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- PDB-7o0g: Structure of the foamy viral protease-reverse transcriptase in co... -
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Open data
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Basic information
Entry | Database: PDB / ID: 7o0g | ||||||
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Title | Structure of the foamy viral protease-reverse transcriptase in complex with RNA/DNA hybrid. | ||||||
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![]() | VIRAL PROTEIN / reverse trancscriptase / complex with RNA-DNA | ||||||
Function / homology | ![]() virion component / DNA integration / viral penetration into host nucleus / RNA-directed DNA polymerase activity / host cell / RNA-DNA hybrid ribonuclease activity / DNA recombination / host cell cytoplasm / nucleic acid binding / aspartic-type endopeptidase activity ...virion component / DNA integration / viral penetration into host nucleus / RNA-directed DNA polymerase activity / host cell / RNA-DNA hybrid ribonuclease activity / DNA recombination / host cell cytoplasm / nucleic acid binding / aspartic-type endopeptidase activity / DNA-directed DNA polymerase activity / proteolysis / metal ion binding / cytoplasm Similarity search - Function | ||||||
Biological species | ![]() synthetic construct (others) | ||||||
Method | ![]() ![]() ![]() | ||||||
![]() | Nowak, E. / Nowacka, M. / Nowotny, M. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structures of Substrate Complexes of Foamy Viral Protease-Reverse Transcriptase. Authors: Marzena Nowacka / Elżbieta Nowak / Mariusz Czarnocki-Cieciura / Justyna Jackiewicz / Krzysztof Skowronek / Roman H Szczepanowski / Birgitta M Wöhrl / Marcin Nowotny / ![]() ![]() Abstract: Reverse transcriptases (RTs) use their DNA polymerase and RNase H activities to catalyze the conversion of single-stranded RNA to double-stranded DNA (dsDNA), a crucial process for the replication of ...Reverse transcriptases (RTs) use their DNA polymerase and RNase H activities to catalyze the conversion of single-stranded RNA to double-stranded DNA (dsDNA), a crucial process for the replication of retroviruses. Foamy viruses (FVs) possess a unique RT, which is a fusion with the protease (PR) domain. The mechanism of substrate binding by this enzyme has been unknown. Here, we report a crystal structure of monomeric full-length marmoset FV (MFV) PR-RT in complex with an RNA/DNA hybrid substrate. We also describe a structure of MFV PR-RT with an RNase H deletion in complex with a dsDNA substrate in which the enzyme forms an asymmetric homodimer. Cryo-electron microscopy reconstruction of the full-length MFV PR-RT-dsDNA complex confirmed the dimeric architecture. These findings represent the first structural description of nucleic acid binding by a foamy viral RT and demonstrate its ability to change its oligomeric state depending on the type of bound nucleic acid. Reverse transcriptases (RTs) are intriguing enzymes converting single-stranded RNA to dsDNA. Their activity is essential for retroviruses, which are divided into two subfamilies differing significantly in their life cycles: and . The latter family is much more ancient and comprises five genera. A unique feature of foamy viral RTs is that they contain N-terminal protease (PR) domains, which are not present in orthoretroviral enzymes. So far, no structural information for full-length foamy viral PR-RT interacting with nucleic substrates has been reported. Here, we present crystal and cryo-electron microscopy structures of marmoset foamy virus (MFV) PR-RT. These structures revealed the mode of binding of RNA/DNA and dsDNA substrates. Moreover, unexpectedly, the structures and biochemical data showed that foamy viral PR-RT can adopt both a monomeric configuration, which is observed in our structures in the presence of an RNA/DNA hybrid, and an asymmetric dimer arrangement, which we observed in the presence of dsDNA. | ||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 403.1 KB | Display | ![]() |
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PDB format | ![]() | 272.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 453.2 KB | Display | ![]() |
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Full document | ![]() | 462.4 KB | Display | |
Data in XML | ![]() | 27.6 KB | Display | |
Data in CIF | ![]() | 37.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
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Links
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Assembly
Deposited unit | ![]()
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Unit cell |
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Components
#1: Protein | Mass: 85465.320 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Details: foamy virus Source: (gene. exp.) ![]() Gene: pol Production host: ![]() ![]() References: UniProt: D5JWV1, RNA-directed DNA polymerase, DNA-directed DNA polymerase, ribonuclease H |
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#2: RNA chain | Mass: 5805.476 Da / Num. of mol.: 1 / Source method: obtained synthetically / Details: Electron density was not observed for the last G / Source: (synth.) synthetic construct (others) |
#3: DNA chain | Mass: 4529.950 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others) |
#4: Water | ChemComp-HOH / |
-Experimental details
-Experiment
Experiment | Method: ![]() |
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Sample preparation
Crystal | Density Matthews: 3.65 Å3/Da / Density % sol: 66.29 % |
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Crystal grow | Temperature: 291 K / Method: vapor diffusion, sitting drop / pH: 6.5 / Details: PEG 20000, PEG MME550, MES/imidazole |
-Data collection
Diffraction | Mean temperature: 100 K / Serial crystal experiment: N |
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Diffraction source | Source: ![]() ![]() ![]() |
Detector | Type: DECTRIS PILATUS 6M / Detector: PIXEL / Date: Aug 26, 2019 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 0.97931 Å / Relative weight: 1 |
Reflection | Resolution: 3.1→50 Å / Num. obs: 26673 / % possible obs: 99.8 % / Redundancy: 13.1 % / Biso Wilson estimate: 119.84 Å2 / CC1/2: 0.998 / Net I/σ(I): 21.1 |
Reflection shell | Resolution: 3.1→3.28 Å / Redundancy: 13.5 % / Num. unique obs: 4179 / CC1/2: 0.821 / % possible all: 99.3 |
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Processing
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Refinement | Method to determine structure: ![]() Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
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Solvent computation | Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 126.78 Å2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: LAST / Resolution: 3.1→48.52 Å
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Refine LS restraints |
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LS refinement shell |
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Refinement TLS params. | Method: refined / Refine-ID: X-RAY DIFFRACTION
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Refinement TLS group | Refine-ID: X-RAY DIFFRACTION
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