Phage

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APPLIED AND ENVIRONMENTAL MICROBIOLOGY, Aug. 1999, p. 3279–3286 0099-2240/99/$04.00 0 Copyright © 1999, American Society for Microbiology. All Rights Reserved.

Vol. 65, No. 8

Identification of Mimotope Peptides Which Bind to the Mycotoxin Deoxynivalenol-Specific Monoclonal Antibody
QIAOPING YUAN,1† JAMES J. PESTKA,2 BRANDON M. HESPENHEIDE,3 LESLIE A. KUHN,3 JOHN E. LINZ,2 AND L. PATRICK HART1* Departments of Botany and Plant Pathology,1 Food Science and Human Nutrition,3 and Biochemistry,2 Michigan State University, East Lansing, Michigan 48824
Received 23 October 1998/Accepted 6 May 1999

Monoclonal antibody 6F5 (mAb 6F5), which recognizes the mycotoxin deoxynivalenol (DON) (vomitoxin), was used to select for peptides that mimic the mycotoxin by employing a library of filamentous phages that have random 7-mer peptides on their surfaces. Two phage clones selected from the random peptide phage-displayed library coded for the amino acid sequences SWGPFPF and SWGPLPF. These clones were designated DONPEP.2 and DONPEP.12, respectively. The results of a competitive enzyme-linked immunosorbent assay (ELISA) suggested that the two phage displayed peptides bound to mAb 6F5 specifically at the DON binding site. The amino acid sequence of DONPEP.2 plus a structurally flexible linker at the C terminus (SWGPFPFGGGSC) was synthesized and tested to determine its ability to bind to mAb 6F5. This synthetic peptide (designated peptide C430) and DON competed with each other for mAb 6F5 binding. When translationally fused with bacterial alkaline phosphatase, DONPEP.2 bound specifically to mAb 6F5, while the fusion protein retained alkaline phosphatase activity. The potential of using DONPEP.2 as an immunochemical reagent in a DON immunoassay was evaluated with a DON-spiked wheat extract. When peptide C430 was conjugated to bovine serum albumin, it elicited antibody specific to peptide C430 but not to DON in both mice and rabbits. In an in vitro translation system containing rabbit

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