Abstract
Main conclusion
The ribosome inactivating protein BE27 displays several biological activities in vitro that could result in a broad action against several types of pathogens.
Beetin 27 (BE27), a ribosome-inactivating protein (RIP) from sugar beet (Beta vulgaris L.) leaves, is an antiviral protein induced by virus and signaling compounds such as hydrogen peroxide and salicylic acid. Its role as a defense protein has been attributed to its RNA polynucleotide:adenosine glycosidase activity. Here we tested other putative activities of BE27 that could have a defensive role against pathogens finding that BE27 displays rRNA N-glycosidase activity against yeast and Agrobacterium tumefaciens ribosomes, DNA polynucleotide:adenosine glycosidase activity against herring sperm DNA, and magnesium-dependent endonuclease activity against the supercoiled plasmid PUC19 (nicking activity). The nicking activity could be a consequence of an unusual conformation of the BE27 active site, similar to that of PD-L1, a RIP from Phytolacca dioica L. leaves. Additionally, BE27 possesses superoxide dismutase activity, thus being able to produce the signal compound hydrogen peroxide. BE27 is also toxic to COLO 320 cells, inducing apoptosis in these cells by either activating the caspase pathways and/or inhibiting protein synthesis. The combined effect of these biological activities could result in a broad action against several types of pathogens such as virus, bacteria, fungi or insects.
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Abbreviations
- NBT:
-
4-Nitro blue tetrazolium
- SOD:
-
Superoxide dismutase
- SRL:
-
Sarcin ricin loop
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Acknowledgments
This work was supported by Grants FISPI04/1279 to J. M. F., BIO39/VA42/10 to L. C. and funds from the Second University of Naples. We thank Judy Callaghan (Monash University, Melbourne, Australia) for correcting the manuscript.
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Iglesias, R., Citores, L., Di Maro, A. et al. Biological activities of the antiviral protein BE27 from sugar beet (Beta vulgaris L.). Planta 241, 421–433 (2015). https://doi.org/10.1007/s00425-014-2191-2
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DOI: https://doi.org/10.1007/s00425-014-2191-2