8SZK image
Deposition Date 2023-05-30
Release Date 2024-06-05
Last Version Date 2025-05-28
Entry Detail
PDB ID:
8SZK
Keywords:
Title:
The cryo-EM structure of PPP2R5A/HIV-1 Vif/CBFb/EloB/EloC complex
Biological Source:
Method Details:
Experimental Method:
Resolution:
3.58 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Elongin-B
Gene (Uniprot):ELOB
Chain IDs:A
Chain Length:118
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Elongin-C
Gene (Uniprot):ELOC
Chain IDs:B
Chain Length:96
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Core-binding factor subunit beta
Gene (Uniprot):CBFB
Chain IDs:C
Chain Length:201
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Serine/threonine-protein phosphatase 2A 56 kDa regulatory subunit alpha isoform
Gene (Uniprot):PPP2R5A
Chain IDs:E (auth: D)
Chain Length:486
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Virion infectivity factor
Gene (Uniprot):vif
Chain IDs:D (auth: G)
Chain Length:176
Number of Molecules:1
Biological Source:Human immunodeficiency virus type 1 (NEW YORK-5 ISOLATE)
Ligand Molecules
Primary Citation
Structural insights into PPP2R5A degradation by HIV-1 Vif.
Nat.Struct.Mol.Biol. 31 1492 1501 (2024)
PMID: 38789685 DOI: 10.1038/s41594-024-01314-6

Abstact

HIV-1 Vif recruits host cullin-RING-E3 ubiquitin ligase and CBFβ to degrade the cellular APOBEC3 antiviral proteins through diverse interactions. Recent evidence has shown that Vif also degrades the regulatory subunits PPP2R5(A-E) of cellular protein phosphatase 2A to induce G2/M cell cycle arrest. As PPP2R5 proteins bear no functional or structural resemblance to A3s, it is unclear how Vif can recognize different sets of proteins. Here we report the cryogenic-electron microscopy structure of PPP2R5A in complex with HIV-1 Vif-CBFβ-elongin B-elongin C at 3.58 Å resolution. The structure shows PPP2R5A binds across the Vif molecule, with biochemical and cellular studies confirming a distinct Vif-PPP2R5A interface that partially overlaps with those for A3s. Vif also blocks a canonical PPP2R5A substrate-binding site, indicating that it suppresses the phosphatase activities through both degradation-dependent and degradation-independent mechanisms. Our work identifies critical Vif motifs regulating the recognition of diverse A3 and PPP2R5A substrates, whereby disruption of these host-virus protein interactions could serve as potential targets for HIV-1 therapeutics.

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Primary Citation of related structures