There are 2 allergenic proteins found in pumpkins, Cuc ma 4 and Cuc ma 5. The first is an 11S seed storage protein and the second is a 2S seed storage protein.
Pumpkins are not currently associated with any allergic syndromes.
Other food containing 2S albumin seed storage proteins are cashews, peanuts, almonds, mustard seed, rapeseed, turnip, chickpeas, hazelnuts, pistachio, buckwheat, soya beans, sunflower seeds, brazil nuts, walnuts, kiwi, castor beans and sesame seeds.
There is a lot of cross reactivity between 2S and 11S seed storage proteins, most of the foods above contain both types of seed storage proteins.