What are alpha gliadins?

Some articles on gliadin, alpha gliadin:

Triticeae Glutens - Prolamins and Glutelins - Chemical Behavior - As Substrates For Enzymes
... In gliadin the -QQP-, -QVP-, -QLP-, -QYP- tripeptides in the context of favorable adjacent peptides are readily deamidated ... Most proteins have few or no such transglutaminase sites however alpha gliadin has 13 such sites ... Human tissue transglutaminase not only deamidates gliadin, but it also crosslinks itself to gliadin, which has immunological consequences ...

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