Cloning and expression of the major allergen from yellow mustard seeds, Sin a I

Abstract

The cloning and bacterial expression of the major allergen from yellow mustard (Sin a I) is reported. Cloning has been carried out by means of the polymerase chain reaction using non-degenerate oligo primers encoding the N- and C-terminal regions of the mature protein. Two nucleotide sequences (SA2S1 and SA2S2) have been found and analysed. The observed polymorphism suggests the existence of multiple isoforms for Sin a I allergen. SA2S2 has been expressed as a fusion protein, linked to the choline-binding domain of the Streptococcus pneumoniae murein hydrolase. The resulted fusion protein is recognized by Sin-a-I-specific antibodies.