Energetics of cyclodextrin-induced dissociation of insulin

Lovatt, M., Cooper, A. and Camilleri, P. (1996) Energetics of cyclodextrin-induced dissociation of insulin. European Biophysics Journal with Biophysics Letters, 24(5), pp. 354-357.

Abstract

The energetics of dissociation of bovine insulin in aqueous solution have been investigated by sensitive dilution microcalorimetry. Cyclodextrins increase dissociation of insulin oligomers in a manner consistent with their interaction with protein side chains. For example, assuming monomer-dimer equilibrium, in the absence of cycle dextrins the calorimetric dilution data (25 degrees C, pH 2.5) indicate a dimer dissociation constant (K-diss) of about 12 mu M and an endothermic dissociation enthalpy (Delta H-diss) of +41 kJ mol(-1). Addition of methyl-beta-cyclodextrin (up to 200 mM) makes dissociation significantly more endothermic (Delta H-diss = 79 kJ mol(-1)) and reduces the apparent dimer dissociation constant by more than two orders of magnitude (K(diss)approximate to 1.7 mM). Qualitatively similar results are observed with alpha-cyclodextrin and other beta- cyclodextrin derivatives. Cyclodextrin-induced insulin dissociation is also observed at pH 7.4.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Cooper, Professor Alan
• Authors: Lovatt, M., Cooper, A., and Camilleri, P.
• Subjects: Q Science > QL Zoology; Q Science > QH Natural history > QH345 Biochemistry
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: European Biophysics Journal with Biophysics Letters
• ISSN: 0175-7571