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- PDB-9d88: Gag CA-SP1 immature lattice from enveloped and perforated virus l... -

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Basic information

Entry
Database: PDB / ID: 9d88
TitleGag CA-SP1 immature lattice from enveloped and perforated virus like particles
ComponentsGag polyprotein
KeywordsVIRUS LIKE PARTICLE / HIV-1 / Gag / CA-SP1 / Inhibitor / virion assembly
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 / virion membrane / structural molecule activity / 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 / virion membrane / structural molecule activity / 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 / Retrovirus capsid, C-terminal ...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 / Retrovirus capsid, C-terminal / 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.
Similarity search - Domain/homology
INOSITOL HEXAKISPHOSPHATE / Gag polyprotein
Similarity search - Component
Biological speciesHuman immunodeficiency virus type 1
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.18 Å
AuthorsWu, C. / Meuser, M.E. / Xiong, Y.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)U54 AI170791 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01 AI178846 United States
CitationJournal: bioRxiv / Year: 2024
Title: Structural insights into inhibitor mechanisms on immature HIV-1 Gag lattice revealed by high-resolution single-particle cryo-EM.
Authors: Chunxiang Wu / Megan E Meuser / Juan S Rey / Hamed Meshkin / Rachel Yang / Swapnil Chandrakant Devarkar / Christian Freniere / Jiong Shi / Christopher Aiken / Juan R Perilla / Yong Xiong /
Abstract: HIV-1 inhibitors, such as Bevirimat (BVM) and Lenacapavir (LEN), block the production and maturation of infectious virions. However, their mechanisms remain unclear due to the absence of high- ...HIV-1 inhibitors, such as Bevirimat (BVM) and Lenacapavir (LEN), block the production and maturation of infectious virions. However, their mechanisms remain unclear due to the absence of high-resolution structures for BVM complexes and LEN's structural data being limited to the mature capsid. Utilizing perforated virus-like particles (VLPs) produced from mammalian cells, we developed an approach to determine cryo-electron microscopy (cryo-EM) structures of HIV-1 with inhibitors. This allowed for the first structural determination of the native immature HIV-1 particle with BVM and LEN bound inside the VLPs at high resolutions. Our findings offer a more accurate model of BVM engaging the Gag lattice and, importantly, demonstrate that LEN not only binds the mature capsid but also targets the immature lattice in a distinct manner. The binding of LEN induces a conformational change in the capsid protein (CA) region and alters the architecture of the Gag lattice, which may affect the maturation process. These insights expand our understanding of the inhibitory mechanisms of BVM and LEN on HIV-1 and provide valuable clues for the design of future inhibitors.
History
DepositionAug 19, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Oct 30, 2024Provider: repository / Type: Initial release
Revision 1.1Nov 20, 2024Group: Data collection / Category: em_admin / Item: _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Gag polyprotein
B: Gag polyprotein
C: Gag polyprotein
D: Gag polyprotein
E: Gag polyprotein
F: Gag polyprotein
G: Gag polyprotein
H: Gag polyprotein
I: Gag polyprotein
J: Gag polyprotein
K: Gag polyprotein
L: Gag polyprotein
M: Gag polyprotein
N: Gag polyprotein
O: Gag polyprotein
P: Gag polyprotein
Q: Gag polyprotein
R: Gag polyprotein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)456,76319
Polymers456,10318
Non-polymers6601
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Gag polyprotein / Pr55Gag


Mass: 25339.037 Da / Num. of mol.: 18 / Fragment: CA-SP1 domains (UNP residues 143-372) / Mutation: L231I
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Human immunodeficiency virus type 1 (NEW YORK-5 ISOLATE)
Strain: Clone pNL4-3 / Gene: gag / Cell line (production host): Expi293F / Production host: Homo sapiens (human) / References: UniProt: P12493
#2: Chemical ChemComp-IHP / INOSITOL HEXAKISPHOSPHATE / MYO-INOSITOL HEXAKISPHOSPHATE / INOSITOL 1,2,3,4,5,6-HEXAKISPHOSPHATE


Mass: 660.035 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C6H18O24P6 / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationY

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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: Human immunodeficiency virus type 1 (NEW YORK-5 ISOLATE)
Type: VIRUS
Details: NL-MA/NC DNA was transfected into Expi293F (ThermoTisher) cells and cultured in suspension culture. The enveloped virion like particles were purified by filtration and ultracentrifugation, ...Details: NL-MA/NC DNA was transfected into Expi293F (ThermoTisher) cells and cultured in suspension culture. The enveloped virion like particles were purified by filtration and ultracentrifugation, and directly used as cryo-EM sample.
Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Human immunodeficiency virus type 1 (NEW YORK-5 ISOLATE)
Strain: Clone pNL4-3
Source (recombinant)Organism: Homo sapiens (human) / Cell: Expi293F / Plasmid: NL-MA/NC
Details of virusEmpty: YES / Enveloped: YES / Isolate: STRAIN / Type: VIRUS-LIKE PARTICLE
Natural hostOrganism: Homo sapiens
Virus shellName: Gag
Buffer solutionpH: 7.4
Details: This is the final buffer in which the enveloped viral-like particle was resuspended. The Gag-CA-SP1 lattice is inside the virus-like particle and not directly in the buffer environment.
Buffer component
IDConc.NameFormulaBuffer-ID
110 mMTris-hydrocloride1
2100 mMsodium chlorideNaCl1
31 mMEthylenediaminetetraacetic acid1
SpecimenConc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: NL-MA/NC DNA was transfected into Expi293F (thermofisher) cells and cultured in suspension culture. The enveloped virion like particles were purified by filtration and ultracentrifugation, ...Details: NL-MA/NC DNA was transfected into Expi293F (thermofisher) cells and cultured in suspension culture. The enveloped virion like particles were purified by filtration and ultracentrifugation, and directly used as cryo-EM sample.
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R2/1
VitrificationInstrument: FEI VITROBOT MARK III / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 295 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 81000 X / Nominal defocus max: 2200 nm / Nominal defocus min: 1200 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.21_5207 / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C6 (6 fold cyclic)
3D reconstructionResolution: 3.18 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 205014 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model buildingPDB-ID: 9CWV

9cwv


Accession code: 9CWV / Source name: PDB / Type: experimental model
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 119.46 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.002232664
ELECTRON MICROSCOPYf_angle_d0.481344406
ELECTRON MICROSCOPYf_chiral_restr0.03624932
ELECTRON MICROSCOPYf_plane_restr0.00435808
ELECTRON MICROSCOPYf_dihedral_angle_d5.81534417

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