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Several parts of the world regularly consume termites. Arthropod arginine kinase proteins often cross-react with human immunoblobulin E (IgE) antibodies and they are considered pan-allergens. The Formosan subterranean termite Coptotermes formosanus (C. formosanus (Shiraki) [Isoptera: Rhinotermitidae]), along with cockroaches, belong to the order Blattodea and they are common household pests in tropical and subtropical parts of the world. An sodium dodecyl sulfate–polyacrylamide gel electrophoresis (SDS-PAGE) band migrating at approximately 37 kDa in C. formosanus termite extracts cross-reacted with IgE from five cockroach allergic patient samples by immunoblot. Liquid chromatography-mass spectrometry analysis of gel slices from the corresponding region of a gel indicated several peptides from the excised region were identical to the American cockroach arginine kinase allergen, Per a 9. The sequence of the full-length C. formosanus arginine kinase gene indicates the protein it encodes is 96% identical to American cockroach Per a 9, 94% identical to German cockroach Bla g 9, and 82–84% identical to shrimp arginine kinase proteins Pen m 2, Lit v 2, and Cra c 2. Full-length C. formosanus arginine kinase was fused to a glutathione S-transferase tag and recombinantly expressed and purified from Escherichia coli by affinity chromatography. The recombinant protein was recognized by IgE from 11 of 12 cockroach or shrimp allergic samples, but did not cross-react with dust mite allergic or peanut/tree nut allergic samples. The results of this study indicate the C. formosanus arginine kinase cross-reacts with cockroach and shrimp allergic IgE, and if consumed would likely act as an allergen.

Cloning, Expression, and Immunological Characterization of Formosan Subterranean Termite (Blattodea: Rhinotermitidae) Arginine Kinase