142 Nucleoside-2-P kinase NDK_AQUAE aq_1590 Nucleoside diphosphate kinase Major role in the synthesis of nucleoside triphosphates other than ATP. The ATP gamma phosphate is transferred to the NDP beta phosphate via a ping-pong mechanism, using a phosphorylated active-site intermediate. MAVERTLIIVKPDAMEKGALGKILDRFIQEGFQIKALKMFRFTPEKAGEFYYVHRERPFFQELVEFMSSGPVVAAVLEGEDAIKRVREIIGPTDSEEARKVAPNSIRAQFGTDKGKNAIHASDSPESAQYEICFIFSGLEIV ndk