Lipid Transfer Proteins from Fruit: Cloning, Expression and QuantificationZuidmeer L.a · van Leeuwen W.A.a · Kleine Budde I.a · Cornelissen J.a · Bulder I.a · Rafalska I.a · Telléz Besolí N.a · Akkerdaas J.H.a · Asero R.b · Fernandez Rivas M.c · Gonzalez Mancebo E.c · van Ree R.a
aDepartment of Immunopathology, Sanquin, Amsterdam, The Netherlands; bAmbulatorio di Allergologia, Ospedale Caduti Bollatesi, Bollate (MI), Italy; cAllergy Unit, Fundación Hospital Alcorcón, Madrid, Spain
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Background: Lipid transfer proteins (LTP) are stable, potentially life-threatening allergens in fruits and many other vegetable foods. The aim of this study was to clone and express recombinant apple LTP (Mal d 3), as has previously been done for peach LTP (Pru p 3) and set up quantitative tests for measuring fruit LTPs. Methods: cDNA for Mal d 3 and Pru p 3 was cloned, expressed in the yeast Pichia pastoris and the resulting proteins were purified via cation exchange chromatography. The immune reactivity of rMal d 3 was compared to nMal d 3 by RAST (inhibition), immunoblotting and basophil histamine release testing. To obtain monoclonal and monospecific polyclonal antibodies, mice and rabbits were immunized with purified nMal d 3. Results: The deduced amino acid sequence of Mal d 3 was identical to the published sequence, Pru p 3 differed at two positions (S9A and S76H). The rMal d 3 had an IgE-binding potency and biological activity close to its natural counterpart. One sandwich ELISA selectively detecting apple LTP and another cross-reactive with cherry, nectarine and hazelnut LTP were developed. In addition, a competitive RIA was developed with polyclonal rabbit antiserum and labeled nMal d 3. Conclusion: rMal d 3 (as shown before for rPru p 3) may be a useful tool for application in component-resolved diagnosis of food allergy. Assays for the measurement of LTP will increase the traceability of this potentially dangerous allergen.
© 2005 S. Karger AG, Basel
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