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. 1993 Aug;59(8):2666–2672. doi: 10.1128/aem.59.8.2666-2672.1993

Nonenzymatic Glycosylation of Lepidopteran-Active Bacillus thuringiensis Protein Crystals

Meenakshi Bhattacharya 1, Bradley A Plantz 1, Jane D Swanson-Kobler 1,†, Kenneth W Nickerson 1,*
PMCID: PMC182336  PMID: 16349021

Abstract

We used high-pH anion-exchange chromatography with pulsed amperometric detection to quantify the monosaccharides covalently attached to Bacillus thuringiensis HD-1 (Dipel) crystals. The crystals contained 0.54% sugars, including, in decreasing order of prevalence, glucose, fucose, arabinose/rhamnose, galactose, galactosamine, glucosamine, xylose, and mannose. Three lines of evidence indicated that these sugars arose from nonenzymatic glycosylation: (i) the sugars could not be removed by N- or O-glycanases; (ii) the sugars attached were influenced both by the medium in which the bacteria had been grown and by the time at which the crystals were harvested; and (iii) the chemical identity and stoichiometry of the sugars detected did not fit any known glycoprotein models. Thus, the sugars detected were the product of fermentation conditions rather than bacterial genetics. The implications of these findings are discussed in terms of crystal chemistry, fermentation technology, and the efficacy of B. thuringiensis as a microbial insecticide.

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Selected References

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