Hordeins are found in the endosperm where one of their functions is to act as a storage unit.
[1] In relation to amino acids, hordeins have a substantial amount of proline and glutamine but lack charged amino acids such as lysine.
[1] Some people are sensitive to hordein due to disorders such as celiac disease or gluten intolerance.
Hordein is usually the main problem for coeliacs wishing to drink beer.
Coeliacs are able to find specialist breads that are low in hordein, gliadin and other problematic glycoproteins, just as they can find gluten free beer which either uses ingredients that do not contain gluten, or otherwise has the amounts of gliadin or hordein present controlled to stated limits.