Outer membrane proteins (OMPs) are one of the prominent virulence factor or immunogenic element of Pasteurella multocida which are responsible for eliciting immune responses in multiple infected hosts. Identification of these proteins allows researchers to target OMPs to be manipulated as a vaccine against bacterial infection. Precise and rapid bioinformatics tools allow researchers to perform in silico analysis to extract putative OMPs from the genome information. In this study, we have successfully identified 105 putative OMPs of P. multocida subsp. multocida strain PMTB2.1 through computational prediction tools including a subcellular localisation predictor, PSORTb v3.0 followed by a lipoprotein predictor, LipoP 1.0 and a β-barrel transmembrane protein predictor, BOMP for sub-classification of the OMPs into 53 integral and 52 peripheral OMPs of this strain. The manipulation of antigenic epitope predictors and the antigenicity score filtering identified nine putative antigenic OMPs. These putative predicted antigenic OMPs of this pathogen will provide crucial initial guidance for the experimental identification and selection of antigenic protein(s) for the development of future haemorrhagic septicaemia (HS) vaccine.
Pasteurella multocida B:2 is an important veterinary pathogen causing fatal and acute haemorrhagic septicaemia (HS) in bovine. A live vaccine candidate, P. multocida B:2 GDH7 was reported to enable protection in cattle and buffaloes via intranasal (i. n.) administration. This potential vaccine was also reported to be self-transmitted from the vaccinated animal to the free-ranging animals allowing wider vaccination coverage. Prior to commercialisation, this potential vaccine requires further characterisation in accordance with the authoritative guidelines from the World Organisation for Animal Health (OIE). Hence, in this study, the potential vaccine strain, P. multocida B:2 GDH7 and the virulent parent strain were characterised through genomic and proteomic profiling. A crucial first step was to develop a sensitive yet simple and robust identification test to differentiate both strains which has been achieved by the development of a precise yet straightforward PCR method. In genomic profiling, Repetitive Extragenic Palindromic sequence-PCR (REP-PCR) was manipulated and both strains have a different display of genomic DNA band patterns. Some of the major OMPs were observed and prominent immunogens of P. multocida, OmpA and OmpH were observed to be expressed differently between these strains through SDS-PAGE analysis. In conclusion, a reproducible PCR detection method has enabled differentiation of both strains. Further characterisation of these strains shows a significantly different profile through genomic and proteomic profiling.
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