Type-1 ribosome-inactivating protein from iris bulbs: a useful agronomic tool to engineer virus resistance?

Type-1 ribosome-inactivating protein from iris bulbs: a useful agronomic tool to engineer virus... To study the in planta antiviral activity of a type-1 ribosome-inactivating protein from iris bulbs, called IRIP,Nicotiana tabacumcv. Samsun NN was transformed with the IRIP sequence expressed under the control of the 35S cauliflower mosaic virus promoter. Molecular analysis of the transgenic plants and characterization of the purified protein revealed that the recombinant IRIP from tobacco leaves has the same molecular structure and RNA N-glycosidase activity as the native protein from iris bulbs. The tobacco transformants show no apparent phenotypic side effects indicating that ectopically expressed IRIP is not cytotoxic for tobacco cells. No induction of PR-1 could be demonstrated in the transgenic plants expressing IRIP. The in planta antiviral activity of rIRIP was assessed using a bioassay with tobacco mosaic virus. All transformed lines showed a statistically significant lower number of lesions compared to the control plants. The fortunate combination of in planta antiviral activity and lack of cytotoxicity of the ectopically expressed IRIP in transgenic tobacco renders the iris RIP an interesting and useful model for the study and exploitation of the antiviral activity of type-1 RIPs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Molecular Biology Springer Journals

Type-1 ribosome-inactivating protein from iris bulbs: a useful agronomic tool to engineer virus resistance?

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Publisher
Springer Journals
Copyright
Copyright © 2003 by Kluwer Academic Publishers
Subject
Life Sciences; Biochemistry, general; Plant Sciences; Plant Pathology
ISSN
0167-4412
eISSN
1573-5028
D.O.I.
10.1023/A:1022389205295
Publisher site
See Article on Publisher Site

Abstract

To study the in planta antiviral activity of a type-1 ribosome-inactivating protein from iris bulbs, called IRIP,Nicotiana tabacumcv. Samsun NN was transformed with the IRIP sequence expressed under the control of the 35S cauliflower mosaic virus promoter. Molecular analysis of the transgenic plants and characterization of the purified protein revealed that the recombinant IRIP from tobacco leaves has the same molecular structure and RNA N-glycosidase activity as the native protein from iris bulbs. The tobacco transformants show no apparent phenotypic side effects indicating that ectopically expressed IRIP is not cytotoxic for tobacco cells. No induction of PR-1 could be demonstrated in the transgenic plants expressing IRIP. The in planta antiviral activity of rIRIP was assessed using a bioassay with tobacco mosaic virus. All transformed lines showed a statistically significant lower number of lesions compared to the control plants. The fortunate combination of in planta antiviral activity and lack of cytotoxicity of the ectopically expressed IRIP in transgenic tobacco renders the iris RIP an interesting and useful model for the study and exploitation of the antiviral activity of type-1 RIPs.

Journal

Plant Molecular BiologySpringer Journals

Published: Oct 7, 2004

References

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