Fig. 1
From: Functional analysis of a viral promoter from a strawberry vein banding virus isolate from China
Schematic representations of the expression vectors. A The full-length SVBV SP1 promoter and its deletion mutants. B Schematic illustration of pINT-FLt-US. C Schematic illustration of pCHF-FLt-US. SP1 is a full-length SVBV Chinese isolate promoter and mutant SP2 promoter contained a fragment of SP1, ranging from nucleotides − 324 bp ~  + 1, and retained only the downstream core promoter region with a GA-motif and two CAAT-boxes. Mutant SP3 promoter had a deletion from nucleotide position − 984 ~ -819 bp and thus represented the upstream regulatory elements plus the core promoter region. Mutant SP4 promoter contained the full-length promoter sequence except the 30 nucleotides upstream of the transcription initiation site (+ 1)