Dataset Information

Delineation of the olive pollen proteome: A focus on its allergen families reveals cyclophilin as a relevant allergen

ABSTRACT: The delineation of the olive pollen proteome and its allergogram can improve the clinical management of patients with this pollinosis. We here integrated the recently described wild olive genomic data in a comprehensive proteomic approach to get the annotated olive (Olea europaea) pollen proteome and complete its complex allergogram. Olive pollen proteins were identified by LC-MS/MS using predicted protein sequences from its genome. GO annotation, KEGG Pathway analysis and identification of allergen families were performed by bioinformatics. Recombinant DNA, protein expression and purification, and immunological analyses were used to characterize putative allergens. A total of 1,907 proteins were identified. 60% of the proteins were predicted to possess catalytic activity and be involved in metabolic processes. 203 proteins belonging to 47 allergen families were found, with 37 non-previously described in olive pollen. Of four potential allergens produced in Escherichia coli, a peptidyl-prolyl cis-trans isomerase -cyclophilin-, masked in the protein extract by the major allergen Ole e 1, was found as a new olive pollen allergen (Ole e 15). 63% of the Ole e 15-sensitized patients were children and showed strong IgE recognition of the allergen. Ole e 15 shared high sequence identity with other plant, animal and fungal cyclophilins and a high IgE cross-reactivity with pollen, plant food and animal extracts. Taken together, the combination of available genomic data with proteomics permitted the profiling of the olive pollen proteome, revealing the spectrum of allergen families and cyclophilin as a new relevant allergen implicated in cross-reactivity.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Olea Europaea (common Olive)

TISSUE(S): Pollen

SUBMITTER: Rodrigo Barderas

LAB HEAD: Rodrigo Barderas

PROVIDER: PXD012280 | Pride | 2019-06-17

REPOSITORIES: Pride

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Delineation of the Olive Pollen Proteome and Its Allergenome Unmasks Cyclophilin as a Relevant Cross-Reactive Allergen.

San Segundo-Acosta Pablo P Oeo-Santos Carmen C Benedé Sara S de Los Ríos Vivian V Navas Ana A Ruiz-Leon Berta B Moreno Carmen C Pastor-Vargas Carlos C Jurado Aurora A Villalba Mayte M Barderas Rodrigo R

Journal of proteome research 20190627 8

Olive pollen is a major allergenic source worldwide due to its extensive cultivation. We have combined available genomics data with a comprehensive proteomics approach to get the annotated olive tree (<i>Olea europaea</i> L.) pollen proteome and define its complex allergenome. A total of 1907 proteins were identified by LC-MS/MS using predicted protein sequences from its genome. Most proteins (60%) were predicted to possess catalytic activity and be involved in metabolic processes. In total, 203 ...[more]

PMID: 31192604

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Project description:Background: Respiratory allergy triggered by pollen allergens is increasing at an alarming rate worldwide. Sunflower pollen is thought to be an important source of inhalant allergens. Present study aims to identify the prevalence of sunflower pollinosis among the Indian allergic population and characterizes the pollen allergens using immuno-proteomic tools. Methodology: Clinico-immunological tests were performed to understand the prevalence of sensitivity towards sunflower pollen among the atopic population. Sera from selected sunflower positive patients were used as probe to detect the IgE-reactive proteins from the one and two dimensionally separated proteome of sunflower pollen. The antigenic nature of the sugar moiety of the glycoprotein allergens was studied by meta-periodate modification of IgE-immunoblot. Finally, these allergens were identified by mass-spectrometry (MALDI TOF/TOF and LC ESI qTOF). MASCOT searching was performed against NCBInr database. However, Helianthus annuus genome is not fully sequenced and partially annotated. So in case of low confidence (p> 0.05) protein identification, searching was performed against EST library of Helianthus annuus. Results: Prevalence of sunflower pollen allergy was observed among 21% of the atopic population and associated with elevated level of specific IgE and histamine in the sera of these patients. Immunoscreening of sunflower pollen proteome with patient serum detected seven IgE-reactive proteins with varying molecular weight and pI. Hierarchical clustering of 2D-immunoblot data highlighted three allergens characterized by a more frequent immuno-reactivity and increased levels of IgE antibodies in the sera of susceptible patients. These allergens were considered as the major allergens of sunflower pollen and were found to have their glycan moiety critical for inducing IgE response. Homology driven search of MS/MS data of these IgE-reactive proteins identified seven previously unreported allergens from sunflower pollen. Three major allergenic proteins were identified as two non-isoformic pectate lyases and a cystein protease. Conclusion: Novelty of the present report is the identification of a panel of seven sunflower pollen allergens for the first time at immuno-biochemical and proteomic level, which substantiated the clinical evidence of sunflower allergy. Further purification and recombinant expression of these allergens will improve component-resolved diagnosis and therapy of pollen allergy.

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