Glutaminase catalyzes the hydrolysis of glutamine to glutamic acid and plays a key role in nitrogen metabolism (By similarity). H2O + L-glutamine = L-glutamate + NH4(+) Belongs to the fungal glutaminase gtaA family. The predicted genes ARB_05535 and ARB_05536 have been merged into 1 gene: ARB_05535/05536. The predicted genes ARB_05535 and ARB_05536 have been merged into 1 gene: ARB_05535/05536.