CaMV35S is the most extensively used promoter for ectopic gene expression in plant system. However, multiple use of this promoter possesses several limitation i.e. homologous based gene silencing and differential suitability in monocot and dicot plants. The strength of a promoter is defined by the presence of cis-acting elements and trans acting nucleic binding factors, thus its strength can be regulated by changing the architecture of these regulatory elements. In the present study, eight hybrid promoters were designed from two parareteroviruses, rice tungro bacilliform viruses (RTBV) and mirabilis mosaic virus (MMV). The eight hybrid promoters, along with parental promoters were characterized for the presence of functional cis-elements and transcription factor binding sites (TFBS), which were predicted using bioinformatics tools such as PLACE and Matinspector. Presence of mirabilis mosaic virus modules for specific functions and over-represented modules was determined using Model inspector. A broad range of cis-elements (85), TFBS (1471) was obtained. Presence of Dehydration responsive element binding factors, Apetala 2 (AP2), WRKY, DNA binding with one finger DOF (DOFF) motifs had shown the functional relevance of these designed promoters with abiotic stress inducibility. In addition to these stress regulating TFBS, the presence of some enhancer like motifs such as P$OCSE, P$TERE, P$TODS, P$ASRC had shown the functional relevance of these promoters as a strong candidate for enhanced expression of ectopic gene.
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We were grateful to DAE-BRNS (Mumbai), India (Project Sanction No. 37(1)/14/40/2014- BRNS/1423) for financial support.
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Gupta, D., Ranjan, R. In silico characterization of synthetic promoters designed from mirabilis mosaic virus and rice tungro bacilliform virus. VirusDis. 31, 369–373 (2020). https://doi.org/10.1007/s13337-020-00617-8
- Synthetic promoter
- Transcription factor