Long-distance electron transfer in a filamentous Gram-positive bacterium

Author:

Yang Yonggang,Wang Zegao,Gan Cuifen,Klausen Lasse HyldgaardORCID,Bonné RobinORCID,Kong Guannan,Luo Dizhou,Meert Mathijs,Zhu Chunjie,Sun Guoping,Guo Jun,Ma Yuxin,Bjerg Jesper Tataru,Manca JeanORCID,Xu MeiyingORCID,Nielsen Lars PeterORCID,Dong MingdongORCID

Abstract

AbstractLong-distance extracellular electron transfer has been observed in Gram-negative bacteria and plays roles in both natural and engineering processes. The electron transfer can be mediated by conductive protein appendages (in short unicellular bacteria such as Geobacter species) or by conductive cell envelopes (in filamentous multicellular cable bacteria). Here we show that Lysinibacillus varians GY32, a filamentous unicellular Gram-positive bacterium, is capable of bidirectional extracellular electron transfer. In microbial fuel cells, L. varians can form centimetre-range conductive cellular networks and, when grown on graphite electrodes, the cells can reach a remarkable length of 1.08 mm. Atomic force microscopy and microelectrode analyses suggest that the conductivity is linked to pili-like protein appendages. Our results show that long-distance electron transfer is not limited to Gram-negative bacteria.

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry

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