Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 44, Issue 4, Pages 326-332Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2009.01.004
Keywords
Palm peroxidase; Protein stability; Differential scanning calorimetry; Circular dichroism; Fluorescence
Funding
- Junta de Castilla y Leon [SA-06-00-0 ITACYL-Universidad de Salamanca, SA 129A07]
- Ministerio de Educacion y Ciencia [BFU2004-01432, BFU2007-68107-C02-02/BMC]
- Junta de Castilla y Leon, Spain [EDU/1490/2003]
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The structural stability of a peroxidase, a dimeric protein from palm tree Chamaerops excelsa leaves (CEP), has been characterized by high-sensitivity differential scanning calorimetry, circular dichroism and steady-state tryptophan fluorescence at pH 3. The thermally induced denaturation of CEP at this pH value is irreversible and strongly dependent upon the scan rate, suggesting that this process is under kinetic control. Moreover, thermally induced transitions at this pH value are dependent on the protein concentration, leading to the conclusion that in solution CEP behaves as dimer, which undergoes thermal denaturation coupled with dissociation. Analysis of the kinetic parameters of CEP denaturation at pH 3 was accomplished on the basis of the simple kinetic scheme N -> D-k, where k is a first-order kinetic constant that changes with temperature, as given by the Arrhenius equation; N is the native state, and D is the denatured state, and thermodynamic information was obtained by extrapolation of the kinetic transition parameters to an infinite heating rate. (C) 2009 Elsevier B.V. All rights reserved.
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