硫化地杆菌
菌毛
电子转移
地杆菌
电子受体
化学
电子传输链
纳米线
细胞外
材料科学
纳米技术
生物物理学
生物膜
细菌
生物
生物化学
光化学
基因
毒力
遗传学
作者
Gemma Reguera,Kevin McCarthy,Teena Mehta,Julie S. Nicoll,Mark Tuominen,Derek R. Lovley
出处
期刊:Nature
[Springer Nature]
日期:2005-06-01
卷期号:435 (7045): 1098-1101
被引量:2373
摘要
Microbes that can transfer electrons to extracellular electron acceptors, such as Fe(iii) oxides, are important in organic matter degradation and nutrient cycling in soils and sediments. Previous investigations on electron transfer to Fe(iii) have focused on the role of outer-membrane c-type cytochromes. However, some Fe(iii) reducers lack c-cytochromes. Geobacter species, which are the predominant Fe(iii) reducers in many environments, must directly contact Fe(iii) oxides to reduce them, and produce monolateral pili that were proposed, on the basis of the role of pili in other organisms, to aid in establishing contact with the Fe(iii) oxides. Here we report that a pilus-deficient mutant of Geobacter sulfurreducens could not reduce Fe(iii) oxides but could attach to them. Conducting-probe atomic force microscopy revealed that the pili were highly conductive. These results indicate that the pili of G. sulfurreducens might serve as biological nanowires, transferring electrons from the cell surface to the surface of Fe(iii) oxides. Electron transfer through pili indicates possibilities for other unique cell-surface and cell-cell interactions, and for bioengineering of novel conductive materials.
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