Rational Design, Structure-Activity Relationship, and Immunogenicity of Hypoallergenic Pru p 3 Variants

Stephanie Eichhorn, Angelika Hörschläger, Markus Steiner, Josef Laimer, Bettina M Jensen, Serge A Versteeg, Isabel Pablos, Peter Briza, Laurian Jongejan, Neil Rigby, Juan A Asturias, Antonio Portolés, Montserrat Fernandez-Rivas, Nikolaos G Papadopoulos, Adriano Mari, Lars K Poulsen, Peter Lackner, Ronald van Ree, Fatima Ferreira, Gabriele Gadermaier*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

SCOPE: Allergies to lipid transfer proteins involve severe adverse reactions; thus, effective and sustainable therapies are desired. Previous attempts disrupting disulfide bonds failed to maintain immunogenicity; thus, the aim is to design novel hypoallergenic Pru p 3 variants and evaluate the applicability for treatment of peach allergy.

METHODS AND RESULTS: Pru p 3 proline variant (PV) designed using in silico mutagenesis, cysteine variant (CV), and wild-type Pru p 3 (WT) are purified from Escherichia coli. Variants display homogenous and stable protein conformations with an altered secondary structure in circular dichroism. PV shows enhanced long-term storage capacities compared to CV similar to the highly stable WT. Using sera of 33 peach allergic patients, IgE-binding activity is reduced by 97% (PV) and 71% (CV) compared to WT. Both molecules show strong hypoallergenicity in Pru p 3 ImmunoCAP cross-inhibition and histamine release assays. Immunogenicity of PV is demonstrated with a phosphate-based adjuvant formulation in a mouse model.

CONCLUSIONS: An in silico approach is used to generate a PV without targeting disulfide bonds, T cell epitopes, or previously reported IgE epitopes of Pru p 3. PV is strongly hypoallergenic while structurally stable and immunogenic, thus representing a promising candidate for peach allergen immunotherapy.
Original languageEnglish
Article number1900336
Pages (from-to)1-10
JournalMolecular Nutrition and Food Research
Volume63
Issue number18
DOIs
Publication statusPublished - Sep 2019

Fields of Science and Technology Classification 2012

  • 304 Medical Biotechnology
  • 106 Biology

Keywords

  • Pru p 3
  • allergen immunotherapy
  • hypoallergens
  • lipid transfer proteins
  • peach allergies

Cite this

Eichhorn, S., Hörschläger, A., Steiner, M., Laimer, J., Jensen, B. M., Versteeg, S. A., Pablos, I., Briza, P., Jongejan, L., Rigby, N., Asturias, J. A., Portolés, A., Fernandez-Rivas, M., Papadopoulos, N. G., Mari, A., Poulsen, L. K., Lackner, P., van Ree, R., Ferreira, F., & Gadermaier, G. (2019). Rational Design, Structure-Activity Relationship, and Immunogenicity of Hypoallergenic Pru p 3 Variants. Molecular Nutrition and Food Research, 63(18), 1-10. [1900336]. https://doi.org/10.1002/mnfr.201900336