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- EMDB-2355: Negative staining three dimensional reconstruction of bacteriopha... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-2355 | |||||||||
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Title | Negative staining three dimensional reconstruction of bacteriophage T7 large terminase | |||||||||
![]() | Threedimensional reconstruction of bacteriophage T7 large terminase | |||||||||
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![]() | ATPase / bacteriophage / DNA translocation / Packaging / single-particle reconstruction / terminase. | |||||||||
Function / homology | ![]() : / viral terminase, large subunit / viral DNA genome packaging / nuclease activity / Hydrolases; Acting on ester bonds; Endodeoxyribonucleases producing 5'-phosphomonoesters / chromosome organization / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / endonuclease activity / nucleotide binding / ATP hydrolysis activity ...: / viral terminase, large subunit / viral DNA genome packaging / nuclease activity / Hydrolases; Acting on ester bonds; Endodeoxyribonucleases producing 5'-phosphomonoesters / chromosome organization / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / endonuclease activity / nucleotide binding / ATP hydrolysis activity / ATP binding / metal ion binding Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / negative staining / Resolution: 16.0 Å | |||||||||
![]() | Dauden MI / Martin-Benito J / Sanchez-Ferrero JC / Pulido-Cid M / Valpuesta JM / Carrascosa JL | |||||||||
![]() | ![]() Title: Large terminase conformational change induced by connector binding in bacteriophage T7. Authors: María I Daudén / Jaime Martín-Benito / Juan C Sánchez-Ferrero / Mar Pulido-Cid / José M Valpuesta / José L Carrascosa / ![]() Abstract: During bacteriophage morphogenesis DNA is translocated into a preformed prohead by the complex formed by the portal protein, or connector, plus the terminase, which are located at an especial prohead ...During bacteriophage morphogenesis DNA is translocated into a preformed prohead by the complex formed by the portal protein, or connector, plus the terminase, which are located at an especial prohead vertex. The terminase is a powerful motor that converts ATP hydrolysis into mechanical movement of the DNA. Here, we have determined the structure of the T7 large terminase by electron microscopy. The five terminase subunits assemble in a toroid that encloses a channel wide enough to accommodate dsDNA. The structure of the complete connector-terminase complex is also reported, revealing the coupling between the terminase and the connector forming a continuous channel. The structure of the terminase assembled into the complex showed a different conformation when compared with the isolated terminase pentamer. To understand in molecular terms the terminase morphological change, we generated the terminase atomic model based on the crystallographic structure of its phage T4 counterpart. The docking of the threaded model in both terminase conformations showed that the transition between the two states can be achieved by rigid body subunit rotation in the pentameric assembly. The existence of two terminase conformations and its possible relation to the sequential DNA translocation may shed light into the molecular bases of the packaging mechanism of bacteriophage T7. | |||||||||
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 | ![]() | 1.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 10.7 KB 10.7 KB | Display Display | ![]() |
Images | ![]() | 98.5 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 4bijMC ![]() 2356C ![]() 4bilC 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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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Threedimensional reconstruction of bacteriophage T7 large terminase | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 4.4 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 : Full-length large terminase of bacteriophage T7
Entire | Name: Full-length large terminase of bacteriophage T7 |
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Components |
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-Supramolecule #1000: Full-length large terminase of bacteriophage T7
Supramolecule | Name: Full-length large terminase of bacteriophage T7 / type: sample / ID: 1000 / Oligomeric state: pentamer / Number unique components: 1 |
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Molecular weight | Theoretical: 335 KDa |
-Macromolecule #1: DNA maturase B
Macromolecule | Name: DNA maturase B / type: protein_or_peptide / ID: 1 Name.synonym: gp19, large terminase, DNA-packaging protein B Details: gp19 monomer is a 67 kDa protein / Number of copies: 5 / Oligomeric state: Pentamer / Recombinant expression: Yes |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 335 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | UniProtKB: Terminase, large subunit GO: GO: 0090305, nucleotide binding, nuclease activity, endonuclease activity, ATP binding |
-Experimental details
-Structure determination
Method | negative staining |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.4 Details: 50 mM Sodium Phosphate buffer pH 7, 300 mM NaCl, 10 mM MgCl2, 1 mM ADP, 5 mM DTT and 20% (v/v) glycerol. |
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Staining | Type: NEGATIVE Details: GraFix-fixated proteins stained on 2% w/v uranyl acetate for 1 min. |
Grid | Details: Cu-collodion grids with thin carbon support, glow discharged. |
Vitrification | Cryogen name: NONE / Instrument: OTHER |
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Electron microscopy
Microscope | FEI TECNAI F20 |
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Alignment procedure | Legacy - Astigmatism: FFT live |
Date | Oct 23, 2009 |
Image recording | Category: CCD / Film or detector model: FEI EAGLE (4k x 4k) / Digitization - Sampling interval: 15 µm / Number real images: 1005 / Bits/pixel: 16 |
Electron beam | Acceleration voltage: 100 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.26 mm / Nominal defocus max: 3.2 µm / Nominal defocus min: 1.5 µm / Nominal magnification: 67000 |
Sample stage | Specimen holder: GATAN convetional holder / Specimen holder model: SIDE ENTRY, EUCENTRIC |
Experimental equipment | ![]() Model: Tecnai F20 / Image courtesy: FEI Company |
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Image processing
Details | The particles were selected using Maximum Likelihood procedures form an initial set of 14097 particles. |
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CTF correction | Details: Each plate |
Final reconstruction | Applied symmetry - Point group: C5 (5 fold cyclic) / Algorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 16.0 Å / Resolution method: FSC 0.33 CUT-OFF / Software - Name: XMIPP, EMAN, Spider / Number images used: 3650 |
Final angle assignment | Details: SPIDER |