Allergenicity assessment of osmotin, a pathogenesis-related protein, used for transgenic crops

Prerna Sharma, Abinav Kumar Singh, Bhanu Pratap Singh, Shailendra Nath Gaur, Naveen Arora

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Genetic engineering can enhance abiotic stress tolerance of plants, thereby increasing productivity. The present study investigates allergenicity of osmotin protein used for developing transgenic crops. Bioinformatic analysis of osmotin was performed using SDAP and Farrp allergen databases. Osmotin was cloned in pET22b+ vector, purified to homogeneity, and analyzed for digestibility, heat stability, and IgE binding using atopic patients' sera. Osmotin showed 40-92% and 48-75% homology with allergens in SDAP and Farrp databases, respectively. These cross-reactive allergens were from apple, tomato, peach, capsicum, kiwi fruit, and cypress. Osmotin was resistant to pepsin digestion and heat treatment at 90 °C for 1 h. Osmotin protein showed dose-dependent inhibition with pooled patients' sera. It showed significant IgE binding with 22 of 117 patients' sera who were sensitized to tomato and apple, thus indicating cross-reactivity among tomato, apple, and osmotin allergens. In conclusion, osmotin was identified as a potential allergen and showed cross-reactivity with tomato and apple allergens.

Original languageEnglish (US)
Pages (from-to)9990-9995
Number of pages6
JournalJournal of Agricultural and Food Chemistry
Issue number18
StatePublished - Sep 28 2011
Externally publishedYes


  • Genetic engineering
  • Nicotiana tabacum
  • allergenicity
  • cross-reactivity
  • food allergy
  • genetically modified food
  • osmotin
  • pathogenesis related protein
  • transgenic crops

ASJC Scopus subject areas

  • General Chemistry
  • General Agricultural and Biological Sciences


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