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- EMDB-10593: Cryo-EM structure of Pf4 bacteriophage coat protein with single-s... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-10593 | |||||||||
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Title | Cryo-EM structure of Pf4 bacteriophage coat protein with single-stranded DNA | |||||||||
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![]() | Bacteriophage / helical / filamentous / VIRUS | |||||||||
Function / homology | Inovirus Coat protein B / Capsid protein G8P / helical viral capsid / host cell membrane / membrane / Capsid protein G8P / Coat protein B of bacteriophage Pf1![]() | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | helical reconstruction / cryo EM / Resolution: 3.2 Å | |||||||||
![]() | Tarafder AK / von Kugelgen A | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Phage liquid crystalline droplets form occlusive sheaths that encapsulate and protect infectious rod-shaped bacteria. Authors: Abul K Tarafder / Andriko von Kügelgen / Adam J Mellul / Ulrike Schulze / Dirk G A L Aarts / Tanmay A M Bharat / ![]() Abstract: The opportunistic pathogen is a major cause of antibiotic-tolerant infections in humans. evades antibiotics in bacterial biofilms by up-regulating expression of a symbiotic filamentous inoviral ...The opportunistic pathogen is a major cause of antibiotic-tolerant infections in humans. evades antibiotics in bacterial biofilms by up-regulating expression of a symbiotic filamentous inoviral prophage, Pf4. We investigated the mechanism of phage-mediated antibiotic tolerance using biochemical reconstitution combined with structural biology and high-resolution cellular imaging. We resolved electron cryomicroscopy atomic structures of Pf4 with and without its linear single-stranded DNA genome, and studied Pf4 assembly into liquid crystalline droplets using optical microscopy and electron cryotomography. By biochemically replicating conditions necessary for antibiotic protection, we found that phage liquid crystalline droplets form phase-separated occlusive compartments around rod-shaped bacteria leading to increased bacterial survival. Encapsulation by these compartments was observed even when inanimate colloidal rods were used to mimic rod-shaped bacteria, suggesting that shape and size complementarity profoundly influences the process. Filamentous inoviruses are pervasive across prokaryotes, and in particular, several Gram-negative bacterial pathogens including , and harbor these prophages. We propose that biophysical occlusion mediated by secreted filamentous molecules such as Pf4 may be a general strategy of bacterial survival in harsh environments. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 227.1 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 17.4 KB 17.4 KB | Display Display | ![]() |
Images | ![]() | 79.1 KB | ||
Filedesc metadata | ![]() | 6.1 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 514.7 KB | Display | ![]() |
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Full document | ![]() | 514.2 KB | Display | |
Data in XML | ![]() | 6.9 KB | Display | |
Data in CIF | ![]() | 8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6tupMC ![]() 6tuqC M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Voxel size | X=Y=Z: 1.38 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Pseudomonas virus Pf1
Entire | Name: ![]() |
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Components |
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-Supramolecule #1: Pseudomonas virus Pf1
Supramolecule | Name: Pseudomonas virus Pf1 / type: virus / ID: 1 / Parent: 0 / Macromolecule list: all / Virus type: VIRION / Virus isolate: STRAIN / Virus enveloped: No / Virus empty: No |
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Host (natural) | Organism: ![]() |
Virus shell | Shell ID: 1 / Name: Coat protein B (CoaB) / Diameter: 62.0 Å |
-Supramolecule #2: Pseudomonas virus Pf1
Supramolecule | Name: Pseudomonas virus Pf1 / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() |
-Supramolecule #3: DNA
Supramolecule | Name: DNA / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2 |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: Coat protein B of bacteriophage Pf1
Macromolecule | Name: Coat protein B of bacteriophage Pf1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 4.612393 KDa |
Sequence | String: GVIDTSAVES AITDGQGDMK AIGGYIVGAL VILAVAGLIY SMLRKA UniProtKB: Coat protein B of bacteriophage Pf1 |
-Macromolecule #2: DNA (5'-D(P*AP*AP*AP*AP*AP*A)-3')
Macromolecule | Name: DNA (5'-D(P*AP*AP*AP*AP*AP*A)-3') / type: dna / ID: 2 / Details: Model of pf4 single-stranded DNA genome / Number of copies: 1 / Classification: DNA |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 1.834283 KDa |
Sequence | String: (DA)(DA)(DA)(DA)(DA)(DA) |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | helical reconstruction |
Aggregation state | filament |
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Sample preparation
Concentration | 5 mg/mL | |||||||||||||||
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Buffer | pH: 7.4 Component:
Details: 1x Phosphate buffered saline | |||||||||||||||
Grid | Model: Quantifoil R2/2 / Material: COPPER/RHODIUM / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 20 sec. / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.03 kPa Details: 20 second glow discharge at 15 mA in a LeicaEM ACE200 | |||||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 283 K / Instrument: FEI VITROBOT MARK IV Details: Samples for cryo-EM were prepared by pipetting 2.5 ul of the sample onto freshly glow-discharged Quantifoil grids (Cu/Rh R2/2, 200 mesh). Grids were blotted for 2.5 seconds with a blot force ...Details: Samples for cryo-EM were prepared by pipetting 2.5 ul of the sample onto freshly glow-discharged Quantifoil grids (Cu/Rh R2/2, 200 mesh). Grids were blotted for 2.5 seconds with a blot force of -15, 0.5 second drain and 0 second wait times.. | |||||||||||||||
Details | Filamentous phage purified from source |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Temperature | Min: 80.0 K / Max: 80.0 K |
Specialist optics | Energy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV |
Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Frames/image: 1-40 / Number grids imaged: 2 / Number real images: 4110 / Average exposure time: 10.0 sec. / Average electron dose: 43.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 50.0 µm / Calibrated defocus max: -3.0 µm / Calibrated defocus min: -1.0 µm / Calibrated magnification: 105000 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: -3.0 µm / Nominal defocus min: -1.0 µm / Nominal magnification: 105000 |
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
Final reconstruction | Number classes used: 1 Applied symmetry - Helical parameters - Δz: 3.14 Å Applied symmetry - Helical parameters - Δ&Phi: 65.9 ° Applied symmetry - Helical parameters - Axial symmetry: C1 (asymmetric) Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 185002 |
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Segment selection | Number selected: 351381 / Software - Name: RELION (ver. 2.0) |
Startup model | Type of model: NONE / Details: Fourier-Bessel indexing |
Final angle assignment | Type: NOT APPLICABLE / Software - Name: RELION (ver. 2.0) |
-Atomic model buiding 1
Details | The helical filament symmetry is only applied to the Pf4 coat protein and not the DNA. The reason for this is that the DNA bases are not resolved clearly due to averaging along the ssDNA genome of the phage, meaning that refinement of the protein into the map is of a higher quality than the ssDNA, where a poly-adenine model has been built. |
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Refinement | Space: REAL / Protocol: BACKBONE TRACE / Overall B value: 93.74 / Target criteria: Correlation coefficient |
Output model | ![]() PDB-6tup: |