Plant Molecular Biology

, Volume 94, Issue 1–2, pp 33–44 | Cite as

Identification of the ligand of Pru p 3, a peach LTP

  • Nuria Cubells-Baeza
  • Cristina Gómez-Casado
  • Leticia Tordesillas
  • Carmen Ramírez-Castillejo
  • María Garrido-Arandia
  • Pablo González-Melendi
  • María Herrero
  • Luis F. Pacios
  • Araceli Díaz-Perales
Article

Abstract

Key message

Pru p 3, a peach LTP, is located in pollinated flower styles and secreting downy hairs, transporting a derivative of camptothecin bound to phytosphingosine. Pru p 3 may inhibit a second pollination and may keep away herbivores until seed maturation.

Abstract

The allergen Pru p 3, a peach lipid transfer protein, has been well studied. However, its physiological function remains to be elucidated. Our results showed that Pru p 3 usually carries a lipid ligand that play an essential role in its function in plants. Using ESI-qToF, we observed that the ligand was a derivative of camptothecin binding to phytosphingosine, wich that is inserted into the hydrophobic tunnel of the protein. In addition, the described ligand displayed topoisomerase I activity inhibition and self-fluorescence, both recognized as camptothecin properties. During flower development, the highest expression of Pru p 3 was detected in the styles of pollinated flowers, in contrast to its non-expression in unpollinated pistils, where expression decreased after anthesis. During ripening, the expression of Pru p 3 were observed mainly in peel but not in pulp. In this sense, Pru p 3 protein was also localized in trichomes covering the fruit epidermis.

Keywords

Pru p 3 Lipid transfer protein Secondary metabolites Camptothecin Flower development Pollination Fruit development 

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • Nuria Cubells-Baeza
    • 1
    • 2
  • Cristina Gómez-Casado
    • 3
  • Leticia Tordesillas
    • 4
  • Carmen Ramírez-Castillejo
    • 1
    • 2
  • María Garrido-Arandia
    • 1
    • 2
  • Pablo González-Melendi
    • 1
    • 2
  • María Herrero
    • 5
  • Luis F. Pacios
    • 1
    • 6
  • Araceli Díaz-Perales
    • 1
    • 2
  1. 1.Centre for Plant Biotechnology and Genomics (UPM-INIA)Pozuelo de Alarcón, MadridSpain
  2. 2.Department of Biotechnology-Plant BiologyETSIAAB, Technical University of MadridMadridSpain
  3. 3.Department of Experimental Medical SciencesLund UniversityLundSweden
  4. 4.Icahn School of Medicine at Mount SinaiNew YorkUSA
  5. 5.Estación Experimental de Aula Dei (CSIC)ZaragozaSpain
  6. 6.Department of Natural Systems and ResourcesETSI Montes, Technical University of MadridMadridSpain

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