DGK/DAK plays an essential role in generating the deoxyribonucleotide precursors, dGTP and dATP, for DNA metabolism. 2'-deoxyguanosine + ATP = ADP + dGMP + H(+) Heterodimer of a deoxyadenosine (DAK) and a deoxyguanosine kinase (DGK). Belongs to the DCK/DGK family.