ZIKV Envelope Domain-Specific Antibodies: Production, Purification and Characterization

Area of Science:

• Virology
• Immunology
• Vaccinology

Background:

• Zika virus (ZIKV) infection gained public attention due to its association with congenital microcephaly.
• Accurate ZIKV diagnosis is challenging due to cross-reactivity with other Flaviviruses.
• Understanding ZIKV immunogenicity and antibody responses is critical for developing reliable detection methods for protective antibodies.

Purpose of the Study:

• To produce, purify, and characterize polyclonal antibodies against the ZIKV envelope (E) protein.
• To investigate the neutralizing and non-neutralizing epitopes of ZIKV.
• To provide data for ZIKV vaccine design and the development of robust diagnostic assays.

Main Methods:

• Production, purification, and characterization of six polyclonal antibodies against ZIKV E protein.
• Binding assays using isolated ZIKV E protein and ZIKV particles.
• Surface plasmon resonance for affinity measurements.
• Epitope mapping to identify binding sites.

Main Results:

• The produced antibodies bind to ZIKV E protein and ZIKV particles with high affinity.
• The antibodies exhibit weak or non-neutralizing activity.
• Epitope mapping identified seven binding sites on the ZIKV E protein, partially overlapping with known neutralizing epitopes.
• No significant cross-reactivity or neutralization was observed against West Nile virus.

Conclusions:

• The study extends the understanding of neutralizing and non-/weak-neutralizing epitopes on the ZIKV E protein.
• The characterized antibodies provide a basis for designing improved ZIKV vaccines.
• The findings support the development of more specific and robust diagnostic assays for ZIKV protective antibodies.