A trans-outer membrane porin-cytochrome protein complex for extracellular electron transfer by Geobacter sulfurreducens PCA

Summary The multi‐heme, outer membrane c‐type cytochrome (c‐Cyt) OmcB of Geobacter sulfurreducens was previously proposed to mediate electron transfer across the outer membrane. However, the underlying mechanism has remained uncharacterized. In G. sulfurreducens, the omcB gene is part of two tandem...

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Published inEnvironmental microbiology reports Vol. 6; no. 6; pp. 776 - 785
Main Authors Liu, Yimo, Wang, Zheming, Liu, Juan, Levar, Caleb, Edwards, Marcus J., Babauta, Jerome T., Kennedy, David W., Shi, Zhi, Beyenal, Haluk, Bond, Daniel R., Clarke, Thomas A., Butt, Julea N., Richardson, David J., Rosso, Kevin M., Zachara, John M, Fredrickson, James K., Shi, Liang
Format Journal Article
LanguageEnglish
Published United States Blackwell Publishing Ltd 01.12.2014
John Wiley & Sons, Inc
Wiley-Blackwell
BlackWell Publishing Ltd
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Abstract Summary The multi‐heme, outer membrane c‐type cytochrome (c‐Cyt) OmcB of Geobacter sulfurreducens was previously proposed to mediate electron transfer across the outer membrane. However, the underlying mechanism has remained uncharacterized. In G. sulfurreducens, the omcB gene is part of two tandem four‐gene clusters, each is predicted to encode a transcriptional factor (OrfR/OrfS), a porin‐like outer membrane protein (OmbB/OmbC), a periplasmic c‐type cytochrome (OmaB/OmaC) and an outer membrane c‐Cyt (OmcB/OmcC) respectively. Here, we showed that OmbB/OmbC, OmaB/OmaC and OmcB/OmcC of G. sulfurreducens PCA formed the porin‐cytochrome (Pcc) protein complexes, which were involved in transferring electrons across the outer membrane. The isolated Pcc protein complexes reconstituted in proteoliposomes transferred electrons from reduced methyl viologen across the lipid bilayer of liposomes to Fe(III)‐citrate and ferrihydrite. The pcc clusters were found in all eight sequenced Geobacter and 11 other bacterial genomes from six different phyla, demonstrating a widespread distribution of Pcc protein complexes in phylogenetically diverse bacteria. Deletion of ombB‐omaB‐omcB‐orfS‐ombC‐omaC‐omcC gene clusters had no impact on the growth of G. sulfurreducens PCA with fumarate but diminished the ability of G. sulfurreducens PCA to reduce Fe(III)‐citrate and ferrihydrite. Complementation with the ombB‐omaB‐omcB gene cluster restored the ability of G. sulfurreducens PCA to reduce Fe(III)‐citrate and ferrihydrite.
AbstractList The multi-heme, outer membrane c -type cytochrome ( c -Cyt) OmcB of G eobacter sulfurreducens was previously proposed to mediate electron transfer across the outer membrane. However, the underlying mechanism has remained uncharacterized. In G . sulfurreducens , the omcB gene is part of two tandem four-gene clusters, each is predicted to encode a transcriptional factor (OrfR/OrfS), a porin-like outer membrane protein (OmbB/OmbC), a periplasmic c- type cytochrome (OmaB/OmaC) and an outer membrane c -Cyt (OmcB/OmcC) respectively. Here, we showed that OmbB/OmbC, OmaB/OmaC and OmcB/OmcC of G . sulfurreducens  PCA formed the porin-cytochrome (Pcc) protein complexes, which were involved in transferring electrons across the outer membrane. The isolated Pcc protein complexes reconstituted in proteoliposomes transferred electrons from reduced methyl viologen across the lipid bilayer of liposomes to Fe(III)-citrate and ferrihydrite. The pcc clusters were found in all eight sequenced G eobacter and 11 other bacterial genomes from six different phyla, demonstrating a widespread distribution of Pcc protein complexes in phylogenetically diverse bacteria. Deletion of ombB-omaB-omcB-orfS-ombC-omaC-omcC gene clusters had no impact on the growth of G . sulfurreducens  PCA with fumarate but diminished the ability of G . sulfurreducens  PCA to reduce Fe(III)-citrate and ferrihydrite. Complementation with the ombB-omaB-omcB gene cluster restored the ability of G . sulfurreducens  PCA to reduce Fe(III)-citrate and ferrihydrite.
The multi-heme, outer membrane c-type cytochrome (c-Cyt) OmcB of Geobacter sulfurreducens was previously proposed to mediate electron transfer across the outer membrane. However, the underlying mechanism has remained uncharacterized. In G. sulfurreducens, the omcB gene is part of two tandem four-gene clusters, each is predicted to encode a transcriptional factor (OrfR/OrfS), a porin-like outer membrane protein (OmbB/OmbC), a periplasmic c-type cytochrome (OmaB/OmaC) and an outer membrane c-Cyt (OmcB/OmcC) respectively. Here, we showed that OmbB/OmbC, OmaB/OmaC and OmcB/OmcC of G. sulfurreducens PCA formed the porin-cytochrome (Pcc) protein complexes, which were involved in transferring electrons across the outer membrane. The isolated Pcc protein complexes reconstituted in proteoliposomes transferred electrons from reduced methyl viologen across the lipid bilayer of liposomes to Fe(III)-citrate and ferrihydrite. The pcc clusters were found in all eight sequenced Geobacter and 11 other bacterial genomes from six different phyla, demonstrating a widespread distribution of Pcc protein complexes in phylogenetically diverse bacteria. Deletion of ombB-omaB-omcB-orfS-ombC-omaC-omcC gene clusters had no impact on the growth of G. sulfurreducens PCA with fumarate but diminished the ability of G. sulfurreducens PCA to reduce Fe(III)-citrate and ferrihydrite. Complementation with the ombB-omaB-omcB gene cluster restored the ability of G. sulfurreducens PCA to reduce Fe(III)-citrate and ferrihydrite.
Summary The multi‐heme, outer membrane c‐type cytochrome (c‐Cyt) OmcB of Geobacter sulfurreducens was previously proposed to mediate electron transfer across the outer membrane. However, the underlying mechanism has remained uncharacterized. In G. sulfurreducens, the omcB gene is part of two tandem four‐gene clusters, each is predicted to encode a transcriptional factor (OrfR/OrfS), a porin‐like outer membrane protein (OmbB/OmbC), a periplasmic c‐type cytochrome (OmaB/OmaC) and an outer membrane c‐Cyt (OmcB/OmcC) respectively. Here, we showed that OmbB/OmbC, OmaB/OmaC and OmcB/OmcC of G. sulfurreducens PCA formed the porin‐cytochrome (Pcc) protein complexes, which were involved in transferring electrons across the outer membrane. The isolated Pcc protein complexes reconstituted in proteoliposomes transferred electrons from reduced methyl viologen across the lipid bilayer of liposomes to Fe(III)‐citrate and ferrihydrite. The pcc clusters were found in all eight sequenced Geobacter and 11 other bacterial genomes from six different phyla, demonstrating a widespread distribution of Pcc protein complexes in phylogenetically diverse bacteria. Deletion of ombB‐omaB‐omcB‐orfS‐ombC‐omaC‐omcC gene clusters had no impact on the growth of G. sulfurreducens PCA with fumarate but diminished the ability of G. sulfurreducens PCA to reduce Fe(III)‐citrate and ferrihydrite. Complementation with the ombB‐omaB‐omcB gene cluster restored the ability of G. sulfurreducens PCA to reduce Fe(III)‐citrate and ferrihydrite.
The multiheme, outer membrane c-type cytochrome (c-Cyt) OmcB of Geobacter sulfurreducens was previously proposed to mediate electron transfer across the outer membrane. However, the underlying mechanism has remained uncharacterized. In G. sulfurreducens, the omcB gene is part of two tandem four-gene clusters, each is predicted to encode a transcriptional factor (OrfR/OrfS), a porin-like outer membrane protein (OmbB/OmbC), a periplasmic c-type cytochrome (OmaB/OmaC), and an outer membrane c-Cyt (OmcB/OmcC), respectively. Here we showed that OmbB/OmbC, OmaB/OmaC and OmcB/OmcC of G. sulfurreducens PCA formed the porin-cytochrome (Pcc) protein complexes, which were involved in transferring electrons across the outer membrane. The isolated Pcc protein complexes reconstituted in proteoliposomes transferred electrons from reduced methyl viologen across the lipid bilayer of liposomes to Fe(III)-citrate and ferrihydrite. The pcc clusters were found in all eight sequenced Geobacter and 11 other bacterial genomes from six different phyla, demonstrating a widespread distribution of Pcc protein complexes in phylogenetically diverse bacteria. Deletion of ombB-omaB-omcB-orfS-ombC-omaC-omcC gene clusters had no impact on the growth of G. sulfurreducens PCA with fumarate, but diminished the ability of G. sulfurreducens PCA to reduce Fe(III)-citrate and ferrihydrite. Finally, complementation with the ombB-omaB-omcB gene cluster restored the ability of G. sulfurreducens PCA to reduce Fe(III)-citrate and ferrihydrite.
Author Shi, Zhi
Bond, Daniel R.
Liu, Juan
Edwards, Marcus J.
Wang, Zheming
Kennedy, David W.
Richardson, David J.
Babauta, Jerome T.
Clarke, Thomas A.
Zachara, John M
Rosso, Kevin M.
Shi, Liang
Beyenal, Haluk
Fredrickson, James K.
Liu, Yimo
Levar, Caleb
Butt, Julea N.
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2014 The Authors. Environmental Microbiology Reports published by Society for Applied Microbiology and John Wiley & Sons Ltd. 2014
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Fig. S1. The amino acid sequence of OmbB/OmbC. The N-terminus and predicted short solvent-exposed loops are in green, the predicted trans-outer membrane motifs are in red, and predicted long solvent-exposed loops are in blue. The 20 trans-outer membrane motifs are numbered sequentially, and the numbers are displayed in black and above the polypeptide sequence. Fig. S2. Mass spectrometry confirmation of OmbB/OmbC proteins. OmbB/OmbC amino acid sequence with peptides identified by tryptic digest MALDI mass spectrometry are highlighted in red (sequence coverage 22%). Observed peaks and corresponding peptides of OmbB/OmbC are detailed in Table S1. Fig. S3. Verification of gene cluster replacement mutants and related complement strain by heme staining after SDS-PAGE. A. The gene cluster replacement mutants. Lane 1, ΔombB-omaB-omcB; lane 2, ΔombC-omaC-omcC; lane 3, ΔombB-omaB-omcB-orfS-ombC-omaC-omcC. B. Complement strain of ΔombB-omaB-omcB-orfS-ombC-omaC-omcC with ombB-omaB-omcB. G. sulfurreducens PCA cells were used as a positive control. OmaB/OmaC and OmcB/OmcC are indicated. About 104 CFU were loaded in each lane. Fig. S4. Characterization of OmaB/OmaC- or OmcB/OmcC-specific antibodies. A. OmaB/OmaC-specific antibodies. B. OmcB/OmcC-specific antibodies. Migration positions of the proteins standards (kDa) are indicated. Affinity purified OmaBC-specific antibodies were used at 1: 10 000 dilutions; while affinity purified OmcBC-specific antibodies were used at 1: 20 000 dilutions. About 104 CFU were loaded in each lane. Lane 1, G. sulfurreducens PCA; lane 2, ΔombB-omaB-omcB-orfS-ombC-omaC-omcC. Table S1. Identified peptide sequences of OmbB/OmbC by mass spectrometry. Table S2. Identified bacterial Pcc homologuesa. Table S3. Bacterial strains, plasmids, primers and polypeptides used in this study.
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SSID ssj0064902
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Snippet Summary The multi‐heme, outer membrane c‐type cytochrome (c‐Cyt) OmcB of Geobacter sulfurreducens was previously proposed to mediate electron transfer across...
The multi-heme, outer membrane c-type cytochrome (c-Cyt) OmcB of Geobacter sulfurreducens was previously proposed to mediate electron transfer across the outer...
The multi‐heme, outer membrane c‐type cytochrome (c‐Cyt) OmcB of Geobacter sulfurreducens was previously proposed to mediate electron transfer across the outer...
The multiheme, outer membrane c-type cytochrome (c-Cyt) OmcB of Geobacter sulfurreducens was previously proposed to mediate electron transfer across the outer...
The multi-heme, outer membrane c -type cytochrome ( c -Cyt) OmcB of G eobacter sulfurreducens was previously proposed to mediate electron transfer across the...
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SubjectTerms Amino acids
Bacteria
Bacterial Outer Membrane Proteins - genetics
Bacterial Outer Membrane Proteins - metabolism
Bacterial Proteins - genetics
Bacterial Proteins - metabolism
BASIC BIOLOGICAL SCIENCES
Brief Reports
Citric acid
Complementation
Cytochrome
Cytochromes
Cytochromes c - genetics
Cytochromes c - metabolism
Electron transfer
Electron Transport
Electrons
element cycles and biogeochemical processes
Gene clusters
Gene deletion
Genomes
Geobacter - genetics
Geobacter - metabolism
Geobacter sulfurreducens
Gram-negative bacteria
Hypotheses
Iron
Lipid bilayers
Lipids
Membranes
metals
Methyl viologen
Multigene Family
Nanowires
OmcB gene
Oxidation
Oxidation-Reduction
Phylogeny
Porins - genetics
Porins - metabolism
Protein Binding
Proteins
Title A trans-outer membrane porin-cytochrome protein complex for extracellular electron transfer by Geobacter sulfurreducens PCA
URI https://api.istex.fr/ark:/67375/WNG-9S0X4VLH-9/fulltext.pdf
https://onlinelibrary.wiley.com/doi/abs/10.1111%2F1758-2229.12204
https://www.ncbi.nlm.nih.gov/pubmed/25139405
https://www.proquest.com/docview/3092268484
https://search.proquest.com/docview/1628881733
https://www.osti.gov/servlets/purl/1167625
https://pubmed.ncbi.nlm.nih.gov/PMC4282303
Volume 6
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