A. The oligonucleotide-directed RNaseH assay. Internally radiolabeled RNA is bound to a complementary DNA oligonucleotide, and the RNaseH cleaves the RNA within the DNA:RNA heteroduplexes. RNA, black line; DNA, grey line; S, RNA substrate; P1 and P2, RNaseH cleavage products. B. Representative primary screening assay employing HBV genotype D RNaseH. DMSO, vehicle control. C.
E. coli RNaseH activity was not affected by compound #1 in the oligonucleotide-directed cleavage assay under identical conditions.