Abstract:
BACKGROUND:The house dust mite (HDM) Dermatophagoides pteronyssinus is a major allergen source eliciting allergic asthma. The aim of the study was to identify new important HDM allergens associated with allergic asthma. METHODS:A cDNA coding for a new mite allergen, designated Der p 21, was isolated using immunoglobulin E (IgE) antibodies from patients with allergic asthma out of a D. pteronyssinus expression cDNA library and expressed in Escherichia coli. RESULTS:Circular dichroism analysis of the purified allergen showed that rDer p 21 (14 726 Da) is one of the few mite allergens with an alpha-helical secondary structure. The protein exhibited high thermal stability and refolding capacity, and, as determined by small angle X-ray scattering, formed a dimer consisting of two flat triangles. rDer p 21 bound high levels of patients' IgE antibodies and showed high allergenic activity in basophil activation experiments. Rabbit anti-Der p 21 IgG antibodies inhibited mite-allergic patients' IgE binding and allowed the ultrastructural localization of the allergen in the midgut (epithelium, lumen and faeces) of D. pteronyssinus by immunogold electron microscopy. Der p 21 revealed sequence homology with group 5 mite allergens, but IgE and IgG reactivity data and cross-inhibition studies identified it as a new mite allergen. CONCLUSIONS:Der p 21 is a new important mite allergen which is liberated into the environment via faecal particles and hence may be associated with allergic asthma.
journal_name
Allergyjournal_title
Allergyauthors
Weghofer M,Dall'Antonia Y,Grote M,Stöcklinger A,Kneidinger M,Balic N,Krauth MT,Fernández-Caldas E,Thomas WR,van Hage M,Vieths S,Spitzauer S,Horak F,Svergun DI,Konarev PV,Valent P,Thalhamer J,Keller W,Valenta R,Vrtaldoi
10.1111/j.1398-9995.2008.01647.xsubject
Has Abstractpub_date
2008-06-01 00:00:00pages
758-67issue
6eissn
0105-4538issn
1398-9995pii
ALL1647journal_volume
63pub_type
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