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- EMDB-23481: Cryo-EM structure of OmcZ nanowire from Geobacter sulfurreducens -
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Open data
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Basic information
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Title | Cryo-EM structure of OmcZ nanowire from Geobacter sulfurreducens | |||||||||
![]() | map of octaheme cytochrome OmcZ nanowire from G. sulfurreducens | |||||||||
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![]() | nanowires / PROTEIN FIBRIL | |||||||||
Function / homology | IPT/TIG domain / Multiheme cytochrome superfamily / IPT domain / Immunoglobulin E-set / Immunoglobulin-like fold / Cytochrome c![]() | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | helical reconstruction / cryo EM / Resolution: 3.4 Å | |||||||||
![]() | Gu Y / Srikanth V / Malvankar NS / Samatey FA | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structure of Geobacter cytochrome OmcZ identifies mechanism of nanowire assembly and conductivity. Authors: Yangqi Gu / Matthew J Guberman-Pfeffer / Vishok Srikanth / Cong Shen / Fabian Giska / Kallol Gupta / Yuri Londer / Fadel A Samatey / Victor S Batista / Nikhil S Malvankar / ![]() ![]() Abstract: OmcZ nanowires produced by Geobacter species have high electron conductivity (>30 S cm). Of 111 cytochromes present in G. sulfurreducens, OmcZ is the only known nanowire-forming cytochrome ...OmcZ nanowires produced by Geobacter species have high electron conductivity (>30 S cm). Of 111 cytochromes present in G. sulfurreducens, OmcZ is the only known nanowire-forming cytochrome essential for the formation of high-current-density biofilms that require long-distance (>10 µm) extracellular electron transport. However, the mechanisms underlying OmcZ nanowire assembly and high conductivity are unknown. Here we report a 3.5-Å-resolution cryogenic electron microscopy structure for OmcZ nanowires. Our structure reveals linear and closely stacked haems that may account for conductivity. Surface-exposed haems and charge interactions explain how OmcZ nanowires bind to diverse extracellular electron acceptors and how organization of nanowire network re-arranges in different biochemical environments. In vitro studies explain how G. sulfurreducens employ a serine protease to control the assembly of OmcZ monomers into nanowires. We find that both OmcZ and serine protease are widespread in environmentally important bacteria and archaea, thus establishing a prevalence of nanowire biogenesis across diverse species and environments. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 12.3 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 17.3 KB 17.3 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 13.7 KB | Display | ![]() |
Images | ![]() | 94.7 KB | ||
Masks | ![]() | 216 MB | ![]() | |
Others | ![]() ![]() | 171.4 MB 171.4 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 747.1 KB | Display | ![]() |
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Full document | ![]() | 746.6 KB | Display | |
Data in XML | ![]() | 21.1 KB | Display | |
Data in CIF | ![]() | 27.9 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7lq5MC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | map of octaheme cytochrome OmcZ nanowire from G. sulfurreducens | ||||||||||||||||||||
Voxel size | X=Y=Z: 0.828 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Mask #1
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Projections & Slices |
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Density Histograms |
-Half map: half map of octaheme cytochrome OmcZ nanowire from G. sulfurreducens
File | emd_23481_half_map_1.map | ||||||||||||
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Annotation | half map of octaheme cytochrome OmcZ nanowire from G. sulfurreducens | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: half map of octaheme cytochrome OmcZ nanowire from G. sulfurreducens
File | emd_23481_half_map_2.map | ||||||||||||
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Annotation | half map of octaheme cytochrome OmcZ nanowire from G. sulfurreducens | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Polymerized cytochrome OmcZ from Geobacter sulfurreducens
Entire | Name: Polymerized cytochrome OmcZ from Geobacter sulfurreducens |
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Components |
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-Supramolecule #1: Polymerized cytochrome OmcZ from Geobacter sulfurreducens
Supramolecule | Name: Polymerized cytochrome OmcZ from Geobacter sulfurreducens type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: Cytochrome c
Macromolecule | Name: Cytochrome c / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 27.686797 KDa |
Sequence | String: AVPPPPVNQF LGIYDTKFPN LTKADCLECH VSDTVLVQQH HALINTVTPP ASCINTSGTV PPTLATGCHV MVPDGSGGFT FQDFRNCFN CHTQTPHHTS PAAVAKDCKY CHGNFIDNPL DGHYIPTYSA SSVTPMPSGR SVTATDGNVV IVQGCEACHQ A APNAIDPK ...String: AVPPPPVNQF LGIYDTKFPN LTKADCLECH VSDTVLVQQH HALINTVTPP ASCINTSGTV PPTLATGCHV MVPDGSGGFT FQDFRNCFN CHTQTPHHTS PAAVAKDCKY CHGNFIDNPL DGHYIPTYSA SSVTPMPSGR SVTATDGNVV IVQGCEACHQ A APNAIDPK TNTVRPIFSN QDTHHGTGIT DCNLCHNTSS NVPIRQCEVC HGVNSLHNIQ KDSPNAANLG TVKPGLEDLG WG HIGNNWD CQGCHWSWFG N UniProtKB: Cytochrome c |
-Macromolecule #2: HEME C
Macromolecule | Name: HEME C / type: ligand / ID: 2 / Number of copies: 24 / Formula: HEC |
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Molecular weight | Theoretical: 618.503 Da |
Chemical component information | ![]() ChemComp-HEC: |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | helical reconstruction |
Aggregation state | filament |
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Sample preparation
Buffer | pH: 10.5 / Component - Concentration: 15.0 mM / Component - Formula: C2H7NO / Component - Name: Ethanolamine |
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Grid | Model: C-flat-2/1 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Support film - Film thickness: 30 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 20 sec. / Pretreatment - Atmosphere: AIR |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Specialist optics | Energy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV |
Image recording | Film or detector model: GATAN K3 (6k x 4k) / Detector mode: SUPER-RESOLUTION / Digitization - Frames/image: 2-10 / Number grids imaged: 1 / Number real images: 14508 / Average exposure time: 0.2 sec. / Average electron dose: 1.2 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 100.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Details | Initial fitting was done with Chimera and refinement was done in Phenix |
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Refinement | Space: REAL / Protocol: AB INITIO MODEL / Target criteria: Correlation coefficient |
Output model | ![]() PDB-7lq5: |