Catalyzes the reversible transfer of high energy ATP gamma-phosphate group to L-arginine. ATP + L-arginine = ADP + H(+) + N(omega)-phospho-L-arginine Optimum pH is 8.5. Optimum temperature is 30 degrees Celsius. Expressed during ovarian development. The highest expression level is detected at stages I (immature with gonado-somatic index (GSI) <2%) and II (late immature with GSI 2% to 3%) of ovarian maturation. Expression decreases from stage III (early mature with GSI 3% to 6%) to V (ripe with GSI >9%), but increases in between at stage IV (late mature with GSI 6% to 9%) of ovarian maturation. Causes an allergic reaction in human. Binds to IgE in 100% of the 13 shrimp-allergic patients tested. Belongs to the ATP:guanido phosphotransferase family.