Hosta

D-glutamine + H₂O

\rightleftharpoons

D-glutamate + NH₃

Thus, the two substrates of this enzyme are D-glutamine and H₂O, whereas its two products are D-glutamate and NH₃.

This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds, specifically in linear amides. The systematic name of this enzyme class is D-glutamine amidohydrolase. This enzyme participates in d-glutamine and d-glutamate metabolism and nitrogen metabolism.

References

Domnas A, Catimo EC (1965). "The behavior of amidohydrolases and L-glutamate in synchronized populations of Blastocladiella emeronii". Phytochemistry. 4 (2): 273–284. doi:10.1016/S0031-9422(00)86173-7.

Hydrolases: carbon-nitrogen non-peptide (EC 3.5)
3.5.1: Linear amides / Amidohydrolases	Asparaginase Glutaminase Urease Biotinidase Aminoacylase ACY1 Aspartoacylase(ACY2) ACY3 Ceramidase Aspartylglucosaminidase Fatty acid amide hydrolase Histone deacetylase Sirtuin
3.5.2: Cyclic amides/ Amidohydrolases	Barbiturase Beta-lactamase Dihydroorotase
3.5.3: Linear amidines/ Ureohydrolases	Arginase Agmatinase Protein-arginine deiminase
3.5.4: Cyclic amidines/ Aminohydrolases	Guanine deaminase Adenosine deaminase AMP deaminase Inosine monophosphate synthase DCMP deaminase GTP cyclohydrolase I Cytidine deaminase AICDA Activation-induced cytidine deaminase
3.5.5: Nitriles/ Aminohydrolases	Nitrilase
3.5.99: Other	Riboflavinase Thiaminase II

Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)