Veterinary Research Communications

, Volume 34, Issue 5, pp 413–421 | Cite as

Characterization of a new protective antigen of Streptococcus canis

  • Jiande Yang
  • Yanfei Liu
  • Jun Xu
  • Benqiang Li
Original Article


Streptococcus canis (S. canis), a lancefield group G streptococcus, is an opportunistic pathogen mainly found in dogs and cats. The study on pathogenesis and protective immune mechanism of S. canis is not clear. A new streptococcal protective antigen (SPA) was first identified from a genomic library of S. canis. SPA of S. canis (SPASc) contained a 1224-bp open reading frame which encoded a 407aa protein and a 34-aa signal sequence with a deduced molecular mass of 46.368 kDa. Protein analysis and BLAST result showed that SPASc was homologous to the SPA of Streptococcus. equi subsp. zooepidemicus, M protein Streptococcus. equi., and SPA of Streptococcus pyogenes. The protective response of SPASc antiserum was demonstrated by passive mouse protection. These studies suggested that SPASc might be an important component of vaccines to prevent S. canis infections.


Streptococcal protective antigen S. canis Characterization Passive protection 



The financial supports of Tianjin Natural Science Foundation (07JCYBJC16000) and the Project-sponsored by SRF for ROCS, SEM were gratefully acknowledged. We thank Dr. Wenzhi Xue of Intervet (Merrian, Kansas) and Dr. Minghao Sun of the Scripps Research Institute for proof reading the manuscript.

Supplementary material

11259_2010_9414_MOESM1_ESM.doc (69 kb)
Fig. 1 DNA sequnence and deduced amino acid of SPASc. The sequence contains complete open reading frame with 1,224 nucleotides and deduced 407 amino acids. Underlined sequence means signal sequence. The sequence has been submitted to GeneBank and has the accession no. ACM47242 (DOC 69 kb)


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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Department of Animal ScienceTianjin Agricultural UniversityTianjinChina

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