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Title: Redox linked flavin sites in extracellular decaheme proteins involved in microbe-mineral electron transfer.

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep11677· OSTI ID:1203147

Extracellular microbe-mineral electron transfer is a major driving force for the oxidation of organic carbon in many subsurface environments. Extracellular multi-heme cytochromes of the Shewenella genus play a major role in this process but the mechanism of electron exchange at the interface between cytochrome and acceptor is widely debated. The 1.8 Å x-ray crystal structure of the decaheme MtrC revealed a highly conserved CX₈C disulfide that, when substituted for AX₈A, severely compromised the ability of S. oneidensis to grow under aerobic conditions. Reductive cleavage of the disulfide in the presence of flavin mononucleotide (FMN) resulted in the reversible formation of a stable flavocytochrome. Similar results were also observed with other decaheme cytochromes, OmcA, MtrF and UndA. The data suggest that these decaheme cytochromes can transition between highly reactive flavocytochromes or less reactive cytochromes, and that this transition is controlled by a redox active disulfide that responds to the presence of oxygen.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1203147
Journal Information:
Scientific Reports, Vol. 5; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 118 works
Citation information provided by
Web of Science

References (42)

The X-ray crystal structure of Shewanella oneidensis OmcA reveals new insight at the microbe-mineral interface journal April 2014
Protein Oxidation Implicated as the Primary Determinant of Bacterial Radioresistance journal March 2007
Rapid electron exchange between surface-exposed bacterial cytochromes and Fe(III) minerals journal March 2013
Electron Transport at the Microbe–Mineral Interface: a synthesis of current research challenges journal November 2012
Bacterial respiration: a flexible process for a changing environment journal March 2000
Extracellular Reduction of Hexavalent Chromium by Cytochromes MtrC and OmcA of Shewanella oneidensis MR-1 journal April 2011
Kinetic Characterization of OmcA and MtrC, Terminal Reductases Involved in Respiratory Electron Transfer for Dissimilatory Iron Reduction in Shewanella oneidensis MR-1 journal June 2009
Structure of a bacterial cell surface decaheme electron conduit journal May 2011
Exploring the molecular mechanisms of electron shuttling across the microbe/metal space journal June 2014
Shewanella oneidensis MR-1 nanowires are outer membrane and periplasmic extensions of the extracellular electron transport components journal August 2014
Role of outer-membrane cytochromes MtrC and OmcA in the biomineralization of ferrihydrite by Shewanella oneidensis MR-1: MtrC and OmcA in biomineralization journal January 2010
Interactive Tree Of Life (iTOL): an online tool for phylogenetic tree display and annotation journal October 2006
Accumulation of Mn(II) in Deinococcus radiodurans Facilitates Gamma-Radiation Resistance journal November 2004
Analysis of structural MtrC models based on homology with the crystal structure of MtrF journal November 2012
Structure of trypanothione reductase from Crithidia fasciculata at 2.6 Å resolution; enzyme–NADP interactions at 2.8 Å resolution journal March 1994
The Crystal Structure of the Extracellular 11-heme Cytochrome UndA Reveals a Conserved 10-heme Motif and Defined Binding Site for Soluble Iron Chelates journal July 2012
Exploring the biochemistry at the extracellular redox frontier of bacterial mineral Fe(III) respiration journal May 2012
BLAST: a more efficient report with usability improvements journal April 2013
Breaking good resolutions with ARP/wARP journal November 2003
Shewanella secretes flavins that mediate extracellular electron transfer journal March 2008
Isolation of a High-Affinity Functional Protein Complex between OmcA and MtrC: Two Outer Membrane Decaheme c-Type Cytochromes of Shewanella oneidensis MR-1 journal June 2006
Towards environmental systems biology of Shewanella journal July 2008
Direct Involvement of Type II Secretion System in Extracellular Translocation of Shewanella oneidensis Outer Membrane Cytochromes MtrC and OmcA journal May 2008
REFMAC 5 for the refinement of macromolecular crystal structures journal March 2011
Shuttling happens: soluble flavin mediators of extracellular electron transfer in Shewanella journal November 2011
Rate enhancement of bacterial extracellular electron transport involves bound flavin semiquinones journal April 2013
PHENIX: a comprehensive Python-based system for macromolecular structure solution journal January 2010
Characterization of an electron conduit between bacteria and the extracellular environment journal December 2009
Fast, scalable generation of high‐quality protein multiple sequence alignments using Clustal Omega journal January 2011
Electrical transport along bacterial nanowires from Shewanella oneidensis MR-1 journal October 2010
Integration of macromolecular diffraction data journal October 1999
Jalview Version 2--a multiple sequence alignment editor and analysis workbench journal January 2009
Role of outer membrane c-type cytochromes MtrC and OmcA in Shewanella oneidensis MR-1 cell production, accumulation, and detachment during respiration on hematite: Growth of S. oneidensis MR-1 on hematite journal February 2012
Flavin Electron Shuttles Dominate Extracellular Electron Transfer by Shewanella oneidensis journal January 2013
The Mtr Respiratory Pathway Is Essential for Reducing Flavins and Electrodes in Shewanella oneidensis journal November 2009
Shewanella putrefaciens mtrB Encodes an Outer Membrane Protein Required for Fe(III) and Mn(IV) Reduction journal December 1998
Cavin1 intrinsically disordered domains are essential for fuzzy electrostatic interactions and caveola formation journal February 2021
Why does the Aβ peptide of Alzheimer share structural similarity with antimicrobial peptides? journal March 2020
Integration of macromolecular diffraction data book April 2012
Integration of macromolecular diffraction data book October 2006
PHENIX: a comprehensive Python-based system for macromolecular structure solution. text January 2010
Enzyme or Electrode? journal July 2012

Cited By (29)

Distinct Electron Conductance Regimes in Bacterial Decaheme Cytochromes journal May 2018
Proton Transport in the Outer-Membrane Flavocytochrome Complex Limits the Rate of Extracellular Electron Transport journal June 2017
Biogenic Iron Sulfide Nanoparticles to Enable Extracellular Electron Uptake in Sulfate‐Reducing Bacteria journal January 2020
Photosensitised Multiheme Cytochromes as Light-Driven Molecular Wires and Resistors journal September 2018
Role of multiheme cytochromes involved in extracellular anaerobic respiration in bacteria journal November 2019
Microbial Electron Transport in the Deep Subsurface book January 2017
The role of riboflavin in decolourisation of Congo red and bioelectricity production using Shewanella oneidensis-MR1 under MFC and non-MFC conditions journal February 2017
Extracellular electron transfer mechanisms between microorganisms and minerals journal August 2016
Electron transfer pathways in a multiheme cytochrome MtrF journal March 2017
Ultrastructure of Shewanella oneidensis MR-1 nanowires revealed by electron cryotomography journal March 2018
Kinetics of trifurcated electron flow in the decaheme bacterial proteins MtrC and MtrF journal February 2019
Bucking the current trend in bioelectrochemical systems: a case for bioelectroanalytics journal September 2017
Geobacter cytochrome OmcZs binds riboflavin: implications for extracellular electron transfer journal January 2020
NanoSIMS imaging of extracellular electron transport processes during microbial iron(III) reduction journal June 2018
Extracellular Electron Transfer by Shewanella oneidensis Controls Pd Nanoparticle Phenotype journal May 2018
Electromicrobiology: realities, grand challenges, goals and predictions journal August 2016
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Secreted Flavin Cofactors for Anaerobic Respiration of Fumarate and Urocanate by Shewanella oneidensis : Cost and Role journal June 2019
In Situ Analysis of a Silver Nanoparticle-Precipitating Shewanella Biofilm by Surface Enhanced Confocal Raman Microscopy journal December 2015
Overview on the Bacterial Iron-Riboflavin Metabolic Axis journal July 2018
Proton Transport in the Outer‐Membrane Flavocytochrome Complex Limits the Rate of Extracellular Electron Transport journal June 2017
Biogenic Iron Sulfide Nanoparticles to Enable Extracellular Electron Uptake in Sulfate‐Reducing Bacteria journal January 2020
Distinct Electron Conductance Regimes in Bacterial Decaheme Cytochromes journal May 2018
Electron Transfer Pathways in a Multiheme Cytochrome MtrF [マルチへムシトクロム蛋白質MtrFの電子移動経路] journal January 2017
Extracellular reduction of solid electron acceptors by Shewanella oneidensis text January 2018
Extracellular reduction of solid electron acceptors by Shewanella oneidensis text January 2018
Correction: In Situ Analysis of a Silver Nanoparticle-Precipitating Shewanella Biofilm by Surface Enhanced Confocal Raman Microscopy journal June 2018
Chemical Characteristics of Electron Shuttles Affect Extracellular Electron Transfer: Shewanella decolorationis NTOU1 Simultaneously Exploiting Acetate and Mediators journal March 2019
Thermophiles; or, the Modern Prometheus: The Importance of Extreme Microorganisms for Understanding and Applying Extracellular Electron Transfer journal April 2019