This family of enzymes catalyse the deamindation of N-terminal asparagines in peptides and proteins to aspartic acid [1-2].

1: Protein NH2-terminal asparagine deamidase. Isolation and characterization of a new enzyme. Stewart AE, Arfin SM, Bradshaw RA; J Biol Chem. 1994;269:23509-23517. PMID:8089117

2: A mouse amidase specific for N-terminal asparagine. The gene, the enzyme, and their function in the N-end rule pathway. Grigoryev S, Stewart AE, Kwon YT, Arfin SM, Bradshaw RA, Jenkins NA, Copeland NG, Varshavsky A; J Biol Chem. 1996;271:28521-28532. PMID:8910481