Searching for allergens in maize kernels via proteomic tools.

Area of Science:

• Food allergy research
• Plant biochemistry
• Immunology

Background:

• Only one major maize allergen was previously identified.
• Maize (Zea mays) allergy is a significant concern.
• Limited knowledge exists regarding the full spectrum of maize allergens.

Purpose of the Study:

• To identify novel allergens in maize kernel flour.
• To expand the understanding of protein allergens in maize.
• To investigate the allergenicity of specific maize protein fractions.

Main Methods:

• Two-dimensional gel electrophoresis of maize kernel flour proteins.
• Protein transfer to nitrocellulose membranes for immunoblotting.
• Serum confrontation with patient allergic to maize proteins.
• Spot excision followed by Orbitrap mass spectrometry for protein identification.

Main Results:

• Six new maize allergens identified: vicilin, globulin-2, 50 kDa gamma-zein, endo-chitinase, thioredoxin, and trypsin inhibitor.
• Vicilin and globulin-2 were found to be allergenic across multiple protein spots.
• Homology analysis revealed similarities between maize allergens and proteins in rice, wheat, and barley.

Conclusions:

• This study significantly expands the repertoire of known maize allergens.
• New allergens identified contribute to a better understanding of maize sensitization.
• Findings provide a basis for improved diagnostics and management of maize allergy.