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. 1993 Jun;59(6):1821–1827. doi: 10.1128/aem.59.6.1821-1827.1993

Biotinylation of Bacillus thuringiensis Insecticidal Crystal Proteins

P Denolf 1,*, S Jansens 1, S Van Houdt 1, M Peferoen 1, D Degheele 1, J Van Rie 1
PMCID: PMC182167  PMID: 16348959

Abstract

Biotinylation of Bacillus thuringiensis insecticidal crystal proteins (ICPs) was evaluated for its potential use in an alternative ICP screening method and in the characterization of ICP receptors. In vivo biological activity of CryIA(b), as inferred from bioassays with Manduca sexta and Ostrinia nubilalis and from histopathological effects on O. nubilalis midgut cells induced by force feeding, was not affected by biotinylation at moderate biotinylation ratios. A competitive radioreceptor assay showed that there was only a minor reduction in binding affinity of biotin-labeled CryIA(b) for M. sexta brush border membrane vesicles. On midgut tissue sections, the binding pattern along the midgut epithelium and the staining intensity of biotinylated ICPs detected with streptavidin-enzyme conjugate were virtually identical to the binding pattern and staining intensity of native CryIA(b) detected with antibodies. The specificity of biotinylated ICP binding to larval midgut tissue was demonstrated by performing homologous competition experiments. The relationship between different ICP receptor types in Plutella xylostella, as inferred from radioligand binding studies, was confirmed by the results of heterologous competition experiments performed with biotinylated and native ICPs.

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Selected References

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