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TitleStructural basis for neutralization of hepatitis A virus informs a rational design of highly potent inhibitors.
Journal, issue, pagesPLoS Biol, Vol. 17, Issue 4, Page e3000229, Year 2019
Publish dateApr 30, 2019
AuthorsLei Cao / Pi Liu / Pan Yang / Qiang Gao / Hong Li / Yao Sun / Ling Zhu / Jianping Lin / Dan Su / Zihe Rao / Xiangxi Wang /
PubMed AbstractHepatitis A virus (HAV), an enigmatic and ancient pathogen, is a major causative agent of acute viral hepatitis worldwide. Although there are effective vaccines, antivirals against HAV infection are ...Hepatitis A virus (HAV), an enigmatic and ancient pathogen, is a major causative agent of acute viral hepatitis worldwide. Although there are effective vaccines, antivirals against HAV infection are still required, especially during fulminant hepatitis outbreaks. A more in-depth understanding of the antigenic characteristics of HAV and the mechanisms of neutralization could aid in the development of rationally designed antiviral drugs targeting HAV. In this paper, 4 new antibodies-F4, F6, F7, and F9-are reported that potently neutralize HAV at 50% neutralizing concentration values (neut50) ranging from 0.1 nM to 0.85 nM. High-resolution cryo-electron microscopy (cryo-EM) structures of HAV bound to F4, F6, F7, and F9, together with results of our previous studies on R10 fragment of antigen binding (Fab)-HAV complex, shed light on the locations and nature of the epitopes recognized by the 5 neutralizing monoclonal antibodies (NAbs). All the epitopes locate within the same patch and are highly conserved. The key structure-activity correlates based on the antigenic sites have been established. Based on the structural data of the single conserved antigenic site and key structure-activity correlates, one promising drug candidate named golvatinib was identified by in silico docking studies. Cell-based antiviral assays confirmed that golvatinib is capable of blocking HAV infection effectively with a 50% inhibitory concentration (IC50) of approximately 1 μM. These results suggest that the single conserved antigenic site from complete HAV capsid is a good antiviral target and that golvatinib could function as a lead compound for anti-HAV drug development.
External linksPLoS Biol / PubMed:31039149 / PubMed Central
MethodsEM (single particle)
Resolution3.05 - 3.9 Å
Structure data

9827

6jhq

EMDB-9827, PDB-6jhq:
The cryo-EM structure of HAV bound to a neutralizing antibody-F4
Method: EM (single particle) / Resolution: 3.9 Å

9828

6jhr

EMDB-9828, PDB-6jhr:
The cryo-EM structure of HAV bound to a neutralizing antibody-F6
Method: EM (single particle) / Resolution: 3.68 Å

9829

6jhs

EMDB-9829, PDB-6jhs:
The cryo-EM structure of HAV bound to a neutralizing antibody-F7
Method: EM (single particle) / Resolution: 3.05 Å

9830

6jht

EMDB-9830, PDB-6jht:
The cryo-EM structure of HAV bound to a neutralizing antibody-F9
Method: EM (single particle) / Resolution: 3.79 Å

Source
  • mus musculus (house mouse)
  • human hepatitis a virus hu/australia/hm175/1976
KeywordsVIRUS / Icosahedral symmetry / neutralizing antibody / HAV / complex

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