Catalyzes the reversible transfer of high energy ATP gamma-phosphate group to L-arginine. ATP + L-arginine = ADP + H(+) + N(omega)-phospho-L-arginine No change in activity after supplementation with 10 mM glucose. However, activity decreases significantly when glucose concentration is higher than 50 mM and almost all activity is lost with 200 mM glucose. Activity is significantly increased after treatment with 10 mM and 50 mM ATP. However, activity drops significantly with 200 mM ATP. Inhibited by 10-200 mM alpha-ketoglutarate. No change in activity after incubation with 10-200 mM L-citrulline, L-ornaline or glycerol. Expressed in muscle (at protein level). Expressed in muscle, heart, nerve, stomach and hemocytes, with the highest expression in muscle. Very low expression in eyestalk and intestine. Not expressed in hepatopancreas, gill and skin. By LPS immunostimulation. In hemocytes, expression increases sharply at 3 hours, decreases slightly at 6 hours, increases significantly again at 24 hours and decreases at 48 hours after LPS injection. In muscle, expressed less than the control in the first 6 hours, then the expression increases strikingly from 6 to 24 hours and decreases at 48 hours after LPS injection. Causes an allergic reaction in human. Binds to IgE (Probable). Belongs to the ATP:guanido phosphotransferase family.