Aspartate/asparagine-β-hydroxylase crystal structures reveal an unexpected epidermal growth factor-like domain substrate disulfide pattern

AspH catalyses hydroxylation of asparagine and aspartate residues in epidermal growth factor-like domains (EGFDs). Here, the authors present crystal structures of AspH with and without substrates and show that AspH uses EFGD substrates with a non-canonical disulfide pattern.