Why are polymerases categorized as transferases?

A—P + B ⇔ B—P + A
This is the general formula for the phosphotransferase category (of which polymerase is a member of).

deoxynucleoside triphosphate + DNA_n = diphosphate + DNA_n+1

And that is polymerase's general formula - it seems the two do not match up?

Question

Why are polymerases categorized as transferases?

A—P + B ⇔ B—P + A
This is the general formula for the phosphotransferase category (of which polymerase  is a member of).

deoxynucleoside triphosphate + DNA_n = diphosphate + DNA_n+1

And that is polymerase's general formula - it seems the two do not match up?

anonymous · Answer

The formula for polymerase looks more like: A—P + B ⇔ A—B + P (where A is the deoxynucleoside and B is the DNA strand)