# Design of a Multi-Epitope Vaccine Against Ovine Pasteurella multocida Using Immunoinformatics Strategies

## TL;DR

Scientists designed a multi-epitope vaccine against a sheep pathogen using computational methods and tested its potential for immune response.

## Contribution

A novel multi-epitope vaccine construct with adjuvant sequences was designed and computationally validated for Pm.

## Key findings

- A vaccine construct with favorable physicochemical properties and structural stability was developed.
- Molecular docking showed potential binding to TLR2/TLR4 with a binding energy of −10.1 kcal/mol for TLR4.
- Immune simulations predicted strong B-cell, T-cell, and cytokine responses from the vaccine.

## Abstract

This study aimed to design a multi-epitope vaccine (MEV) against Pasteurella multocida (Pm) using immunoinformatics approaches. Based on four conserved outer membrane proteins (OmpA; OmpH; PlpEand LolA), 15 immunodominant epitopes were identified, including 8 CTL epitopes, 3 HTL epitopes, and 4 B-cell epitopes. A vaccine construct was developed by incorporating RGD and PADRE adjuvant sequences. Computational analyses indicated that the vaccine possesses favorable physicochemical properties and structural stability. The molecular docking and normal mode analyses reveal a potential binding interface between the basis and TLR2/TLR4, with a computed binding energy of −10.1 kcal/mol for TLR4, suggesting a possible preferential interaction. Immune simulation predicted the vaccine could effectively elicit responses from B cells, T cells, and key cytokines such as IFN-γ. Additionally, the vaccine sequence was successfully cloned into the pET-28a (+) expression vector, facilitating future recombinant expression. This study provides a theoretical foundation for developing a safe and effective subunit vaccine against Pm.