Cleaves the GlcNAc-Asn bond which joins oligosaccharides to the peptide of asparagine-linked glycoproteins. H2O + N(4)-(beta-N-acetyl-D-glucosaminyl)-L-asparagine = H(+) + L-aspartate + N-acetyl-beta-D-glucosaminylamine Heterotetramer of two alpha and two beta chains arranged as a dimer of alpha/beta heterodimers. Cleaved into an alpha and beta chain by autocatalysis; this activates the enzyme. The N-terminal residue of the beta subunit is responsible for the nucleophile hydrolase activity (By similarity). Belongs to the Ntn-hydrolase family. Intron retention.