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- EMDB-10229: Structure of the native full-length HIV-1 capsid protein in helic... -

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Basic information

Entry
Database: EMDB / ID: EMD-10229
TitleStructure of the native full-length HIV-1 capsid protein in helical assembly (-13,8)
Map data
Sample
  • Complex: In vitro assembled HIV-1 capsid in tubular assembly
    • Protein or peptide: Gag protein
KeywordsHIV / capsid / hexamer / helical assembly / curvature / VIRAL PROTEIN
Function / homology
Function and homology information


integrase activity / Integration of viral DNA into host genomic DNA / Autointegration results in viral DNA circles / Minus-strand DNA synthesis / Plus-strand DNA synthesis / Uncoating of the HIV Virion / 2-LTR circle formation / Vpr-mediated nuclear import of PICs / Early Phase of HIV Life Cycle / Integration of provirus ...integrase activity / Integration of viral DNA into host genomic DNA / Autointegration results in viral DNA circles / Minus-strand DNA synthesis / Plus-strand DNA synthesis / Uncoating of the HIV Virion / 2-LTR circle formation / Vpr-mediated nuclear import of PICs / Early Phase of HIV Life Cycle / Integration of provirus / APOBEC3G mediated resistance to HIV-1 infection / viral process / Binding and entry of HIV virion / viral life cycle / HIV-1 retropepsin / symbiont-mediated activation of host apoptosis / retroviral ribonuclease H / exoribonuclease H / exoribonuclease H activity / Assembly Of The HIV Virion / Budding and maturation of HIV virion / host multivesicular body / protein processing / viral genome integration into host DNA / RNA-directed DNA polymerase / establishment of integrated proviral latency / viral penetration into host nucleus / RNA stem-loop binding / RNA-directed DNA polymerase activity / RNA-DNA hybrid ribonuclease activity / Transferases; Transferring phosphorus-containing groups; Nucleotidyltransferases / viral capsid / peptidase activity / host cell / viral nucleocapsid / DNA recombination / DNA-directed DNA polymerase / aspartic-type endopeptidase activity / Hydrolases; Acting on ester bonds / DNA-directed DNA polymerase activity / symbiont-mediated suppression of host gene expression / viral translational frameshifting / lipid binding / symbiont entry into host cell / host cell nucleus / host cell plasma membrane / virion membrane / structural molecule activity / DNA binding / zinc ion binding / identical protein binding / membrane
Similarity search - Function
: / gag protein p24 N-terminal domain / Reverse transcriptase connection / Reverse transcriptase connection domain / Reverse transcriptase thumb / Reverse transcriptase thumb domain / Integrase Zinc binding domain / Zinc finger integrase-type profile. / Integrase-like, N-terminal / Integrase DNA binding domain ...: / gag protein p24 N-terminal domain / Reverse transcriptase connection / Reverse transcriptase connection domain / Reverse transcriptase thumb / Reverse transcriptase thumb domain / Integrase Zinc binding domain / Zinc finger integrase-type profile. / Integrase-like, N-terminal / Integrase DNA binding domain / Integrase, C-terminal domain superfamily, retroviral / Integrase, N-terminal zinc-binding domain / Integrase, C-terminal, retroviral / Integrase DNA binding domain profile. / Immunodeficiency lentiviral matrix, N-terminal / gag gene protein p17 (matrix protein) / RNase H / Integrase core domain / Integrase, catalytic core / Integrase catalytic domain profile. / Retropepsin-like catalytic domain / Matrix protein, lentiviral and alpha-retroviral, N-terminal / Retroviral nucleocapsid Gag protein p24, C-terminal domain / Gag protein p24 C-terminal domain / RNase H type-1 domain profile. / Ribonuclease H domain / Retropepsins / Retroviral aspartyl protease / Aspartyl protease, retroviral-type family profile. / Peptidase A2A, retrovirus, catalytic / Reverse transcriptase domain / Retrovirus capsid, C-terminal / Reverse transcriptase (RNA-dependent DNA polymerase) / Reverse transcriptase (RT) catalytic domain profile. / Retroviral matrix protein / Retrovirus capsid, N-terminal / zinc finger / Zinc knuckle / Zinc finger, CCHC-type superfamily / Zinc finger, CCHC-type / Zinc finger CCHC-type profile. / Aspartic peptidase, active site / Eukaryotic and viral aspartyl proteases active site. / Aspartic peptidase domain superfamily / Ribonuclease H superfamily / Ribonuclease H-like superfamily / Reverse transcriptase/Diguanylate cyclase domain / DNA/RNA polymerase superfamily
Similarity search - Domain/homology
Gag-Pol polyprotein / Gag protein
Similarity search - Component
Biological speciesHuman immunodeficiency virus 1
Methodhelical reconstruction / cryo EM / Resolution: 4.5 Å
AuthorsNi T / Gerard S
Funding support United Kingdom, United States, 2 items
OrganizationGrant numberCountry
Wellcome Trust206422/Z/17/Z United Kingdom
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)P50AI150481 United States
CitationJournal: Nat Struct Mol Biol / Year: 2020
Title: Intrinsic curvature of the HIV-1 CA hexamer underlies capsid topology and interaction with cyclophilin A.
Authors: Tao Ni / Samuel Gerard / Gongpu Zhao / Kyle Dent / Jiying Ning / Jing Zhou / Jiong Shi / Jordan Anderson-Daniels / Wen Li / Sooin Jang / Alan N Engelman / Christopher Aiken / Peijun Zhang /
Abstract: The mature retrovirus capsid consists of a variably curved lattice of capsid protein (CA) hexamers and pentamers. High-resolution structures of the curved assembly, or in complex with host factors, ...The mature retrovirus capsid consists of a variably curved lattice of capsid protein (CA) hexamers and pentamers. High-resolution structures of the curved assembly, or in complex with host factors, have not been available. By devising cryo-EM methodologies for exceedingly flexible and pleomorphic assemblies, we have determined cryo-EM structures of apo-CA hexamers and in complex with cyclophilin A (CypA) at near-atomic resolutions. The CA hexamers are intrinsically curved, flexible and asymmetric, revealing the capsomere and not the previously touted dimer or trimer interfaces as the key contributor to capsid curvature. CypA recognizes specific geometries of the curved lattice, simultaneously interacting with three CA protomers from adjacent hexamers via two noncanonical interfaces, thus stabilizing the capsid. By determining multiple structures from various helical symmetries, we further revealed the essential plasticity of the CA molecule, which allows formation of continuously curved conical capsids and the mechanism of capsid pattern sensing by CypA.
History
DepositionAug 16, 2019-
Header (metadata) releaseAug 26, 2020-
Map releaseAug 26, 2020-
UpdateOct 23, 2024-
Current statusOct 23, 2024Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.014
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.014
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6skn
  • Surface level: 0.014
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-6skn
  • Imaged by Jmol
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Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_10229.png

Downloads & links

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Map

FileDownload / File: emd_10229.map.gz / Format: CCP4 / Size: 1.4 GB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 720 pix.
= 763.2 Å		1.06 Å/pix.
x 720 pix.
= 763.2 Å		1.06 Å/pix.
x 720 pix.
= 763.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.06 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.014 / Movie #1: 0.014
Minimum - Maximum-0.015303407 - 0.03707811
Average (Standard dev.)0.00018110547 (±0.001423524)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions720720720
Spacing720720720
CellA=B=C: 763.19995 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.061.061.06
M x/y/z720720720
origin x/y/z0.0000.0000.000
length x/y/z763.200763.200763.200
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS720720720
D min/max/mean-0.0150.0370.000

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Supplemental data

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Mask #1

Fileemd_10229_msk_1.map
Projections & Slices
AxesZYX

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Half map: #2

Fileemd_10229_half_map_1.map
Projections & Slices
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Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_10229_half_map_2.map
Projections & Slices
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Sample components

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Entire : In vitro assembled HIV-1 capsid in tubular assembly

EntireName: In vitro assembled HIV-1 capsid in tubular assembly
Components
  • Complex: In vitro assembled HIV-1 capsid in tubular assembly
    • Protein or peptide: Gag protein

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Supramolecule #1: In vitro assembled HIV-1 capsid in tubular assembly

SupramoleculeName: In vitro assembled HIV-1 capsid in tubular assembly / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Human immunodeficiency virus 1

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Macromolecule #1: Gag protein

MacromoleculeName: Gag protein / type: protein_or_peptide / ID: 1 / Number of copies: 18 / Enantiomer: LEVO
Source (natural)Organism: Human immunodeficiency virus 1
Molecular weightTheoretical: 25.606383 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: PIVQNIQGQM VHQAISPRTL NAWVKVVEEK AFSPEVIPMF SALSEGATPQ DLNTMLNTVG GHQAAMQMLK ETINEEAAEW DRVHPVHAG PIAPGQMREP RGSDIAGTTS TLQEQIGWMT NNPPIPVGEI YKRWIILGLN KIVRMYSPTS ILDIRQGPKE P FRDYVDRF ...String:
PIVQNIQGQM VHQAISPRTL NAWVKVVEEK AFSPEVIPMF SALSEGATPQ DLNTMLNTVG GHQAAMQMLK ETINEEAAEW DRVHPVHAG PIAPGQMREP RGSDIAGTTS TLQEQIGWMT NNPPIPVGEI YKRWIILGLN KIVRMYSPTS ILDIRQGPKE P FRDYVDRF YKTLRAEQAS QEVKNWMTET LLVQNANPDC KTILKALGPA ATLEEMMTAC QGVGGPGHKA RVL

UniProtKB: Gag protein

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Experimental details

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Structure determination

Methodcryo EM
Processinghelical reconstruction
Aggregation statehelical array

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Sample preparation

Concentration2 mg/mL
BufferpH: 8
VitrificationCryogen name: ETHANE
DetailsPurified capsid protein were assembled in the presence of Cyclophilin A.

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Number real images: 6500 / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 100.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionApplied symmetry - Helical parameters - Δz: 7.11 Å
Applied symmetry - Helical parameters - Δ&Phi: 138.14 °
Applied symmetry - Helical parameters - Axial symmetry: C1 (asymmetric)
Resolution.type: BY AUTHOR / Resolution: 4.5 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 2.0; 3.0) / Number images used: 207264
Startup modelType of model: NONE
Final angle assignmentType: NOT APPLICABLE / Software - Name: RELION (ver. 2.0; 3.0)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

4xfx


Chain - Chain ID: A / Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: FLEXIBLE FIT / Overall B value: 72.14 / Target criteria: Cross-correlation coefficient
Output model

PDB-6skn:
Structure of the native full-length HIV-1 capsid protein in helical assembly (-13,8)

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