Protein
Deoxyadenosine/deoxycytidine kinase
Organism
Bacillus subtilis (strain 168)
Function
Plays an essential role in generating the deoxyribonucleotide precursors dATP AND dCTP for DNA metabolism. The phosphate acceptor specificity is strict toward deoxyadenosine (dAdo) and deoxycytidine (dCyd). The specificity toward the sugar moiety of the nucleoside is less strict. Both 2-deoxyribose, ribose, and arabinose nucleosides are phosphorylated, although the 2-deoxyribonucleosides are preferred. The phosphate donor specificity is dependent on the deoxyribonucleoside substrate, but GTP is efficient with both deoxycytidine and deoxyadenosine. Only nucleoside triphosphates can act as phosphate donors.
Similarity
Belongs to the DCK/DGK family.
Sequence
MKEHHIPKNSIITVAGTVGVGKSTLTKTLAKRLGFKTSLEEVDHNPYLEKFYHDFERWSFHLQIYFLAERFKEQKTIFEAGGGFVQDRSIYEDTGIFAKMHADKGTMSKVDYKTYTSLFEAMVMTPYFPHPDVLIYLEGDLENILNRIEQRGREMELQTSRSYWEEMHTRYENWISGFNACPVLKLRIEDYDLLNDENSIENIVDQIASVIHDNQKK