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Sulfate-reducing bacteria (SRB) are anaerobic, mainly responsible for microbial-induced corrosion through extracellular electron transport either by direct electron transfer via protein filament (nanowire) or indirect electron transfer mediated by a redox-active mediator. Nanowires are produced in response to stress by electron acceptor or donor deficiency and can transfer electrons at a higher rate over long distances like metal to satisfy the bacterial need for survival. Few studies have reported nanowires in SRB, and the mechanism, potential genes involved, and their regulation is largely missing. Desulfovibrio desulfuricans, Desulfovibrio ferrophilus, and D. ferrophilus IS5 during starvation of lactate (electron donor) and presence of insoluble Fe (III) oxide (electron acceptor) have shown the formation of nanowires. For instance, nanowires produced by SRB measured at 7-9 nm, 8-12 nm, and 6µm (height, width, and …