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Synthetic promoters from blueberry red ringspot virus (BRRV). | LitMetric
We analyzed the synthetic full-length transcript promoter of Blueberry red ringspot virus (BRRV) and developed two chimeric promoters (MBR3 and FBR3). Transcriptional activities of these chimeric promoters were found equivalent to that of the CaMV35S promoter. Chimeric promoters driven plant-derived PaDef protein showed high antimicrobial activities against several pathogens. Blueberry red ringspot virus (BRRV) is a pararetrovirus under the genus, Soymovirus belongs to the Caulimoviridae family. We have made a synthetic version of the BRRV-Flt promoter and analyzed its activity in detail. A 372 bp promoter fragment BR3 (- 212 to + 160) showed the strongest transcriptional activity compared with other fragments in both transient and transgenic assays; its activity was found near equivalent to that of the CaMV35S promoter. We constructed two chimeric promoters; MBR3 and FBR3 by fusing the UASs (Upstream activation sequences) of Mirabilis mosaic virus (MUAS; - 297 to - 38; 335 bp) and Figwort mosaic virus (FUAS; - 249 to - 54; 303 bp) respectively to the core promoter domain of BR3 (BR3; - 212 to + 160; 372 bp). The activities of MBR3 and FBR3 promoters were found equivalent to that of the activity of the CaMV35S promoter and approximately 4.0 (four) times stronger than that of the CaMV35S promoter. Histochemical and fluorometric GUS assays confirmed the above observation. The transcriptional efficacies of these recombinant promoters were tested by evaluating the antibacterial and antifungal activities of recombinant plant-derived antimicrobial peptide Persea americana var. drymifolia defensin (PaDef) driven under these promoters. Bioassays showed promising antifungal activities of the plant made PaDef against Alternaria alternata and antibacterial property against Gram-positive (S. aureus and R. fascians) and Gram-negative bacteria (E. coli and P. aeruginosa). Based upon the above results, MBR3 and FBR3 could be useful promoters for plant genetic engineering and can become useful substitutes for the widely used CaMV35S promoter in plant biology.
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