Has a dual function in both nitrogen assimilation and in protection against acid stress during infection through asparagine hydrolysis and NH4(+) release. Catalyzes asparagine hydrolysis. H2O + L-asparagine = L-aspartate + NH4(+) Probably secreted via the ESX-5 / type VII secretion system (T7SS). Belongs to the asparaginase 1 family.