alexa Immunoproteomic assay of surface proteins of Streptococcus suis serotype 9.


Journal of Bacteriology & Parasitology

Author(s): Wu Z, Zhang W, Lu C

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Abstract Streptococcus suis is an important swine pathogen responsible for a diverse group of diseases. Studies on vaccines have focused on S. suis serotype 2 strains, which are the most invasive isolates worldwide. However, in China S. suis serotype 9 (SS9) is also a prevalent serotype, which is frequently isolated from diseased pigs. Little is known about immunogenic proteins for SS9. Therefore, an immunoproteomic-based approach was developed to identify immunogenic proteins of SS9. Cell wall proteins extracted from SS9 strain GZ0565 isolated from a diseased pig with meningitis were screened by two-dimensional Western blotting using anti-SS9 sera pooled from specific pathogen-free mice. Protein spots were excised from preparative gels and identified by matrix-assisted laser desorption ionization time-of-flight MS (MALDI-TOF-MS) or MALDI-TOF-TOF-MS, which led to the identification of eight immunogenic proteins (arginine deiminase, extracellular solute-binding protein, translation elongation factor Ts, neprilysin, peptide ATP-binding cassette transporter peptide-binding protein, pyruvate kinase, phosphate acetyltransferase, and fructose-bisphosphate aldolase). These immunogenic proteins, which are encoded by genes that are reasonably conserved among SS9 strains, could be developed as vaccine candidates. This article was published in FEMS Immunol Med Microbiol and referenced in Journal of Bacteriology & Parasitology

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