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- EMDB-6118: Electron cryo-microscopy of human papillomavirus 16 and H16.V5 Fa... -

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Database: EMDB / ID: 6118
TitleElectron cryo-microscopy of human papillomavirus 16 and H16.V5 Fab fragments
Map dataReconstruction of mature human papillomavirus 16 capsid complexed with Fab fragments after 72 hr incubation
SampleMature HPV16 quasivirus capsid complexed with H16.V5 Fabs:
virus / H16.V5 Fab
Keywordsvirus-Fab complex / neutralization antibody / maturation
SourceHuman papillomavirus 16 / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / 15.8 Å resolution
AuthorsLee H / Brendle SA / Bywaters SM / Guan J / Ashley RE / Yoder JD / Makhov AM / Conway JF / Christensen ND / Hafenstein S
CitationJournal: J. Virol. / Year: 2015
Title: A cryo-electron microscopy study identifies the complete H16.V5 epitope and reveals global conformational changes initiated by binding of the neutralizing antibody fragment.
Authors: Hyunwook Lee / Sarah A Brendle / Stephanie M Bywaters / Jian Guan / Robert E Ashley / Joshua D Yoder / Alexander M Makhov / James F Conway / Neil D Christensen / Susan Hafenstein
Abstract: Human papillomavirus 16 (HPV16) is a worldwide health threat and an etiologic agent of cervical cancer. To understand the antigenic properties of HPV16, we pursued a structural study to elucidate HPV ...Human papillomavirus 16 (HPV16) is a worldwide health threat and an etiologic agent of cervical cancer. To understand the antigenic properties of HPV16, we pursued a structural study to elucidate HPV capsids and antibody interactions. The cryo-electron microscopy (cryo-EM) structures of a mature HPV16 particle and an altered capsid particle were solved individually and as complexes with fragment of antibody (Fab) from the neutralizing antibody H16.V5. Fitted crystal structures provided a pseudoatomic model of the virus-Fab complex, which identified a precise footprint of H16.V5, including previously unrecognized residues. The altered-capsid-Fab complex map showed that binding of the Fab induced significant conformational changes that were not seen in the altered-capsid structure alone. These changes included more ordered surface loops, consolidated so-called "invading-arm" structures, and tighter intercapsomeric connections at the capsid floor. The H16.V5 Fab preferentially bound hexavalent capsomers likely with a stabilizing effect that directly correlated with the number of bound Fabs. Additional cryo-EM reconstructions of the virus-Fab complex for different incubation times and structural analysis provide a model for a hyperstabilization of the capsomer by H16.V5 Fab and showed that the Fab distinguishes subtle differences between antigenic sites.
Importance: Our analysis of the cryo-EM reconstructions of the HPV16 capsids and virus-Fab complexes has identified the entire HPV.V5 conformational epitope and demonstrated a detailed neutralization mechanism of this clinically important monoclonal antibody against HPV16. The Fab bound and ordered the apical loops of HPV16. This conformational change was transmitted to the lower region of the capsomer, resulting in enhanced intercapsomeric interactions evidenced by the more ordered capsid floor and "invading-arm" structures. This study advances the understanding of the neutralization mechanism used by H16.V5.
DateDeposition: Sep 30, 2014 / Header (metadata) release: Oct 8, 2014 / Map release: Dec 3, 2014 / Last update: May 27, 2015

Structure visualization

  • Surface view with section colored by density value
  • Surface level: 1
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 1
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Structure viewerEM map:
Supplemental images

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Fileemd_6118.map.gz (map file in CCP4 format, 117502 KB)
Projections & slices

Image control

AxesZ (Sec.)Y (Row.)X (Col.)
311 pix
2.86 Å/pix.
= 889.46 Å
311 pix
2.86 Å/pix.
= 889.46 Å
311 pix
2.86 Å/pix.
= 889.46 Å



Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 2.86 Å
Contour Level:1.0 (by author), 1 (movie #1):
Minimum - Maximum-5.65556288 - 5.93166399
Average (Standard dev.)0E-8 (0.99999994)


Space Group Number1
Map Geometry
Axis orderXYZ
CellA=B=C: 889.45996 Å
α=β=γ: 90.0 deg.

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z2.862.862.86
M x/y/z311311311
origin x/y/z0.0000.0000.000
length x/y/z889.460889.460889.460
start NX/NY/NZ
MAP C/R/S123
start NC/NR/NS-155-155-155
D min/max/mean-5.6565.9320.000

Supplemental data

Sample components

Entire Mature HPV16 quasivirus capsid complexed with H16.V5 Fabs

EntireName: Mature HPV16 quasivirus capsid complexed with H16.V5 Fabs
Number of components: 2
Oligomeric State: Three hundred H16.V5 Fabs bind to one HPV16 capsid
MassTheoretical: 42 MDa

Component #1: virus, Human papillomavirus 16

VirusName: Human papillomavirus 16Papillomaviridae / Class: VIRION
Details: The virus sample was incubated with excessive Fab fragments for 72 hrs.
Enveloped: No / Empty: No / Isolate: OTHER
MassTheoretical: 27 MDa
SpeciesSpecies: Human papillomavirus 16
Source (natural)Host Species: Homo sapiens (human) / Host category: VERTEBRATES
Shell #1Name of element: L1/L2 / Diameter: 600 Å / T number(triangulation number): 7

Component #2: protein, H16.V5 Fab

ProteinName: H16.V5 Fab / Oligomeric Details: monomer / Recombinant expression: No / Number of Copies: 300
MassTheoretical: 50 kDa
SourceSpecies: Mus musculus (house mouse)
Source (natural)Cell: hybridoma

Experimental details

Sample preparation

SpecimenSpecimen state: particle / Method: cryo EM
Sample solutionSpecimen conc.: 1 mg/ml
Buffer solution: 137 mM NaCl, 2.7 mM KCl, 10 mM Na2HPO4, 1.8 mM KH2PO4
pH: 7.4
Support filmglow-discharged holey carbon Quantifoil grids
VitrificationInstrument: GATAN CRYOPLUNGE 3 / Cryogen name: ETHANE / Temperature: 102 K / Humidity: 90 % / Method: Blot for 0.7 seconds before plunging.

Electron microscopy imaging

ImagingMicroscope: JEOL 2100 / Date: Aug 18, 2014
Electron gunElectron source: LAB6 / Accelerating voltage: 200 kV / Electron dose: 15 e/Å2 / Illumination mode: SPOT SCAN
LensMagnification: 40000 X (nominal) / Cs: 2 mm / Imaging mode: BRIGHT FIELD / Defocus: 1630 - 5180 nm
Specimen HolderModel: GATAN LIQUID NITROGEN / Temperature: 95 K
CameraDetector: GATAN ULTRASCAN 4000 (4k x 4k)

Image acquisition

Image acquisitionNumber of digital images: 102

Image processing

ProcessingMethod: single particle reconstruction / Applied symmetry: I (icosahedral) / Number of projections: 2075
Details: The particles were selected using semi-automatic program e2boxer.py (EMAN2).
3D reconstructionAlgorithm: Cross-common lines / Software: Auto3dem / CTF correction: Each particle
Details: Semi-automatic particle selection was performed using e2boxer.py to obtain the particle coordinates, followed by particle boxing, linearization, normalization, and apodization of the images using Robem. Defocus and astigmatism values to perform contrast transfer function (CTF) correction were assessed using Robem for the extracted particles. The icosahedrally averaged reconstructions were initiated using a random model generated with setup_rmc and reached 14 A resolution estimated at a Fourier Shell Correlation (FSC) of 0.5. For the last step of refinement, the final maps were CTF-corrected using a B factor of 200 A2.
Resolution: 15.8 Å / Resolution method: FSC 0.5, semi-independent

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