label: protein-N-terminal glutamine amidohydrolase activity
label_lc: protein-n-terminal glutamine amidohydrolase activity
description: "Catalysis of the reaction: N-terminal L-glutaminyl-[protein] + H2O = N-terminal L-glutamyl-[protein] + NH3. This reaction is the deamidation of an N-terminal glutamine residue of a protein."