Allergy Asthma Immunol Res.  2015 May;7(3):283-289. 10.4168/aair.2015.7.3.283.

Allergenic Characterization of a Novel Allergen, Homologous to Chymotrypsin, from German Cockroach

  • 1Department of Internal Medicine, Institute of Allergy, Yonsei University College of Medicine, Seoul, Korea.


Cockroach feces are known to be rich in IgE-reactive components. Various protease allergens were identified by proteomic analysis of German cockroach fecal extract in a previous study. In this study, we characterized a novel allergen, a chymotrypsin-like serine protease.
A cDNA sequence homologous to chymotrypsin was obtained by analysis of German cockroach expressed sequence tag (EST) clones. The recombinant chymotrypsins from the German cockroach and house dust mite (Der f 6) were expressed in Escherichia coli using the pEXP5NT/TOPO vector system, and their allergenicity was investigated by ELISA.
The deduced amino acid sequence of German cockroach chymotrypsin showed 32.7 to 43.1% identity with mite group 3 (trypsin) and group 6 (chymotrypsin) allergens. Sera from 8 of 28 German cockroach allergy subjects (28.6%) showed IgE binding to the recombinant protein. IgE binding to the recombinant cockroach chymotrypsin was inhibited by house dust mite chymotrypsin Der f 6, while it minimally inhibited the German cockroach whole body extract.
A novel allergen homologous to chymotrypsin was identified from the German cockroach and was cross-reactive with Der f 6.


Allergens; chymotrypsin; German cockroach
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