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TitleAntibody affinity versus dengue morphology influences neutralization.
Journal, issue, pagesPLoS Pathog, Vol. 17, Issue 2, Page e1009331, Year 2021
Publish dateFeb 23, 2021
AuthorsGuntur Fibriansah / Elisa X Y Lim / Jan K Marzinek / Thiam-Seng Ng / Joanne L Tan / Roland G Huber / Xin-Ni Lim / Valerie S Y Chew / Victor A Kostyuchenko / Jian Shi / Ganesh S Anand / Peter J Bond / James E Crowe / Shee-Mei Lok /
PubMed AbstractDifferent strains within a dengue serotype (DENV1-4) can have smooth, or "bumpy" surface morphologies with different antigenic characteristics at average body temperature (37°C). We determined the ...Different strains within a dengue serotype (DENV1-4) can have smooth, or "bumpy" surface morphologies with different antigenic characteristics at average body temperature (37°C). We determined the neutralizing properties of a serotype cross-reactive human monoclonal antibody (HMAb) 1C19 for strains with differing morphologies within the DENV1 and DENV2 serotypes. We mapped the 1C19 epitope to E protein domain II by hydrogen deuterium exchange mass spectrometry, cryoEM and molecular dynamics simulations, revealing that this epitope is likely partially hidden on the virus surface. We showed the antibody has high affinity for binding to recombinant DENV1 E proteins compared to those of DENV2, consistent with its strong neutralizing activities for all DENV1 strains tested regardless of their morphologies. This finding suggests that the antibody could out-compete E-to-E interaction for binding to its epitope. In contrast, for DENV2, HMAb 1C19 can only neutralize when the epitope becomes exposed on the bumpy-surfaced particle. Although HMAb 1C19 is not a suitable therapeutic candidate, this study with HMAb 1C19 shows the importance of choosing a high-affinity antibody that could neutralize diverse dengue virus morphologies for therapeutic purposes.
External linksPLoS Pathog / PubMed:33621239 / PubMed Central
MethodsEM (single particle)
Resolution19.0 - 23.0 Å
Structure data

30883

7dwt

EMDB-30883, PDB-7dwt:
Cryo-EM structure of Dengue virus serotype 1 strain WestPac 74 in complex with human antibody 1C19 Fab at 37 deg C (Class 1 particle)
Method: EM (single particle) / Resolution: 19.0 Å

30884

7dwu

EMDB-30884, PDB-7dwu:
Cryo-EM structure of Dengue virus serotype 1 strain WestPac 74 in complex with human antibody 1C19 Fab at 37 deg C (Class 2 particle)
Method: EM (single particle) / Resolution: 19.0 Å

EMDB-30885:
Cryo-EM map of Dengue virus serotype 2 strain PVP94/07 in complex with human antibody 1C19 Fab at 37 deg C
Method: EM (single particle) / Resolution: 23.0 Å

EMDB-30886:
Cryo-EM map of Dengue virus serotype 2 strain PVP94/07 in complex with human antibody 1C19 Fab at 40 deg C
Method: EM (single particle) / Resolution: 23.0 Å

Source
  • dengue virus 1
  • homo sapiens (human)
  • Dengue virus 2
KeywordsVIRUS/IMMUNE SYSTEM / dengue virus / human antibody / dengue-Fab structure / VIRUS / VIRUS-IMMUNE SYSTEM complex

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