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Research Article

Molecular studies of Ssa1, a serotype-specific antigen of Pasteurella haemolytica A1.

R Y Lo, C A Strathdee, P E Shewen, B J Cooney
R Y Lo
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C A Strathdee
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P E Shewen
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B J Cooney
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ABSTRACT

A serotype-specific antigen of Pasteurella haemolytica A1 encoded on the recombinant plasmid pSSA1 is characterized. Nucleotide sequence analysis of the insert DNA in pSSA1 identified the gene ssaI, which codes for a protein of approximately 100 kDa. In vivo labeling of pSSA1-encoded protein in Escherichia coli maxicells showed the expression of a 100-kDa protein from the insert DNA on the recombinant plasmid. Northern blot and primer extension analyses were used to identify the mRNA transcript in P. haemolytica A1 and the putative promoter of ssaI. The antigen (designated Ssa1) could be localized to the outer membrane of P. haemolytica A1 and E. coli clones carrying pSSA1. A rabbit serum against Ssa1 was produced by using whole cells of E. coli expressing Ssa1 on the surface as the immunogen, demonstrating that Ssa1 is immunogenic in rabbits. The results from colony immunoblot analysis with calf serum from animals that were resistant to P. haemolytica A1-induced pneumonia suggest indirectly that Ssa1 is also immunogenic in the animals.

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Molecular studies of Ssa1, a serotype-specific antigen of Pasteurella haemolytica A1.
R Y Lo, C A Strathdee, P E Shewen, B J Cooney
Infection and Immunity Oct 1991, 59 (10) 3398-3406; DOI:

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Molecular studies of Ssa1, a serotype-specific antigen of Pasteurella haemolytica A1.
R Y Lo, C A Strathdee, P E Shewen, B J Cooney
Infection and Immunity Oct 1991, 59 (10) 3398-3406; DOI:
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