Extracellular electron transfer from cathode to microbes: application for biofuel production

Table 2 Predicted electron transfer proteins associated in extracellular electron transfer

Predicted electron transfer proteins	Active sites	Candidate microorganism associated in extracellular electron transfer	Microorganism used in bioelectrochemical system
Cytochrome C	Heme protein	Metal-reducing bacteria (Geobacter, Shewanella)	G. sulfurreducens [19, 48], Shewanella oneidensis [18]
Ferredoxin	Fe-S protein	Clostridia, acetogens, methanogens	Clostridium pasteurianum [24], Clostridium ljungdahlii, Clostridium aceticum, Moorella thermoacetica [106], Sporomusa ovata [106, 107], Methanothermobacter thermautotrophicus [108], Methanobacterium palustre, Methanococcus maripaludis [53, 54]
Rubredoxin	Fe-S protein without acid–labile sulfur	Sulfate-reducing bacteria	Desulfovibrio sp. [22, 70]
Hydrogenase	[NiFe] or [FeFe] or [Fe]-only	Sulfate-reducing bacteria, methanogen	Desulfovibrio sp. [22, 70], methanogens [52, 53]
Formate dehydrogenase	Molybdenum or tungsten	Sulfate-reducing bacteria	Desulfovibrio sp. [22, 70]

ISSN: 2731-3654