– 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. Required for repair of UV radiation- and etoposide-induced DNA damage. NDPK Protein, S. cerevisiae, Recombinant (His) is expressed in yeast with N-6xHis tag. The predicted molecular weight is 19.2 kDa and the accession number is P36010.