The present invention relates to a recombinant polypeptide capable of binding to IgE from subjects allergic to venom of an insect from the order Hymenoptera having a homology of more than 70% to the amino acid sequence of SEQ ID NO: 2, which is the honey bee allergen Api m3 (acid phosphatase). The invention further relates to nucleic acid encoding the polypeptide, expression vectors, host cells and methods of preparing the polypeptide, as well as diagnostic and pharmaceutical uses thereof.
