Figure 3.
RNA-dependent DNA polymerase activity shown by WT HsPrimPol and Y89R variant. (A) Names and sequences of oligonucleotides used as template/primer hybrids to measure primer-dependent dNTP incorporation by HsPrimPol; RNA sequences are indicated in italics; ‘*’ indicates the radiolabeled oligonucleotide used as primer. (B) Polymerization reactions by WT or Y89R variant HsPrimPol was evaluated using the indicated combinations of dNTPs (100 μM each) and either DNA (T13T/Spc1) or RNA (T13U/Spc1) templates. As shown by electrophoretic analysis, primers (15-mer) elongated in 2, 4, 6 or 13 residues represent the expected products in the presence of either dATP, dATP+dGTP, dATP+dGTP+dTTP, or the four dNTPs, respectively.