There are 7 allergens associated with tomato allergy – the main allergen in tomato is Sola l 4 which is similar in shape to the Bet v 1 allergens which can cause oral allergy type symptoms.
Three of the proteins found in tomato are lipid transfer proteins, Sola l 3, 6 and 7.
I have put together some more comprehensive resources at http://www.allergyresources.co.uk/Tomato.php
The allergy resources page for tomato covers the key allergens, which allergic syndromes are linked to this allergy and other foods which are commonly cross reactive with tomato.
There is also regularly updated links to useful websites specifically for tomato allergies and the latest research papers on the topic.
If you have multiple allergies and are interested in how they are linked or want to find out more about food allergies outside the usual top 14 then you can follow me on Facebook or Twitter, where I share a food allergy card every day of the week.