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- EMDB-41711: Disulfide-stabilized HIV-1 CA hexamer in complex with PQBP1 Nt -

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Basic information

Entry
Database: EMDB / ID: EMD-41711
TitleDisulfide-stabilized HIV-1 CA hexamer in complex with PQBP1 Nt
Map data
Sample
  • Complex: HIV-1 CA hexamer bound to PQBP1 Nt peptide
    • Protein or peptide: Capsid protein p24
Keywordscapsid / innate immune sensor / VIRAL PROTEIN
Function / homology
Function and homology information


viral budding via host ESCRT complex / host multivesicular body / ISG15 antiviral mechanism / viral nucleocapsid / viral translational frameshifting / host cell nucleus / host cell plasma membrane / structural molecule activity / virion membrane / RNA binding ...viral budding via host ESCRT complex / host multivesicular body / ISG15 antiviral mechanism / viral nucleocapsid / viral translational frameshifting / host cell nucleus / host cell plasma membrane / structural molecule activity / virion membrane / RNA binding / zinc ion binding / membrane
Similarity search - Function
Gag protein p6 / Gag protein p6 / : / gag protein p24 N-terminal domain / Immunodeficiency lentiviral matrix, N-terminal / gag gene protein p17 (matrix protein) / Matrix protein, lentiviral and alpha-retroviral, N-terminal / Retroviral nucleocapsid Gag protein p24, C-terminal domain / Gag protein p24 C-terminal domain / Retroviral matrix protein ...Gag protein p6 / Gag protein p6 / : / gag protein p24 N-terminal domain / Immunodeficiency lentiviral matrix, N-terminal / gag gene protein p17 (matrix protein) / Matrix protein, lentiviral and alpha-retroviral, N-terminal / Retroviral nucleocapsid Gag protein p24, C-terminal domain / Gag protein p24 C-terminal domain / Retroviral matrix protein / Retrovirus capsid, C-terminal / Retrovirus capsid, N-terminal / zinc finger / Zinc knuckle / Zinc finger, CCHC-type superfamily / Zinc finger, CCHC-type / Zinc finger CCHC-type profile.
Similarity search - Domain/homology
Biological speciesHuman immunodeficiency virus 1
Methodsingle particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsPiacentini J / Pornillos O / Ganser-Pornillos BK
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)U54-AI170856 United States
CitationJournal: J Mol Biol / Year: 2024
Title: Molecular Determinants of PQBP1 Binding to the HIV-1 Capsid Lattice.
Authors: Juliana Piacentini / Dale S Allen / Barbie K Ganser-Pornillos / Sumit K Chanda / Sunnie M Yoh / Owen Pornillos /
Abstract: Human immunodeficiency virus type 1 (HIV-1) stimulates innate immune responses upon infection, including cyclic GMP-AMP synthase (cGAS) signaling that results in type I interferon production. HIV-1- ...Human immunodeficiency virus type 1 (HIV-1) stimulates innate immune responses upon infection, including cyclic GMP-AMP synthase (cGAS) signaling that results in type I interferon production. HIV-1-induced activation of cGAS requires the host cell factor polyglutamine binding protein 1 (PQBP1), an intrinsically disordered protein that bridges capsid recognition and cGAS recruitment. However, the molecular details of PQBP1 interactions with the HIV-1 capsid and their functional implications remain poorly understood. Here, we show that PQBP1 binds to HIV-1 capsids through charge complementing contacts between acidic residues in the N-terminal region of PQBP1 and an arginine ring in the central channel of the HIV-1 CA hexamer that makes up the viral capsid. These studies reveal the molecular details of PQBP1's primary interaction with the HIV-1 capsid and suggest that additional elements are likely to contribute to stable capsid binding.
History
DepositionAug 24, 2023-
Header (metadata) releaseMar 6, 2024-
Map releaseMar 6, 2024-
UpdateMar 6, 2024-
Current statusMar 6, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_41711.png

Downloads & links

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Map

FileDownload / File: emd_41711.map.gz / Format: CCP4 / Size: 42.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 224 pix.
= 241.92 Å		1.08 Å/pix.
x 224 pix.
= 241.92 Å		1.08 Å/pix.
x 224 pix.
= 241.92 Å

Surface

Projections

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.08 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.24
Minimum - Maximum-0.8492779 - 1.4863634
Average (Standard dev.)0.0005498107 (±0.03925489)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions224224224
Spacing224224224
CellA=B=C: 241.92001 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_41711_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_41711_half_map_2.map
Projections & Slices
AxesZYX

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Histogram

Histogram (log scale)

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Sample components

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Entire : HIV-1 CA hexamer bound to PQBP1 Nt peptide

EntireName: HIV-1 CA hexamer bound to PQBP1 Nt peptide
Components
  • Complex: HIV-1 CA hexamer bound to PQBP1 Nt peptide
    • Protein or peptide: Capsid protein p24

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Supramolecule #1: HIV-1 CA hexamer bound to PQBP1 Nt peptide

SupramoleculeName: HIV-1 CA hexamer bound to PQBP1 Nt peptide / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Human immunodeficiency virus 1

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Macromolecule #1: Capsid protein p24

MacromoleculeName: Capsid protein p24 / type: protein_or_peptide / ID: 1 / Number of copies: 6 / Enantiomer: LEVO
Source (natural)Organism: Human immunodeficiency virus 1
Molecular weightTheoretical: 25.461271 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString: PIVQNLQGQM VHQCISPRTL NAWVKVVEEK AFSPEVIPMF SALSCGATPQ DLNTMLNTVG GHQAAMQMLK ETINEEAAEW DRLHPVHAG PIAPGQMREP RGSDIAGTTS TLQEQIGWMT HNPPIPVGEI YKRWIILGLN KIVRMYSPTS ILDIRQGPKE P FRDYVDRF ...String:
PIVQNLQGQM VHQCISPRTL NAWVKVVEEK AFSPEVIPMF SALSCGATPQ DLNTMLNTVG GHQAAMQMLK ETINEEAAEW DRLHPVHAG PIAPGQMREP RGSDIAGTTS TLQEQIGWMT HNPPIPVGEI YKRWIILGLN KIVRMYSPTS ILDIRQGPKE P FRDYVDRF YKTLRAEQAS QEVKNAATET LLVQNANPDC KTILKALGPG ATLEEMMTAC QGVGGPGHKA RVL

UniProtKB: Gag polyprotein

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.5 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 312788
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

3h47


Chain - Source name: PDB / Chain - Initial model type: experimental model / Details: 3H47 chain A docked into map
RefinementSpace: REAL / Protocol: OTHER
Output model

PDB-8ty6:
Disulfide-stabilized HIV-1 CA hexamer in complex with PQBP1 Nt

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