Protein-arginine deiminase

In enzymology, a protein-arginine deiminase (EC3.5.3.15) is an enzyme that catalyzes a form of post translational modification called arginine de-imination or citrullination:

Thus, the two substrates of this enzyme are protein L-arginine and H₂O, whereas its two products are protein L-citrulline and NH₃.