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Erschienen in: European Journal of Clinical Microbiology & Infectious Diseases 1/2010

01.01.2010 | Article

Streptococcal protective antigens (Spa): a new family of type-specific proteins of group A streptococci

verfasst von: E. A. Ahmed, T. A. Penfound, S. C. Brewer, P. A. Tennant, E. Y. Chiang, J. B. Dale

Erschienen in: European Journal of Clinical Microbiology & Infectious Diseases | Ausgabe 1/2010

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Abstract

Previous studies in our laboratory described a new group A streptococcal protective antigen (Spa) in type 18 streptococci that was distinct from the type 18 M protein. This study was undertaken to identify additional serotypes of group A streptococci that express Spa proteins. PCR techniques were used to identify and clone a new spa gene from type 36 streptococci. The 5′ sequence of spa36 was highly variable compared to spa18, while the 3′ sequence was conserved. Antisera against Spa36 opsonized type 36 streptococci but not type 18 streptococci, indicating that the opsonic Spa epitopes were type-specific. Antisera against the conserved carboxy-terminal half of Spa18 were used to identify Spa or Spa-like proteins expressed on the surface of 25 of 70 different serotypes of GAS. Spa proteins may represent a new family of type-specific surface antigens that function in concert with M proteins to elicit protective immune responses.
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Metadaten
Titel
Streptococcal protective antigens (Spa): a new family of type-specific proteins of group A streptococci
verfasst von
E. A. Ahmed
T. A. Penfound
S. C. Brewer
P. A. Tennant
E. Y. Chiang
J. B. Dale
Publikationsdatum
01.01.2010
Verlag
Springer-Verlag
Erschienen in
European Journal of Clinical Microbiology & Infectious Diseases / Ausgabe 1/2010
Print ISSN: 0934-9723
Elektronische ISSN: 1435-4373
DOI
https://doi.org/10.1007/s10096-009-0819-0

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