Nucleoside-2-P kinase NDK_STRR6 137 ndk 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. MEQTFFIIKPDGVKRGLVGEVLKRIEQRGFTIEKLEFRSQVSEELIDQHYQDLVGQSFYPPIREFMTSGPVLVGVISGPKVIETWRTMMGATRPEEALPGTIRGDFAKAAGENEIIQNVVHGSDSEESAKREIALWF spr1775