Readiness to withstand oxidative stress
It has been shown previously that Geobacter species can be oxidatively stressed in batch incubations with insoluble oxides of Fe(III) and Mn(IV) [1], in chemostats with soluble Fe(III) citrate , and in natural sediments containing Fe(III) oxides . The current study also revealed an oxidative stress response of G. metallireducens in retentostats with soluble Fe(III) citrate. The proteomic data suggested that, at low growth rates, G. metallireducens was prepared for exposure to superoxide radicals (e.g. increased abundances of cytochrome c (Gmet 0115) and cytochrome bd (Gmet 1930), as well as ferredoxin (Gmet 0148)) , and hydrogen peroxide (increase in abundance of cytochrome c catalase
(Gmet 1094) ).