Figure 1.
Schematic representation of frameshift reporter constructs. ORF1 (19 kD) is in the 0 frame and ORF2 (46 kD) is in the −1 translational frame with respect to ORF1. The appearance of the 65 kD fusion protein represents the occurrence of −1 frameshifting. The UUUAAAC slippery sequence is indicated in italics. The 0-reading frame and −1 reading frames codons are indicated above and below the sequences, respectively. RNA18, 12, 15, 9 and 6 are antisense RNA oligonucleotides complementary to the indicated region downstream of the slippery sequence in SF468 mRNA.