Abstract:
BACKGROUND:Several studies showed that calcium-binding proteins have a fixed place in the spectrum of allergenic substances. Often the binding of a calcium ion induces conformational changes and affects immunoglobulin E-binding to the allergen. Hence, the quantitative characterization of the binding to calcium is of importance to understand both the biologic and allergenic activity of these proteins. AIMS OF THE STUDY:In the present study we describe a procedure for determining the stoichiometry and dissociation constant (K(D)) of calcium-binding allergens using circular dichroism (CD) techniques. For the experiments, we used recombinant Bet v 4, a two EF-hand allergen from birch pollen. METHODS:Solutions of Bet v 4 were titrated with calcium and the change in molar ellipticity at 222 nm was monitored with a CD spectropolarimeter. RESULTS:The determination of the binding stoichiometry as well as of the K(D) for one EF-hand (4 microM) demonstrated the applicability of the method. CONCLUSIONS:CD-monitored calcium-titration of protein solutions represents a fast and easy method for determining the binding characteristics of calcium-binding allergens.
journal_name
Allergyjournal_title
Allergyauthors
Hebenstreit D,Ferreira Fdoi
10.1111/j.1398-9995.2005.00907.xkeywords:
subject
Has Abstractpub_date
2005-09-01 00:00:00pages
1208-11issue
9eissn
0105-4538issn
1398-9995pii
ALL907journal_volume
60pub_type
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