Gibberellin-regulated proteins: Emergent allergens

Area of Science:

• Food allergy research
• Plant biochemistry
• Immunology

Background:

• Gibberellin-regulated proteins (GRPs) are a recently identified family of allergenic proteins.
• GRPs share characteristics with lipid transfer proteins (LTPs), including heat and proteolytic resistance.
• Potential increased exposure to GRPs may be linked to elevated gibberellin levels in food.

Purpose of the Study:

• To review the characteristics and known sources of GRP allergens.
• To explore potential reasons for GRP allergenicity and cross-reactivity.
• To highlight the clinical relevance and structural features of GRPs.

Main Methods:

• Literature review of GRP allergens in various plant sources and pollens.
• Analysis of sequence identities and structural predictions (three-dimensional models) of GRPs.
• Discussion of IgE cross-reactivities and clinical implications.

Main Results:

• GRP allergens identified in peach, apricot, cherry, orange, pomegranate, bell pepper, strawberry, and Cupressaceae pollens.
• Significant sequence identities (60-95%) exist among GRP allergens.
• IgE cross-reactivities between GRPs may explain syndromes like peach/cypress and citrus/cypress.

Conclusions:

• GRPs are clinically significant allergens, capable of causing severe reactions.
• Structural features, including predicted epitopic regions, are important for GRP allergenicity.
• Further research is needed to understand why only certain GRPs sensitize patients, considering their ubiquity and structural properties.