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dc.contributor.authorYan, Z
dc.contributor.authorYao, X
dc.contributor.authorPan, R
dc.contributor.authorZhang, J
dc.contributor.authorMa, X
dc.contributor.authorDong, N
dc.contributor.authorWei, J
dc.contributor.authorLiu, K
dc.contributor.authorQiu, Y
dc.contributor.authorSealey, K
dc.contributor.authorNichols, H
dc.contributor.authorJarvis, Michael A
dc.contributor.authorUpton, Mathew
dc.contributor.authorLi, X
dc.contributor.authorMa, Z
dc.contributor.authorLiu, J
dc.contributor.authorLi, B

Streptococcus suis is a significant pathogen in pigs and a newly emerging zoonotic agent in humans. The presence of multiple serotypes and strains with diversified sequence types in pig herds highlights the need for the identification of broadly cross-reactive universal vaccine antigen targets, capable of providing cross-protection against S. suis infection. Subunit vaccines based on the conserved proteins shared between different S. suis serotypes are potential candidates for such a universally protective vaccine. In the present study, phosphate ABC transporter ATP-binding protein PstB (PstB), an immunogenic protein of the S. suis bacterium, was expressed and purified, and then subjected to cross-protection evaluation in mice. The PstB protein showed nearly 100% amino acid similarity across a panel of 31 S. suis isolates representing different serotypes, which were collected from different countries. A recombinant PstB (rPstB) protein (S. suis serotype 2) was recognized by rabbit sera specific to this serotype, and induced high levels of IFN-γ and IL-4 in mice immunized with the recombinant protein. These cytokines are considered important for protection against S. suis infection. Immunization of mice with rPstB resulted in an 87.5% protection against challenge with S. suis serotype 2 and 9 strains, suggesting a high level of cross-protection for S. suis serotypes 2 and 9. A lower protection rate (62.5%) was observed in mice challenged with the S. suis serotype 7 strain. These data demonstrate that PstB is a promising target antigen for development as a component of a universal subunit vaccine against multiple S. suis serotypes.

dc.publisherMDPI AG
dc.titleSubunit Vaccine Targeting Phosphate ABC Transporter ATP-Binding Protein, PstB, Provides Cross-Protection against Streptococcus suis Serotype 2, 7, and 9 in Mice
plymouth.journalVeterinary Sciences
plymouth.organisational-group|Plymouth|Research Groups
plymouth.organisational-group|Plymouth|Faculty of Health
plymouth.organisational-group|Plymouth|Research Groups|Institute of Translational and Stratified Medicine (ITSMED)
plymouth.organisational-group|Plymouth|Research Groups|Institute of Translational and Stratified Medicine (ITSMED)|CBR
plymouth.organisational-group|Plymouth|REF 2021 Researchers by UoA
plymouth.organisational-group|Plymouth|Users by role
plymouth.organisational-group|Plymouth|Users by role|Academics
plymouth.organisational-group|Plymouth|REF 2021 Researchers by UoA|UoA01 Clinical Medicine
plymouth.organisational-group|Plymouth|Faculty of Health|School of Biomedical Sciences
plymouth.organisational-group|Plymouth|Users by role|Researchers in ResearchFish submission
plymouth.organisational-group|Plymouth|Research Groups|Plymouth Institute of Health and Care Research (PIHR)

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