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- EMDB-25063: in situ SIVmac239-Env trimers on the surface of AT-2-inactivated ... -

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Basic information

Entry
Database: EMDB / ID: EMD-25063
Titlein situ SIVmac239-Env trimers on the surface of AT-2-inactivated virions
Map datain situ SIVmac239-Env trimers on the surface of AT-2-inactivated virions
Sample
  • Virus: Simian immunodeficiency virus
Biological speciesSimian immunodeficiency virus
Methodsubtomogram averaging / cryo EM / Resolution: 7.0 Å
AuthorsLiu J / Wang CY
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/Eunice Kennedy Shriver National Institute of Child Health & Human Development (NIH/NICHD) United States
CitationJournal: Nat Struct Mol Biol / Year: 2022
Title: Cryo-EM structures of prefusion SIV envelope trimer.
Authors: Jason Gorman / Chunyan Wang / Rosemarie D Mason / Alexandra F Nazzari / Hugh C Welles / Tongqing Zhou / Julian W Bess / Tatsiana Bylund / Myungjin Lee / Yaroslav Tsybovsky / Raffaello ...Authors: Jason Gorman / Chunyan Wang / Rosemarie D Mason / Alexandra F Nazzari / Hugh C Welles / Tongqing Zhou / Julian W Bess / Tatsiana Bylund / Myungjin Lee / Yaroslav Tsybovsky / Raffaello Verardi / Shuishu Wang / Yongping Yang / Baoshan Zhang / Reda Rawi / Brandon F Keele / Jeffrey D Lifson / Jun Liu / Mario Roederer / Peter D Kwong /
Abstract: Simian immunodeficiency viruses (SIVs) are lentiviruses that naturally infect non-human primates of African origin and seeded cross-species transmissions of HIV-1 and HIV-2. Here we report prefusion ...Simian immunodeficiency viruses (SIVs) are lentiviruses that naturally infect non-human primates of African origin and seeded cross-species transmissions of HIV-1 and HIV-2. Here we report prefusion stabilization and cryo-EM structures of soluble envelope (Env) trimers from rhesus macaque SIV (SIV) in complex with neutralizing antibodies. These structures provide residue-level definition for SIV-specific disulfide-bonded variable loops (V1 and V2), which we used to delineate variable-loop coverage of the Env trimer. The defined variable loops enabled us to investigate assembled Env-glycan shields throughout SIV, which we found to comprise both N- and O-linked glycans, the latter emanating from V1 inserts, which bound the O-link-specific lectin jacalin. We also investigated in situ SIV-Env trimers on virions, determining cryo-electron tomography structures at subnanometer resolutions for an antibody-bound complex and a ligand-free state. Collectively, these structures define the prefusion-closed structure of the SIV-Env trimer and delineate variable-loop and glycan-shielding mechanisms of immune evasion conserved throughout SIV evolution.
History
DepositionSep 29, 2021-
Header (metadata) releaseOct 5, 2022-
Map releaseOct 5, 2022-
UpdateApr 19, 2023-
Current statusApr 19, 2023Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_25063.png

Downloads & links

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Map

FileDownload / File: emd_25063.map.gz / Format: CCP4 / Size: 30.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationin situ SIVmac239-Env trimers on the surface of AT-2-inactivated virions
Voxel sizeX=Y=Z: 1.38 Å
Density
Contour LevelBy AUTHOR: 0.01
Minimum - Maximum-0.024806794 - 0.25254935
Average (Standard dev.)-1.626936e-11 (±0.006167115)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin-100-100-100
Dimensions200200200
Spacing200200200
CellA=B=C: 276.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Simian immunodeficiency virus

EntireName: Simian immunodeficiency virus
Components
  • Virus: Simian immunodeficiency virus

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Supramolecule #1: Simian immunodeficiency virus

SupramoleculeName: Simian immunodeficiency virus / type: virus / ID: 1 / Parent: 0 / NCBI-ID: 11723 / Sci species name: Simian immunodeficiency virus / Sci species strain: SIVmac239 / Virus type: VIRION / Virus isolate: STRAIN / Virus enveloped: Yes / Virus empty: No

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Experimental details

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Structure determination

Methodcryo EM
Processingsubtomogram averaging
Aggregation stateparticle

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Sample preparation

BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 1.2 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

ExtractionNumber tomograms: 55 / Number images used: 40000
Final angle assignmentType: NOT APPLICABLE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 7.0 Å / Resolution method: FSC 0.143 CUT-OFF / Number subtomograms used: 32857

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