Journal
EXPERIMENTAL PARASITOLOGY
Volume 125, Issue 4, Pages 329-337Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.exppara.2010.02.014
Keywords
Teladorsagia circumcincta; Activation-associated secreted proteins; IgA response; Vaccine development
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Funding
- Scottish Government Rural and Environment Research and Analysis Directorate (RERAD)
- BBSRC [BB/C51839X/1]
- Biotechnology and Biological Sciences Research Council [BB/C51839X/1] Funding Source: researchfish
- BBSRC [BB/C51839X/1] Funding Source: UKRI
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A detailed proteomic analysis of excreted/secretory (ES) proteins derived from fourth stage larvae (L4) of Teladorsagia circumcincta identified a number of components, including N-type and C-type single domain activation-associated secreted proteins (ASPs). Immunoblotting of L4 ES extracts with abomasal mucus derived from infected, immune sheep demonstrated the immunogenicity of some of these components, including an N-type single-domain ASP, designated Tci-ASP-1. The full-length cDNA encoding this protein was isolated and sequenced. Homology searches using the inferred amino acid sequence of Tci-ASP-1 showed that it had highest identity (75% over 231 residues) to, a N-type, single-domain ASP from Ostertagia ostertagi. Phylogenetic analysis confirmed the relationship of Tci-ASP-1 with other N-type ASPs. Reverse-transcriptase (RT)-PCR experiments demonstrated the presence of transcript encoding Tci-ASP-1 in L4 and adult stage T. circumcincta but not in pre-parasitic stages such as eggs and third stage larvae. A recombinant version of Tci-ASP-1 was expressed in Escherichia colt and the purified protein was reactive with IgA present in abomasal mucus derived from immune sheep. (C) 2010 Elsevier Inc. All rights reserved.
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