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- EMDB-8629: Conformational states of a soluble, uncleaved HIV-1 envelope trimer -

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Basic information

Entry
Database: EMDB / ID: 8629
TitleConformational states of a soluble, uncleaved HIV-1 envelope trimer
Map dataclass1 (close conformation)
SampleHIV-1 envelope glycoprotein gp140:
Function / homologyGp120 core superfamily / Envelope glycoprotein Gp160 / Human immunodeficiency virus 1, envelope glycoprotein Gp120 / Retroviral envelope protein GP41-like / Envelope glycoprotein GP120 / Retroviral envelope protein / positive regulation of plasma membrane raft polarization / positive regulation of establishment of T cell polarity / positive regulation of receptor clustering / actin filament reorganization ...Gp120 core superfamily / Envelope glycoprotein Gp160 / Human immunodeficiency virus 1, envelope glycoprotein Gp120 / Retroviral envelope protein GP41-like / Envelope glycoprotein GP120 / Retroviral envelope protein / positive regulation of plasma membrane raft polarization / positive regulation of establishment of T cell polarity / positive regulation of receptor clustering / actin filament reorganization / host cell endosome membrane / evasion or tolerance by virus of host immune response / viral protein processing / fusion of virus membrane with host plasma membrane / clathrin-dependent endocytosis of virus by host cell / fusion of virus membrane with host endosome membrane / viral envelope / virion attachment to host cell / host cell plasma membrane / virion membrane / structural molecule activity / integral component of membrane / identical protein binding / Envelope glycoprotein gp160
Function and homology information
SourceHuman immunodeficiency virus 1
Methodsingle particle reconstruction / cryo EM / 21 Å resolution
AuthorsLiu YH / Pan JH / Cai YF / Grigorieff N / Harrison SC / Chen B
CitationJournal: J. Virol. / Year: 2017
Title: Conformational States of a Soluble, Uncleaved HIV-1 Envelope Trimer.
Authors: Yuhang Liu / Junhua Pan / Yongfei Cai / Nikolaus Grigorieff / Stephen C Harrison / Bing Chen
Abstract: The HIV-1 envelope spike [Env; trimeric (gp160) cleaved to (gp120/gp41)] induces membrane fusion, leading to viral entry. It is also the viral component targeted by neutralizing antibodies. Vaccine ...The HIV-1 envelope spike [Env; trimeric (gp160) cleaved to (gp120/gp41)] induces membrane fusion, leading to viral entry. It is also the viral component targeted by neutralizing antibodies. Vaccine development requires production, in quantities suitable for clinical studies, of a recombinant form that resembles functional Env. HIV-1 gp140 trimers-the uncleaved ectodomains of (gp160)-from a few selected viral isolates adopt a compact conformation with many antigenic properties of native Env spikes. One is currently being evaluated in a clinical trial. We report here low-resolution (20 Å) electron cryomicroscopy (cryoEM) structures of this gp140 trimer, which adopts two principal conformations, one closed and the other slightly open. The former is indistinguishable at this resolution from those adopted by a stabilized, cleaved trimer (SOSIP) or by a membrane-bound Env trimer with a truncated cytoplasmic tail (EnvΔCT). The latter conformation is closer to a partially open Env trimer than to the fully open conformation induced by CD4. These results show that a stable, uncleaved HIV-1 gp140 trimer has a compact structure close to that of native Env. Development of any HIV vaccine with a protein component (for either priming or boosting) requires production of a recombinant form to mimic the trimeric, functional HIV-1 envelope spike in quantities suitable for clinical studies. Our understanding of the envelope structure has depended in part on a cleaved, soluble trimer, known as SOSIP.664, stabilized by several modifications, including an engineered disulfide. This construct, which is difficult to produce in large quantities, has yet to induce better antibody responses than those to other envelope-based immunogens, even in animal models. The uncleaved ectodomain of the envelope protein, called gp140, has also been made as a soluble form to mimic the native Env present on the virion surface. Most HIV-1 gp140 preparations are not stable, however, and have an inhomogeneous conformation. The results presented here show that gp140 preparations from suitable isolates can adopt a compact, native-like structure, supporting its use as a vaccine candidate.
DateDeposition: Feb 28, 2017 / Header (metadata) release: Mar 8, 2017 / Map release: Mar 8, 2017 / Last update: Jul 18, 2018

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.3
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.3
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

Downloads & links

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Map

Fileemd_8629.map.gz (map file in CCP4 format, 23329 KB)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
180 pix
3.96 Å/pix.
= 712.8 Å
180 pix
3.96 Å/pix.
= 712.8 Å
180 pix
3.96 Å/pix.
= 712.8 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 3.96 Å
Density
Contour Level:0.3 (by author), 0.3 (movie #1):
Minimum - Maximum-0.13682505 - 1.8125496
Average (Standard dev.)-0.016044373 (0.034623753)
Details

EMDB XML:

Space Group Number1
Map Geometry
Axis orderXYZ
Dimensions180180180
Origin0.0.0.
Limit179.179.179.
Spacing180180180
CellA=B=C: 712.8 Å
α=β=γ: 90.0 deg.

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z3.963.963.96
M x/y/z180180180
origin x/y/z0.0000.0000.000
length x/y/z712.800712.800712.800
α/β/γ90.00090.00090.000
start NX/NY/NZ-152-37
NX/NY/NZ998271
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS180180180
D min/max/mean-0.1371.813-0.016

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Supplemental data

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Sample components

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Entire HIV-1 envelope glycoprotein gp140

EntireName: HIV-1 envelope glycoprotein gp140 / Number of components: 2

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Component #1: protein, HIV-1 envelope glycoprotein gp140

ProteinName: HIV-1 envelope glycoprotein gp140 / Recombinant expression: No
SourceSpecies: Human immunodeficiency virus 1 / Strain: C97ZA012
Source (engineered)Expression System: Homo sapiens (human) / Cell of expression system: HEK 293T

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Component #2: protein, HIV-1 envelope glycoprotein gp140

ProteinName: HIV-1 envelope glycoprotein gp140 / Recombinant expression: No
SourceSpecies: Human immunodeficiency virus 1
Source (engineered)Expression System: Homo sapiens (human)

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Experimental details

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Sample preparation

SpecimenSpecimen state: particle / Method: cryo EM
Sample solutionpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Tecnai Polara / Image courtesy: FEI Company
ImagingMicroscope: FEI POLARA 300
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Electron dose: 4 e/Å2 / Illumination mode: FLOOD BEAM
LensCs: 2 mm / Imaging mode: BRIGHT FIELD
Specimen HolderModel: OTHER
CameraDetector: GATAN K2 SUMMIT (4k x 4k)

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Image acquisition

Image acquisitionNumber of digital images: 3138 / Sampling size: 5 microns / Details: movies were collected in super resolution mode

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Image processing

ProcessingMethod: single particle reconstruction / Applied symmetry: C3 (3 fold cyclic) / Number of projections: 17000
3D reconstructionAlgorithm: FOURIER SPACE / Resolution: 21 Å / Resolution method: FSC 0.143 CUT-OFF
FSC plot
(resolution estimation)

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