Abstract
Most of the viral diseases of plants are caused by RNA viruses which drastically reduce crop yield. In order to generate resistance against RNA viruses infecting plants, we isolated the dicer 1 protein (CaDcr1), a member of RNAse III family (enzyme that cleaves double stranded RNA) from an opportunistic fungus Candida albicans. In vitro analysis revealed that the CaDcr1 cleaved dsRNA of the coat protein gene of cucumber mosaic virus (genus Cucumovirus, family Bromoviridae). Furthermore, we developed transgenic tobacco plants (Nicotiana tabacum cv. Xanthi) over-expressing expressing CaDcr1 by Agrobacterium mediated transformation. Transgenic tobacco lines were able to suppress infection of an Indian isolate of potato virus X (genus Potexvirus, family Alphaflexiviridae). The present study demonstrates that CaDcr1 can cleave double stranded replicative intermediate and provide tolerance to plant against RNA viruses.
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Financial support from the Council for Scientific and Industrial Research, Govt. of India vide Grant No. 38(1300)/11/EMR-11 to SC is gratefully acknowledged.
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Fig. S1
Confirmation of the recombinant CaDcr1 protein by MALDI analysis (TIFF 548 kb)
Fig. S2
Secondary structure of the coat protein transcripts of CMV and free energy value using GeneBee software.(a) Secondary structure of transcript of CMV-AUR(-133.6 kcal/mol free energy) (b) Secondary structure of transcript of CMV-PUNE (-147.0 kcal/mol free energy) (TIFF 2794 kb)
Fig. S3
Hyperchromicity Graph for determination melting point of secondary structure of the coat protein transcripts of CMV using Poland Software.(a) AUR RNA (100 °C) and (b) PUNE RNA (100 °C) (TIFF 83 kb)
Fig. S4
Prediction of allergenicity of CaDcr1. Non-Allergic nature of CaDcr1 was established using the Structural database of Allergen Protein (SDAP) software. The allergenicity value ranges between 3 to 11% that are much lower than the required threshold value (35%) as set for known allergens (indicated as Red horizontal line) (TIFF 215 kb)
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Alam, C.M., Jain, G., Kausar, A. et al. Dicer 1 of Candida albicans cleaves plant viral dsRNA in vitro and provides tolerance in plants against virus infection. VirusDis. 30, 237–244 (2019). https://doi.org/10.1007/s13337-019-00520-x
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DOI: https://doi.org/10.1007/s13337-019-00520-x