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Table 2 Predicted electron transfer proteins associated in extracellular electron transfer

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

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]