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Two Plant Puroindolines Colocalize in Wheat Seed and in vitro Synergistically Fight Against Pathogens

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Abstract

Puroindolines, for years largely investigated for their involvement in wheat kernel hardness, have recently attracted attention thanks to their possible role as antimicrobial proteins. With the aim to enhance our knowledge of these proteins we studied their localization in the kernel, and their antimicrobial activity in vitro against six different bacterial strains. Immunolocalization showed that both the PINs are strongly concentrated in the aleurone layer, but also highly present in the endosperm. Interestingly we observed that puroindolines not only have the same spatial distribution in the kernel, they are also always found co-localized. Their co-localization suggests that they could cooperate in defending the plant against pathogens. We therefore tested antimicrobial activity of PINA and PINB, and a putative synergism between these proteins. The results showed that the two polypeptides can in vitro inhibit growth of all the bacteria tested; furthermore when combined together they are able to enhance each other’s toxicity. In view of their antimicrobial activity and of their natural presence in Triticum aestivum wheat flour, puroindolines look promising antibacterial agents and thus deserve further studies aimed at establishing their possible future applications in fields of food and health care. Since PINs were still detectable in bakery products, these proteins may be promising tools in investigating natural ways of food preservation.

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Authors and Affiliations

  1. School of Biotechnological Sciences, University of Naples “Federico II”, Via Università 133, 80055, Portici, Naples, Italy

    Rosanna Capparelli, Maria Grazia Amoroso, Daniela Palumbo & Marco Iannaccone

  2. Dipartimento Scienze Ambientali, University of Siena, Via Mattioli 4, 53100, Siena, Italy

    Claudia Faleri & Mauro Cresti

Authors
  1. Rosanna Capparelli
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  2. Maria Grazia Amoroso
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  3. Daniela Palumbo
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  4. Marco Iannaccone
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  5. Claudia Faleri
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  6. Mauro Cresti
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Correspondence to Rosanna Capparelli.

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Capparelli, R., Amoroso, M.G., Palumbo, D. et al. Two Plant Puroindolines Colocalize in Wheat Seed and in vitro Synergistically Fight Against Pathogens. Plant Mol Biol 58, 857–867 (2005). https://doi.org/10.1007/s11103-005-8270-9

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  • DOI: https://doi.org/10.1007/s11103-005-8270-9

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