6U8Q

CryoEM structure of HIV-1 cleaved synaptic complex (CSC) intasome


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.67 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

A Peptide Derived from Lens Epithelium-Derived Growth Factor Stimulates HIV-1 DNA Integration and Facilitates Intasome Structural Studies.

Li, M.Chen, X.Wang, H.Jurado, K.A.Engelman, A.N.Craigie, R.

(2020) J Mol Biol 432: 2055-2066

  • DOI: https://doi.org/10.1016/j.jmb.2020.01.040
  • Primary Citation of Related Structures:  
    6U8Q, 6VDK

  • PubMed Abstract: 

    The low solubility and aggregation properties of HIV-1 integrase (IN) are major obstacles for biochemical and structural studies. The lens epithelium-derived growth factor (LEDGF) is a cellular factor that binds IN and tethers preintegration complexes to chromatin before integration. The LEDGF also stimulates HIV-1 IN DNA strand transfer activity and improves its solubility in vitro. We show that these properties are conferred by a short peptide spanning residues 178 to 197 of the LEDGF that encompasses its AT-hook DNA-binding elements. The peptide stimulates HIV-1 IN activity both in trans and in cis. Fusion of the peptide to either the N- or C-terminus of IN results in maximal stimulation of concerted integration activity and greatly improves the solubility of the protein and nucleoprotein complexes of IN with viral DNA ends (intasomes). High-resolution structures of HIV-1 intasomes are required to understand the mechanism of IN strand transfer inhibitors (INSTIs), which are front-line drugs for the treatment of HIV-1, and how the virus can develop resistance to INSTIs. We have previously determined the structure of the HIV-1 strand transfer complex intasome. The improved biophysical properties of intasomes assembled with LEDGF peptide fusion IN have enabled us to determine the structure of the cleaved synaptic complex intasome, which is the direct target of INSTIs.


  • Organizational Affiliation

    Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, USA.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Integrase364Human immunodeficiency virus 1Mutation(s): 0 
EC: 2.7.7
UniProt
Find proteins for P12497 (Human immunodeficiency virus type 1 group M subtype B (isolate NY5))
Explore P12497 
Go to UniProtKB:  P12497
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP12497
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (27-MER)C [auth E],
G
27Escherichia coli
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (25-MER)D [auth F],
H
25Escherichia coli
Sequence Annotations
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  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
DLU BindingDB:  6U8Q IC50: min: 0.5, max: 68 (nM) from 4 assay(s)
EC50: min: 1.5, max: 6.8 (nM) from 3 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.67 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)United StatesA1070042
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)United StatesDK036169

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-05
    Type: Initial release
  • Version 1.1: 2020-03-04
    Changes: Database references
  • Version 1.2: 2020-05-27
    Changes: Database references
  • Version 1.3: 2024-03-20
    Changes: Data collection, Database references, Derived calculations