Pooled protein immunization for identification of cell surface antigens in Streptococcus sanguinis

Xiuchun Ge, Todd Kitten, Cindy Munro, Daniel H. Conrad, Ping Xu

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Background: Available bacterial genomes provide opportunities for screening vaccines by reverse vaccinology. Efficient identification of surface antigens is required to reduce time and animal cost in this technology. We developed an approach to identify surface antigens rapidly in Streptococcus sanguinis, a common infective endocarditis causative species. Methods and Findings: We applied bioinformatics for antigen prediction and pooled antigens for immunization. Fortyseven surface-exposed proteins including 28 lipoproteins and 19 cell wall-anchored proteins were chosen based on computer algorithms and comparative genomic analyses. Eight proteins among these candidates and 2 other proteins were pooled together to immunize rabbits. The antiserum reacted strongly with each protein and with S. sanguinis whole cells. Affinity chromatography was used to purify the antibodies to 9 of the antigen pool components. Competitive ELISA and FACS results indicated that these 9 proteins were exposed on S. sanguinis cell surfaces. The purified antibodies had demonstrable opsonic activity. Conclusions: The results indicate that immunization with pooled proteins, in combination with affinity purification, and comprehensive immunological assays may facilitate cell surface antigen identification to combat infectious diseases.

Original languageEnglish (US)
Article numbere11666
JournalPLoS One
Volume5
Issue number7
DOIs
StatePublished - Aug 20 2010
Externally publishedYes

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Streptococcus sanguinis
Immunization
surface antigens
Surface Antigens
Streptococcus
immunization
Proteins
Antigens
proteins
antigens
Bacterial Genomes
Antibodies
Protein S
Endocarditis
Computational Biology
Affinity Chromatography
Affinity chromatography
Cell Wall
Lipoproteins
endocarditis

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Cite this

Pooled protein immunization for identification of cell surface antigens in Streptococcus sanguinis. / Ge, Xiuchun; Kitten, Todd; Munro, Cindy; Conrad, Daniel H.; Xu, Ping.

In: PLoS One, Vol. 5, No. 7, e11666, 20.08.2010.

Research output: Contribution to journalArticle

Ge, Xiuchun ; Kitten, Todd ; Munro, Cindy ; Conrad, Daniel H. ; Xu, Ping. / Pooled protein immunization for identification of cell surface antigens in Streptococcus sanguinis. In: PLoS One. 2010 ; Vol. 5, No. 7.
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