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Antimicrobial peptides fromMirabilis jalapa andAmaranthus caudatus: expression, processing, localization and biological activity in transgenic tobacco

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Abstract

The cDNAs encoding the seed antimicrobial peptides (AMPs) fromMirabilis jalapa (Mj-AMP2) andAmaranthus caudatus (Ac-AMP2) have previously been characterized and it was found that Mj-AMP2 and Ac-AMP2 are processed from a precursor preprotein and preproprotein, respectively [De Bolleet al., Plant Mol Biol 28:713–721 (1995) and 22:1187–1190 (1993), respectively]. In order to study the processing, sorting and biological activity of these antimicrobial peptides in transgenic tobacco, four different gene constructs were made: a Mj-AMP2wild-type gene construct, a Mj-AMP2 mutant gene construct which was extended by a sequence encoding the barley lectin carboxyl-terminal propeptide, a known vacuolar targeting signal [Bednarek and Raikhel, Plant Cell 3: 1195–1206 (1991)]; an Ac-AMP2wild-type gene construct; and finally, an Ac-AMP2 mutant gene construct which was truncated in order to delete the sequence encoding the genuine carboxyl-terminal propeptide. Processing and localization analysis indicated that an isoform of Ac-AMP2 with a cleaved-off carboxyl-terminal arginine was localized in the intercellular fluid fraction of plants expressing eitherwild-type or mutant gene constructs. Mj-AMP2 was recovered extracellularly in plants transformed with Mj-AMP2wild-type gene construct, whereas an Mj-AMP2 isoform with a cleaved-off carboxyl-terminal arginine accumulated intracellularly in plants expressing the mutant precursor protein with the barley lectin propeptide. Thein vitro antifungal activity of the AMPs purified from transgenic tobacco expressing any of the four different precursor proteins was similar to that of the authentic proteins. However, none of the transgenic plants showed enhanced resistance against infection with eitherBotrytis einerea orAlternaria longipes.

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Authors and Affiliations

  1. F.A. Janssens Laboratory of Genetics, Katholieke Universiteit Leuven, Willem de Croylaan 42, B-3001, Heverlee, Belgium

    Miguel F. C. De Bolle, Inge J. Goderis, Liesbet Noe & Willem F. Broekaert

  2. Zeneca Agrochemicals, Jealott's Hill Research Station, RG24 6ET, Bracknell, Berkshire, UK

    Rupert W. Osborn, David Acland & Cliff A. Hart

  3. Center of Human Genetics, Katholieke Universiteit Leuven, Herestraat 49, B-3000, Leuven, Belgium

    Sophie Torrekens & Fred Van Leuven

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  1. Miguel F. C. De Bolle
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  2. Rupert W. Osborn
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  3. Inge J. Goderis
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  4. Liesbet Noe
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  9. Willem F. Broekaert
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De Bolle, M.F.C., Osborn, R.W., Goderis, I.J. et al. Antimicrobial peptides fromMirabilis jalapa andAmaranthus caudatus: expression, processing, localization and biological activity in transgenic tobacco. Plant Mol Biol 31, 993–1008 (1996). https://doi.org/10.1007/BF00040718

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