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- PDB-8g6k: HIV-1 CA lattice bound to IP6; from capsid-like particles -

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Basic information

Entry
Database: PDB / ID: 8g6k
TitleHIV-1 CA lattice bound to IP6; from capsid-like particles
ComponentsCapsid proteinCapsid
KeywordsVIRUS LIKE PARTICLE / HIV-1 / capsid / lattice / virus
Function / homology
Function and homology information


viral process / viral nucleocapsid / host cell cytoplasm / virion membrane / structural molecule activity / RNA binding / zinc ion binding / cytoplasm
Similarity search - Function
gag protein p24 N-terminal domain / Immunodeficiency lentiviral matrix, N-terminal / gag gene protein p17 (matrix protein) / Retroviral nucleocapsid Gag protein p24, C-terminal domain / Gag protein p24 C-terminal domain / Matrix protein, lentiviral and alpha-retroviral, N-terminal / Retrovirus capsid, C-terminal / Retroviral matrix protein / Retrovirus capsid, N-terminal / Zinc knuckle ...gag protein p24 N-terminal domain / Immunodeficiency lentiviral matrix, N-terminal / gag gene protein p17 (matrix protein) / Retroviral nucleocapsid Gag protein p24, C-terminal domain / Gag protein p24 C-terminal domain / Matrix protein, lentiviral and alpha-retroviral, N-terminal / Retrovirus capsid, C-terminal / Retroviral matrix protein / Retrovirus capsid, N-terminal / 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
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsHighland, C.M. / Dick, R.A.
Funding support United States, United Kingdom, 5items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01AI147890 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)5U54AI150472-09 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)U54AI170855-01 United States
National Science Foundation (NSF, United States)DMR-1719875 United States
Medical Research Council (MRC, United Kingdom)MC_UP_1201/16 United Kingdom
CitationJournal: Proc Natl Acad Sci U S A / Year: 2023
Title: Structural insights into HIV-1 polyanion-dependent capsid lattice formation revealed by single particle cryo-EM.
Authors: Carolyn M Highland / Aaron Tan / Clifton L Ricaña / John A G Briggs / Robert A Dick /
Abstract: The HIV-1 capsid houses the viral genome and interacts extensively with host cell proteins throughout the viral life cycle. It is composed of capsid protein (CA), which assembles into a conical ...The HIV-1 capsid houses the viral genome and interacts extensively with host cell proteins throughout the viral life cycle. It is composed of capsid protein (CA), which assembles into a conical fullerene lattice composed of roughly 200 CA hexamers and 12 CA pentamers. Previous structural analyses of individual CA hexamers and pentamers have provided valuable insight into capsid structure and function, but detailed structural information about these assemblies in the broader context of the capsid lattice is lacking. In this study, we combined cryoelectron tomography and single particle analysis (SPA) cryoelectron microscopy to determine structures of continuous regions of the capsid lattice containing both hexamers and pentamers. We also developed a method of liposome scaffold-based in vitro lattice assembly ("lattice templating") that enabled us to directly study the lattice under a wider range of conditions than has previously been possible. Using this approach, we identified a critical role for inositol hexakisphosphate in pentamer formation and determined the structure of the CA lattice bound to the capsid-targeting antiretroviral drug GS-6207 (lenacapavir). Our work reveals key structural details of the mature HIV-1 CA lattice and establishes the combination of lattice templating and SPA as a robust strategy for studying retroviral capsid structure and capsid interactions with host proteins and antiviral compounds.
History
DepositionFeb 15, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0May 3, 2023Provider: repository / Type: Initial release
Revision 1.1May 10, 2023Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2May 24, 2023Group: Derived calculations
Category: pdbx_struct_assembly / pdbx_struct_assembly_gen / pdbx_struct_oper_list

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Capsid protein
B: Capsid protein
C: Capsid protein
D: Capsid protein
E: Capsid protein
F: Capsid protein
G: Capsid protein


Theoretical massNumber of molelcules
Total (without water)180,3317
Polymers180,3317
Non-polymers00
Water0
1
A: Capsid protein
B: Capsid protein
C: Capsid protein
D: Capsid protein
E: Capsid protein
F: Capsid protein
G: Capsid protein
x 5


Theoretical massNumber of molelcules
Total (without water)901,65735
Polymers901,65735
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation4
2


  • Idetical with deposited unit
  • point asymmetric unit
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
3


  • Idetical with deposited unit in distinct coordinate
  • point asymmetric unit, std point frame
TypeNameSymmetry operationNumber
transform to point frame1

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Components

#1: Protein
Capsid protein / Capsid


Mass: 25761.623 Da / Num. of mol.: 7
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Human immunodeficiency virus 1 / Gene: gag / Production host: Escherichia coli (E. coli) / References: UniProt: B6DRA0

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: HIV-1 CA lattice bound to IP6; from capsid-like particles
Type: COMPLEX
Details: HIV-1 capsid-like particles assembled from capsid (CA) protein and inositol hexakisphosphate (IP6) at pH 6.2
Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Human immunodeficiency virus 1
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 1600 nm / Nominal defocus min: 600 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 81428 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00411018
ELECTRON MICROSCOPYf_angle_d0.69114971
ELECTRON MICROSCOPYf_dihedral_angle_d4.0571459
ELECTRON MICROSCOPYf_chiral_restr0.0391678
ELECTRON MICROSCOPYf_plane_restr0.0041940

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