@article {495,
	title = {Steady state protein levels in Geobacter metallireducens grown with iron (III) citrate or nitrate as terminal electron acceptor.},
	journal = {Proteomics},
	volume = {7},
	year = {2007},
	month = {2007 Nov},
	pages = {4148-57},
	abstract = {Geobacter species predominate in aquatic sediments and submerged soils where organic carbon sources are oxidized with the reduction of Fe(III). The natural occurrence of Geobacter in some waste sites suggests this microorganism could be useful for bioremediation if growth and metabolic activity can be regulated. 2-DE was used to monitor the steady state protein levels of Geobacter metallireducens grown with either Fe(III) citrate or nitrate to elucidate metabolic differences in response to different terminal electron acceptors present in natural environments populated by Geobacter. Forty-six protein spots varied significantly in abundance (p<0.05) between the two growth conditions; proteins were identified by tryptic peptide mass and peptide sequence determined by MS/MS. Enzymes involved in pyruvate metabolism and the tricarboxylic acid (TCA) cycle were more abundant in cells grown with Fe(III) citrate, while proteins associated with nitrate metabolism and sensing cellular redox status along with several proteins of unknown function were more abundant in cells grown with nitrate. These results indicate a higher level of flux through the TCA cycle in the presence of Fe(III) compared to nitrate. The oxidative stress response observed in previous studies of Geobacter sulfurreducens grown with Fe(III) citrate was not seen in G. metallireducens.},
	keywords = {Bacterial Proteins, Cell Proliferation, Electrons, Electrophoresis, Gel, Two-Dimensional, Ferric Compounds, Geobacter, Hydrogen-Ion Concentration, Nitrates, Oxidation-Reduction, Proteomics, Tandem Mass Spectrometry},
	issn = {1615-9853},
	doi = {10.1002/pmic.200600955},
	author = {Ahrendt, Angela J and Tollaksen, Sandra L and Lindberg, Carl and Zhu, Wenhong and Yates, John R and Nevin, Kelly P and Babnigg, Gy{\"o}rgy and Lovley, Derek R and Giometti, Carol S}
}
@article {702,
	title = {Differential protein expression in the metal-reducing bacterium Geobacter sulfurreducens strain PCA grown with fumarate or ferric citrate.},
	journal = {Proteomics},
	volume = {6},
	year = {2006},
	month = {2006 Jan},
	pages = {632-40},
	abstract = {Geobacter sulfurreducens, generally considered to be a strict anaerobe, is a predominant microbe in subsurface environments, where it utilizes available metals as electron acceptors. To better understand the metabolic processes involved in the metal-reduction capability of this microbe, the proteins expressed by cells grown anaerobically with either fumarate or ferric citrate as electron acceptor were compared. Proteins were separated by 2-DE under denaturing or nondenaturing conditions, and proteins varying in abundance with a high level of statistical significance (p<0.0001) were identified by peptide mass analysis. Denaturing 2-DE revealed significant differences in the relative abundance of the membrane proteins OmpA and peptidoglycan-associated lipoprotein, several metabolic enzymes, and, in addition, superoxide dismutase and rubredoxin oxidoreductase. Nondenaturing 2-DE revealed elevated catalase in cells grown with ferric citrate. These results suggest that, in addition to adjustments in membrane transport and specific metabolic pathways in response to these two different electron acceptors, distinct differences exist in the oxidative environment within the cell when fumarate or soluble ferric citrate is provided as electron acceptor. Although an anaerobe, G. sulfurreducens appears to have alternate mechanisms for dealing with reactive oxygen species in response to increased intracellular soluble iron.},
	keywords = {Anaerobiosis, Bacterial Proteins, Electrophoresis, Gel, Two-Dimensional, Ferric Compounds, Fumarates, Geobacter, Oxidation-Reduction, Proteomics, Reactive Oxygen Species, Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization},
	issn = {1615-9853},
	doi = {10.1002/pmic.200500137},
	author = {Khare, Tripti and Esteve-N{\'u}{\~n}ez, Abraham and Nevin, Kelly P and Zhu, Wenhong and Yates, John R and Lovley, Derek and Giometti, Carol S}
}
