Epitope peptides of wheat gliadins and glutenins for atopic dermatitis, PQQPF and QQQPP, were degraded by the microbial proteases of Streptomyces griseus and Aspergillus oryzae. The proteases of Bacillus licheniformis and Bacillus amyloloiquefasiens degraded wheat gliadins and glutenins, but had little or no effect on the epitopes. A 16-mer peptide of CSQQQQPPFSQQQPPF, which incorporated this glutenin epitope twice, was also hydrolyzed by these proteases, and no peptide containing QQQPP was shown after the reaction with S. griseus protease. The proteases of S. griseus and A. oryzae also degraded epitope peptides of wheat gliadins and glutenins for exercise-induced anaphylaxis, QQIPQQQ, QQFPQQQ and QQPGQ.