Abstract:
:ABA-1 is a major allergen of nematode parasites of the genus Ascaris which includes the large roundworms of humans and pigs, A. lumbricoides and A. suum, respectively. The allergen was purified from A. suum by immunoaffinity chromatography for immunochemical examination. The IgE antibody repertoire is under MHC control in infected rodents and the IgE-binding epitopes were robust to treatment with heat or periodate, and electroblotting on nitrocellulose. This implies that the IgE epitopes comprise primary peptide sequence or an unusually stable secondary or tertiary structure. The molecular mass of ABA-1 is controversial, but mass spectrometry analysis indicated that there were five components of similar size, with the major species being 14,643.2 +/- 1.4 D. Finally, N-terminal sequence analysis of ABA-1 and TBA-1 (the homologue in the canine nematode infective to humans, Toxocara canis) revealed a high degree of similarity, and we have previous evidence that ABA-1 homologues are widespread amongst ascaridid parasites of humans. ABA-1 and its homologues might, therefore, be important to the immunopathology of many infections with nematode parasites, upon which the genetic constitution of the hosts will also have a bearing.
journal_name
Clin Exp Immunoljournal_title
Clinical and experimental immunologyauthors
Christie JF,Dunbar B,Kennedy MWdoi
10.1111/j.1365-2249.1993.tb05958.xsubject
Has Abstractpub_date
1993-04-01 00:00:00pages
125-32issue
1eissn
0009-9104issn
1365-2249journal_volume
92pub_type
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