Figure 2

Construction and evaluation of a SAV3 based replicon. A) A SAV3 replicon is launched from the CMV promoter (red arrow) in the pVAX1 backbone, and transcription stops at the BGH polyA signal (red box). A synthetic DNA encoding a hammerhead ribozyme was fused to the SAV3 5'-UTR and a polyadenylated tail was fused to the 3'-UTR. The ORF encoding the SAV3 structural proteins was replaced by an ORF encoding EGFP inserted between introduced AgeI and AscI sites. Position of the EcoRI site used for restriction enzyme analysis is indicated. B) Restriction enzyme analysis by digestion of pmSAV3 with EcoRI, AgeI and AscI. Lane 1: Smartladder (Eurogentec). Lane 2: pmSAV3 after triple digest with EcoRI, AgeI and AscI. Bands corresponding to the pVAX1 backbone, nsP coding sequence and EGFP coding sequence are indicated. C) Expression of EGFP in BF2 cells after transfection with pmSAV3. Both CHSE and BF2 cells facilitated successful expression of the EGFP reporter. EGFP expression became visible from day 2 p.t. in CHSE cells and 3 d.p.t. in BF2 cells.