3OS0

PFV strand transfer complex (STC) at 2.81 A resolution

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.81 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 

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This is version 1.1 of the entry. See complete history. 


Literature

The mechanism of retroviral integration from X-ray structures of its key intermediates

Maertens, G.N., Hare, S., Cherepanov, P.

(2010) Nature 468: 326-329

  • DOI: 10.1038/nature09517
  • Primary Citation of Related Structures:  
    3OS0, 3OS1, 3OS2

  • PubMed Abstract: 

    • To establish productive infection, a retrovirus must insert a DNA replica of its genome into host cell chromosomal DNA. This process is operated by the intasome, a nucleoprotein complex composed of an integrase tetramer (IN) assembled on the viral DNA ends ...

    To establish productive infection, a retrovirus must insert a DNA replica of its genome into host cell chromosomal DNA. This process is operated by the intasome, a nucleoprotein complex composed of an integrase tetramer (IN) assembled on the viral DNA ends. The intasome engages chromosomal DNA within a target capture complex to carry out strand transfer, irreversibly joining the viral and cellular DNA molecules. Although several intasome/transpososome structures from the DDE(D) recombinase superfamily have been reported, the mechanics of target DNA capture and strand transfer by these enzymes remained unclear. Here we report crystal structures of the intasome from prototype foamy virus in complex with target DNA, elucidating the pre-integration target DNA capture and post-catalytic strand transfer intermediates of the retroviral integration process. The cleft between IN dimers within the intasome accommodates chromosomal DNA in a severely bent conformation, allowing widely spaced IN active sites to access the scissile phosphodiester bonds. Our results resolve the structural basis for retroviral DNA integration and provide a framework for the design of INs with altered target sequences.

    Organizational Affiliation: 

    Division of Infectious Diseases, Imperial College London, St Mary's Campus, Norfolk Place, London W2 1PG, UK.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
IntegraseA, B395Human spumaretrovirusMutation(s): 0 
Gene Names: pol
EC: 2.7.7.49 (UniProt), 2.7.7.7 (UniProt), 3.1.26.4 (UniProt), 3.4.23 (UniProt), 2.7.7 (UniProt), 3.1 (UniProt)
UniProt
Find proteins for P14350 (Human spumaretrovirus)
Explore P14350 
Go to UniProtKB:  P14350
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP14350
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*AP*TP*TP*GP*TP*CP*AP*TP*GP*GP*AP*AP*TP*TP*TP*CP*GP*CP*A)-3')C 19N/A
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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (5'-D(*TP*GP*CP*GP*AP*AP*AP*TP*TP*CP*CP*AP*TP*GP*AP*CP*A)-3')D 17N/A
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Entity ID: 4
MoleculeChainsLengthOrganismImage
DNA (5'-D(*CP*CP*CP*GP*AP*G*GP*CP*AP*CP*GP*TP*G)-3')E [auth t]13N/A
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Entity ID: 5
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*CP*TP*AP*GP*CP*AP*CP*GP*TP*GP*CP*CP*TP*CP*GP*GP*G)-3')F [auth T]17N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN
Download Ideal Coordinates CCD File 
G [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
MG
Query on MG
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H [auth A],
I [auth B]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.81 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 159.859α = 90
b = 159.859β = 90
c = 125.108γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-11-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance