Deference in Motif V suggests that insect CSASs coordinate metal cofactors differently from counterparts in vertebrates and bacteria. |
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The first aspartic acid of
the DID triad (*) is required for coordinating a catalytic metal cofactor in the active site of bacterial and vertebrate CSAS enzymes. Site-directed mutagenesis suggests that the third D of the EID triad is essential for metal coordination in insect CSAS (Mertsalov et al. 2016). |