+Open data
-Basic information
Entry | Database: PDB / ID: 5cz1 | ||||||
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Title | Crystal structure of the catalytic core domain of MMTV integrase | ||||||
Components | integrase | ||||||
Keywords | HYDROLASE / integrase / POL / retrovirus / catalytic core domain | ||||||
Function / homology | Function and homology information dUTP diphosphatase / dUTP diphosphatase activity / Hydrolases; Acting on peptide bonds (peptidases); Aspartic endopeptidases / ribonuclease H / DNA integration / RNA-directed DNA polymerase / viral genome integration into host DNA / establishment of integrated proviral latency / RNA-directed DNA polymerase activity / Transferases; Transferring phosphorus-containing groups; Nucleotidyltransferases ...dUTP diphosphatase / dUTP diphosphatase activity / Hydrolases; Acting on peptide bonds (peptidases); Aspartic endopeptidases / ribonuclease H / DNA integration / RNA-directed DNA polymerase / viral genome integration into host DNA / establishment of integrated proviral latency / RNA-directed DNA polymerase activity / Transferases; Transferring phosphorus-containing groups; Nucleotidyltransferases / RNA-DNA hybrid ribonuclease activity / viral nucleocapsid / DNA recombination / structural constituent of virion / Hydrolases; Acting on ester bonds / DNA-directed DNA polymerase / aspartic-type endopeptidase activity / DNA-directed DNA polymerase activity / symbiont entry into host cell / proteolysis / DNA binding / RNA binding / zinc ion binding Similarity search - Function | ||||||
Biological species | Mouse mammary tumor virus | ||||||
Method | X-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 1.7 Å | ||||||
Authors | Cook, N. / Ballandras-Colas, A. / Engelman, A. / Cherepanov, P. | ||||||
Funding support | United States, 1items
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Citation | Journal: Nature / Year: 2016 Title: Cryo-EM reveals a novel octameric integrase structure for betaretroviral intasome function. Authors: Allison Ballandras-Colas / Monica Brown / Nicola J Cook / Tamaria G Dewdney / Borries Demeler / Peter Cherepanov / Dmitry Lyumkis / Alan N Engelman / Abstract: Retroviral integrase catalyses the integration of viral DNA into host target DNA, which is an essential step in the life cycle of all retroviruses. Previous structural characterization of integrase- ...Retroviral integrase catalyses the integration of viral DNA into host target DNA, which is an essential step in the life cycle of all retroviruses. Previous structural characterization of integrase-viral DNA complexes, or intasomes, from the spumavirus prototype foamy virus revealed a functional integrase tetramer, and it is generally believed that intasomes derived from other retroviral genera use tetrameric integrase. However, the intasomes of orthoretroviruses, which include all known pathogenic species, have not been characterized structurally. Here, using single-particle cryo-electron microscopy and X-ray crystallography, we determine an unexpected octameric integrase architecture for the intasome of the betaretrovirus mouse mammary tumour virus. The structure is composed of two core integrase dimers, which interact with the viral DNA ends and structurally mimic the integrase tetramer of prototype foamy virus, and two flanking integrase dimers that engage the core structure via their integrase carboxy-terminal domains. Contrary to the belief that tetrameric integrase components are sufficient to catalyse integration, the flanking integrase dimers were necessary for mouse mammary tumour virus integrase activity. The integrase octamer solves a conundrum for betaretroviruses as well as alpharetroviruses by providing critical carboxy-terminal domains to the intasome core that cannot be provided in cis because of evolutionarily restrictive catalytic core domain-carboxy-terminal domain linker regions. The octameric architecture of the intasome of mouse mammary tumour virus provides new insight into the structural basis of retroviral DNA integration. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 5cz1.cif.gz | 144 KB | Display | PDBx/mmCIF format |
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PDB format | pdb5cz1.ent.gz | 113.2 KB | Display | PDB format |
PDBx/mmJSON format | 5cz1.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/cz/5cz1 ftp://data.pdbj.org/pub/pdb/validation_reports/cz/5cz1 | HTTPS FTP |
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-Related structure data
Related structure data | 6440C 6441C 3jcaC 5cz2C 5d7uC 1asvS S: Starting model for refinement C: citing same article (ref.) |
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Similar structure data |
-Links
-Assembly
Deposited unit |
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Unit cell |
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-Components
#1: Protein | Mass: 19310.104 Da / Num. of mol.: 4 / Fragment: UNP residues 1487-1648 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Mouse mammary tumor virus / Gene: gag-pro-pol / Plasmid: pET20b(+) / Details (production host): cleavable His6 tag / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: O56220, UniProt: P03365*PLUS #2: Water | ChemComp-HOH / | |
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-Experimental details
-Experiment
Experiment | Method: X-RAY DIFFRACTION |
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-Sample preparation
Crystal | Density Matthews: 2.14 Å3/Da / Density % sol: 42.49 % |
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Crystal grow | Temperature: 291.15 K / Method: vapor diffusion, hanging drop Details: 12.5% PEG3350, 0.15 M Ammonium Citrate Tribasic, pH6.5. |
-Data collection
Diffraction | Mean temperature: 100 K | |||||||||
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Diffraction source | Source: SYNCHROTRON / Site: ESRF / Beamline: BM14 / Wavelength: 0.95372 / Wavelength: 1 Å | |||||||||
Detector | Type: MARMOSAIC 225 mm CCD / Detector: CCD / Date: Jun 27, 2015 | |||||||||
Radiation | Monochromator: Si111 / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray | |||||||||
Radiation wavelength |
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Reflection | Resolution: 1.7→46.62 Å / Num. obs: 69082 / % possible obs: 99.1 % / Redundancy: 5.2 % / Rmerge(I) obs: 0.06 / Net I/σ(I): 21 | |||||||||
Reflection shell | Resolution: 1.7→1.73 Å / Redundancy: 2.8 % / Rmerge(I) obs: 0.571 / Mean I/σ(I) obs: 2 / % possible all: 95.6 |
-Processing
Software |
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Refinement | Method to determine structure: MOLECULAR REPLACEMENT Starting model: 1ASV Resolution: 1.7→32.801 Å / SU ML: 0.2 / Cross valid method: FREE R-VALUE / σ(F): 1.96 / Phase error: 23.27 / Stereochemistry target values: ML
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Solvent computation | Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: LAST / Resolution: 1.7→32.801 Å
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Refine LS restraints |
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LS refinement shell |
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