7KU7

Cryo-EM structure of Rous sarcoma virus cleaved synaptic complex (CSC) with HIV-1 integrase strand transfer inhibitor MK-2048. Cluster identified by 3-dimensional variability analysis in cryoSPARC.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Cryo-EM structure of the Rous sarcoma virus octameric cleaved synaptic complex intasome.

Pandey, K.K.Bera, S.Shi, K.Rau, M.J.Oleru, A.V.Fitzpatrick, J.A.J.Engelman, A.N.Aihara, H.Grandgenett, D.P.

(2021) Commun Biol 4: 330-330

  • DOI: https://doi.org/10.1038/s42003-021-01855-2
  • Primary Citation of Related Structures:  
    7JN3, 7KU7, 7KUI

  • PubMed Abstract: 

    Despite conserved catalytic integration mechanisms, retroviral intasomes composed of integrase (IN) and viral DNA possess diverse structures with variable numbers of IN subunits. To investigate intasome assembly mechanisms, we employed the Rous sarcoma virus (RSV) IN dimer that assembles a precursor tetrameric structure in transit to the mature octameric intasome. We determined the structure of RSV octameric intasome stabilized by a HIV-1 IN strand transfer inhibitor using single particle cryo-electron microscopy. The structure revealed significant flexibility of the two non-catalytic distal IN dimers along with previously unrecognized movement of the conserved intasome core, suggesting ordered conformational transitions between intermediates that may be important to capture the target DNA. Single amino acid substitutions within the IN C-terminal domain affected intasome assembly and function in vitro and infectivity of pseudotyped RSV virions. Unexpectedly, 17 C-terminal amino acids of IN were dispensable for virus infection despite regulating the transition of the tetrameric intasome to the octameric form in vitro. We speculate that this region may regulate the binding of highly flexible distal IN dimers to the intasome core to form the octameric complex. Our studies reveal key steps in the assembly of RSV intasomes.


  • Organizational Affiliation

    Department of Molecular Microbiology and Immunology, School of Medicine, Saint Louis University, St. Louis, MO, USA. krishan.pandey@health.slu.edu.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
integrase
A, B, C, D, E
A, B, C, D, E, F, G, H
278Rous sarcoma virus (strain Schmidt-Ruppin A)Mutation(s): 0 
Gene Names: gag-pol
EC: 2.7.7
UniProt
Find proteins for P03354 (Rous sarcoma virus subgroup C (strain Prague))
Explore P03354 
Go to UniProtKB:  P03354
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03354
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(*AP*AP*TP*GP*TP*TP*GP*TP*CP*TP*TP*AP*TP*GP*CP*AP*AP*T)-3')
I, K
18Rous sarcoma virus (strain Schmidt-Ruppin A)
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (5'-D(*AP*TP*TP*GP*CP*AP*TP*AP*AP*GP*AP*CP*AP*AP*CP*A)-3')
J, L
16Rous sarcoma virus (strain Schmidt-Ruppin A)
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ZZX (Subject of Investigation/LOI)
Query on ZZX

Download Ideal Coordinates CCD File 
S [auth J],
T [auth L]
(6S)-2-(3-chloro-4-fluorobenzyl)-8-ethyl-10-hydroxy-N,6-dimethyl-1,9-dioxo-1,2,6,7,8,9-hexahydropyrazino[1',2':1,5]pyrrolo[2,3-d]pyridazine-4-carboxamide
C21 H21 Cl F N5 O4
JSRREMIKIHJGAA-JTQLQIEISA-N
ZN
Query on ZN

Download Ideal Coordinates CCD File 
M [auth A],
P [auth E]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
N [auth A],
O [auth A],
Q [auth E],
R [auth E]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI127196
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM118047

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-17
    Type: Initial release
  • Version 1.1: 2021-03-24
    Changes: Database references
  • Version 1.2: 2024-03-06
    Changes: Data collection, Database references, Refinement description