobacterota中发现了一种新型的减少金属蛋白的主要血统,扩大了已知的蛋白质多样性.
在Desulfobacterota中没有发现mtrCAB基因,这些遥远的通路的同时表达以前没有报告过.

结论:

细胞外电子转移途径在微生物种群中比以前认为的更广泛.
在D. acetexigens中同步表达的基因学上遥远的EET通路突出显示了微生物的多功能性.
这些发现具有重要的生态影响,并揭示了生物技术应用的新机遇.

关键词:

脱硫细菌的存在脱硫胺酸是一种非硫化合物.电活性细菌是一种电活性细菌.电子运输是一种电子运输.细胞外电子转移细胞外电子转移减少铁的细菌减少铁的细菌多基因细胞染色体多基因细胞染色体

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