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Int Arch Allergy Immunol. 2005 Aug;137(4):273-81. Epub 2005 Jun 17.

Lipid transfer proteins from fruit: cloning, expression and quantification.

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  • 1Department of Immunopathology, Sanquin, Amsterdam, The Netherlands.

Erratum in

  • Int Arch Allergy Immunol. 2006;140(4):341. Rivas, Montserrat Fernandez [corrected to Fernandez Rivas, Montserrat]; Mancebo, Eloina Gonzalez [corrected to Gonzalez Mancebo, Eloina].



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.


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.


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.


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.

Copyright 2005 S. Karger AG, Basel.

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