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標題: Identification of the antigenic determinants of the American cockroach allergen Per a 1 by error-prone PCR
作者: Tsai, W.J.
Liu, C.H.
Chen, S.T.
Yang, C.Y.
關鍵字: American cockroach;allergen;epitope mapping;error-prone PCR;grass-pollen allergen;t-cell epitopes;cross-reactive allergens;ige;antibody-responses;group-i allergens;der-p-i;monoclonal-antibodies;periplaneta-americana;blattella-germanica;random mutagenesis
Project: Journal of Immunological Methods
期刊/報告no:: Journal of Immunological Methods, Volume 276, Issue 1-2, Page(s) 163-174.
The group I allergen of cockroach is found in both American and German cockroaches, designated as Per a 1 and Bla g 1, respectively. Members of these allergens so far identified are composed of tandem repeats that may cause the high allergenicity of Per a I allergen. In this study, we used monoclonal antibodies HW-8 and HW-19, which can inhibit the binding of patient IgE to Per a 1 allergen, to define the structure of the antigenic determinants in Per a 1.0103 (designated 0), an isoallergen of Per a I allergen. Two recognition sites are present, one in the N-terminus (aa 1-208) and the other in the C-terminus (aa 208-395). The N-terminal epitope is not accessible to antibody molecules on the pET-expressed C3 protein. The C-terminal epitope was further localized to the aa 267-354 region (C3E) by colony immunoscreening of the cDNA epitope library. By negative screening of the mutated C3E expression library generated by error-prone PCR (ER-PCR), an approach which has rarely been applied in epitope mapping, the functional epitope was identified to lie in aa 318-337 with aa 323-331 being the core motif. The minimal region of the functional epitope was further delineated, by sequence alignment, to be D-x-[I, L]-A-[I, L]-L-P-V-DE-[L, I]-x-A-[L, I], where x represents any amino acids. This motif is found in all Per a I allergens and may serve as a basis for designing a peptide vaccine for allergen-specific immunotherapy. To our knowledge, this is the first report for (1) detailed mapping of the cockroach allergens and (2) use of error-prone PCR random mutagenesis and negative selection in molecular allergology. (C) 2003 Elsevier Science B.V All rights reserved.
ISSN: 0022-1759
DOI: 10.1016/s0022-1759(03)00105-4
Appears in Collections:分子生物學研究所

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