Man e 5 is the main protein in cassava that causes allergic reactions. This is a Glutamic acid rich protein, similar in structure to hevein.
Cassava allergy can be linked to Latex Food Syndrome as the main allergen is similar in structure to hevein, which can cause problems in people with a latex allergy.
I have put together some more comprehensive resources at http://www.allergyresources.co.uk/Papaya.php
The allergy resources page for cassava covers the key allergens, which allergic syndromes are linked to this allergy and other foods which are commonly cross reactive with cassava.
There is also regularly updated links to useful websites specifically for cassava 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.