Journal of Protein Chemistry

, Volume 9, Issue 1, pp 87–94 | Cite as

Secondary structure of the entomocidal toxin fromBacillus thuringiensis subsp.kurstaki HD-73

  • Christin T. Choma
  • Witold K. Surewicz
  • Paul R. Carey
  • Marianne Pozsgay
  • Harvey Kaplan


The secondary structure of the toxin fromBacillus thuringiensis subsp.kurstaki (Btk) HD-73 was estimated by Raman, infrared, and circular dichroism spectroscopy, and by predictive methods. Circular dichroism and infrared spectroscopy gave an estimate of 33–40% α-helix, whereas Raman and predictive methods gave approximately 20%. Raman and circular dichroism spectra, as well as predictive methods, indicated that the toxin contains 32–40% β-sheet structure, whereas infrared spectroscopy gave a slightly lower estimate. Thus, all of these approaches are in agreement that the native conformation of Btk HD-73 toxin is highly folded and contains considerable amounts of both α-helical and β-sheet structures. No significant differences were detected in the secondary structure of the toxin either in solution or as a hydrated pellet.

Key words

Bacillus thuringiensis toxin secondary structure 


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Copyright information

© Plenum Publishing Corporation 1990

Authors and Affiliations

  • Christin T. Choma
    • 1
  • Witold K. Surewicz
    • 2
  • Paul R. Carey
    • 3
  • Marianne Pozsgay
    • 3
  • Harvey Kaplan
    • 1
  1. 1.Department of ChemistryUniversity of OttawaOttawaCanada
  2. 2.Division of ChemistryNational Research Council of CanadaOttawaCanada
  3. 3.Division of Biological SciencesNational Research Council of CanadaOttawaCanada

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