The plant pathogen Pectobacterium atrosepticum contains a functional formate hydrogenlyase-2 complex

The plant pathogen Pectobacterium atrosepticum contains a functional formate hydrogenlyase-2 complex
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植物病原体黑腐果杆菌含有功能性甲酸氢解酶 2 复合物

DOI:
10.1101/688135
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发表时间:
2019
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通讯作者:
Finney A
Finney A
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作者:
Finney A

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黑败血性果胶杆菌SCRI 1043是一种植物病原性革兰氏阴性肠杆菌。基因组分析已经确定呼吸和发酵所需的基因在厌氧条件下表达。一组厌氧表达的基因被预测编码一种重要但知之甚少的膜结合酶,称为甲酸氢裂解酶-2(FHL-2),它与线粒体NADH脱氢酶(复合物I)有着迷人的进化联系。在这项工作中,采用分子遗传学和生物化学方法来确定FHL-2在P中具有完全功能。atrosepticum是该细菌产生的分子氢气的主要来源。FHL-2复合物被证明包含活性[NiFe]-氢化酶-4(Hyd-4)同工酶的罕见例子,其本身与最终复合物中不寻常的无硒甲酸脱氢酶连接。此外,对编码预测的FHL-2膜臂的基因的进一步遗传解剖令人惊讶地确定,编码该结构域的大多数基因不是生理产氢活性所需的。总的来说,本研究提出了P。atrosepticums是一种新的模式细菌系统,用于了解厌氧甲酸和氢代谢,特别是FHL-2的功能和结构。
Pectobacterium atrosepticumSCRI1043 is a phytopathogenic Gram‐negative enterobacterium. Genomic analysis has identified that genes required for both respiration and fermentation are expressed under anaerobic conditions. One set of anaerobically expressed genes is predicted to encode an important but poorly understood membrane‐bound enzyme termed formate hydrogenlyase‐2 (FHL‐2), which has fascinating evolutionary links to the mitochondrial NADH dehydrogenase (Complex I). In this work, molecular genetic and biochemical approaches were taken to establish that FHL‐2 is fully functional inP. atrosepticumand is the major source of molecular hydrogen gas generated by this bacterium. The FHL‐2 complex was shown to comprise a rare example of an active [NiFe]‐hydrogenase‐4 (Hyd‐4) isoenzyme, itself linked to an unusual selenium‐free formate dehydrogenase in the final complex. In addition, further genetic dissection of the genes encoding the predicted membrane arm of FHL‐2 established surprisingly that the majority of genes encoding this domain are not required for physiological hydrogen production activity. Overall, this study presentsP. atrosepticumas a new model bacterial system for understanding anaerobic formate and hydrogen metabolism in general, and FHL‐2 function and structure in particular.
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