Catalyzes the reversible transfer of high energy ATP gamma-phosphate group to L-arginine (PubMed:17496423, PubMed:27072556, PubMed:22750864, PubMed:23873077). Has nucleoside diphosphate kinase-like activity toward dTDP. Binds and phosphorylates dTDP using ATP as a phosphate donor. Does not phosphorylate dADP, dCDP, dGDP, dTMP or thymidine (PubMed:27072556). ATP + L-arginine = ADP + H(+) + N(omega)-phospho-L-arginine ATP + dTDP = ADP + dTTP Monomer. Muscle (at protein level). Causes an allergic reaction in human. Binds to IgE in 100% of the 5 shrimp-allergic patients tested. Belongs to the ATP:guanido phosphotransferase family.