7OUF image
Entry Detail
PDB ID:
7OUF
EMDB ID:
Keywords:
Title:
Structure of the STLV intasome:B56 complex bound to the strand-transfer inhibitor XZ450
Biological Source:
PDB Version:
Deposition Date:
2021-06-11
Release Date:
2021-08-18
Method Details:
Experimental Method:
Resolution:
3.00 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Integrase
Mutations:A219E
Chain IDs:A (auth: D), B (auth: E), F (auth: A), G (auth: B)
Chain Length:301
Number of Molecules:4
Biological Source:Simian T-lymphotropic virus 1
Polymer Type:polypeptide(L)
Description:Isoform 3 of PC4 and SFRS1-interacting protein,Isoform Gamma-1 of Serine/threonine-protein phosphatase 2A 56 kDa regulatory subunit gamma isoform
Chain IDs:C (auth: F), H (auth: C)
Chain Length:697
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(*AP*CP*TP*GP*TP*GP*TP*TP*TP*GP*GP*CP*GP*CP*TP*TP*CP*TP*CP*TP*C)-3')
Chain IDs:D (auth: I), I (auth: K)
Chain Length:30
Number of Molecules:2
Biological Source:Simian T-lymphotropic virus 1
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(*GP*AP*GP*AP*GP*AP*AP*GP*CP*GP*CP*CP*AP*AP*AP*CP*AP*CP*A)-3')
Chain IDs:E (auth: J), J (auth: H)
Chain Length:28
Number of Molecules:2
Biological Source:Simian T-lymphotropic virus 1
Primary Citation
Structural basis for the inhibition of HTLV-1 integration inferred from cryo-EM deltaretroviral intasome structures.
Nat Commun 12 4996 4996 (2021)
PMID: 34404793 DOI: 10.1038/s41467-021-25284-1

Abstact

Between 10 and 20 million people worldwide are infected with the human T-cell lymphotropic virus type 1 (HTLV-1). Despite causing life-threatening pathologies there is no therapeutic regimen for this deltaretrovirus. Here, we screened a library of integrase strand transfer inhibitor (INSTI) candidates built around several chemical scaffolds to determine their effectiveness in limiting HTLV-1 infection. Naphthyridines with substituents in position 6 emerged as the most potent compounds against HTLV-1, with XZ450 having highest efficacy in vitro. Using single-particle cryo-electron microscopy we visualised XZ450 as well as the clinical HIV-1 INSTIs raltegravir and bictegravir bound to the active site of the deltaretroviral intasome. The structures reveal subtle differences in the coordination environment of the Mg2+ ion pair involved in the interaction with the INSTIs. Our results elucidate the binding of INSTIs to the HTLV-1 intasome and support their use for pre-exposure prophylaxis and possibly future treatment of HTLV-1 infection.

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