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Title: Fine Tuning of Redox Networks on Multiheme Cytochromes from Geobacter sulfurreducens Drives Physiological Electron/Proton Energy Transduction

Journal Article · · Bioinorganic Chemistry and Applications
DOI:https://doi.org/10.1155/2012/298739· OSTI ID:1626203
 [1];  [1];  [2];  [3];  [1]
  1. Universidade Nova de Lisboa, Campus Caparica, Caparica (Portugal). Faculdade de Ciências e Tecnologia. Departamento de Química. Requimte-CQFB
  2. Instituto de Química-Física “Rocasolano”, Madrid (Spain). CSIC. Departamento de Espectroscopía y Estructura Molecular
  3. Argonne National Lab. (ANL), Argonne, IL (United States)

The bacteriumGeobacter sulfurreducens (Gs)can grow in the presence of extracellular terminal acceptors, a property that is currently explored to harvest electricity from aquatic sediments and waste organic matter into microbial fuel cells. A family composed of five triheme cytochromes (PpcA-E) was identified inGs. These cytochromes play a crucial role by bridging the electron transfer from oxidation of cytoplasmic donors to the cell exterior and assisting the reduction of extracellular terminal acceptors. The detailed thermodynamic characterization of such proteins showed that PpcA and PpcD have an important redox-Bohr effect that might implicate these proteins in the e-/H+coupling mechanisms to sustain cellular growth. The physiological relevance of the redox-Bohr effect in these proteins was studied by determining the fractional contribution of each individual redox-microstate at different pH values. For both proteins, oxidation progresses from a particular protonated microstate to a particular deprotonated one, over specific pH ranges. The preferred e-/H+transfer pathway established by the selected microstates indicates that both proteins are functionally designed to couple e-/H+transfer at the physiological pH range for cellular growth.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1626203
Journal Information:
Bioinorganic Chemistry and Applications, Vol. 2012; ISSN 1565-3633
Publisher:
HindawiCopyright Statement
Country of Publication:
United States
Language:
English

References (26)

The proteome of dissimilatory metal-reducing microorganism Geobacter sulfurreducens under various growth conditions journal July 2006
OmcF, a Putative c-Type Monoheme Outer Membrane Cytochrome Required for the Expression of Other Outer Membrane Cytochromes in Geobacter sulfurreducens journal June 2005
Bug juice: harvesting electricity with microorganisms journal July 2006
Proton thrusters: overview of the structural and functional features of soluble tetrahaem cytochromes c 3 journal September 2006
Carbonate Species as OH Carriers for Decreasing the pH Gradient between Cathode and Anode in Biological Fuel Cells journal December 2008
Optimization of culture conditions and electricity generation using Geobacter sulfurreducens in a dual-chambered microbial fuel-cell journal December 2010
pH, redox potential and local biofilm potential microenvironments within Geobacter sulfurreducens biofilms and their roles in electron transfer journal May 2012
Proton transport inside the biofilm limits electrical current generation by anode-respiring bacteria journal August 2008
Microbial Biofilm Voltammetry: Direct Electrochemical Characterization of Catalytic Electrode-Attached Biofilms journal October 2008
Redox-Bohr effect in electron/proton energy transduction: cytochrome c 3 coupled to hydrogenase works as a 'proton thruster' in Desulfovibrio vulgaris journal August 1997
Family of Cytochrome c 7 -Type Proteins from Geobacter sulfurreducens :  Structure of One Cytochrome c 7 at 1.45 Å Resolution , journal February 2004
Characterization of Proton Production and Consumption Associated with Microbial Metabolism journal January 2010
Importance of c-Type cytochromes for U(VI) reduction by Geobacter sulfurreducens journal January 2007
Proteome of Geobacter sulfurreducens grown with Fe(III) oxide or Fe(III) citrate as the electron acceptor journal December 2008
Evidence that OmcB and OmpB of Geobacter sulfurreducens are outer membrane surface proteins journal December 2007
Evolution of electron transfer out of the cell: comparative genomics of six Geobacter genomes journal January 2010
Cyclic voltammetry of biofilms of wild type and mutant Geobacter sulfurreducens on fuel cell anodes indicates possible roles of OmcB, OmcZ, type IV pili, and protons in extracellular electron transfer journal January 2009
Characterization of Metabolism in the Fe(III)-Reducing Organism Geobacter sulfurreducens by Constraint-Based Modeling journal February 2006
Linking Spectral and Electrochemical Analysis to Monitor c-type Cytochrome Redox Status in Living Geobacter sulfurreducens Biofilms journal June 2011
Biochemical characterization of purified OmcS, a c-type cytochrome required for insoluble Fe(III) reduction in Geobacter sulfurreducens journal April 2011
The history and the hypotheses concerning ATP-formation by energised protons journal January 1978
Thermodynamic Characterization of a Triheme Cytochrome Family from Geobacter sulfurreducens Reveals Mechanistic and Functional Diversity journal July 2010
Structural characterization of a family of cytochromes c7 involved in Fe(III) respiration by Geobacter sulfurreducens journal February 2010
Electrochemical characterization ofGeobacter sulfurreducens cells immobilized on graphite paper electrodes journal January 2008
Biochemical and genetic characterization of PpcA, a periplasmic c-type cytochrome in Geobacter sulfurreducens journal January 2003
Purification and Characterization of OmcZ, an Outer-Surface, Octaheme c-Type Cytochrome Essential for Optimal Current Production by Geobacter sulfurreducens journal April 2010

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