Open AccessThermal stability of peroxidase from the african oil palm tree Elaeis guineensis
Author(s) -
Rodríguez Anabel,
Pina David G.,
Yélamos Belén,
León John J. Castillo,
Zhadan Galina G.,
Villar Enrique,
Gavilanes Francisco,
Roig Manuel G.,
Sakharov Ivan Yu.,
Shnyrov Valery L.
Publication year - 2002
Publication title -
european journal of biochemistry
Language(s) - English
Resource type - Journals
eISSN - 1432-1033
pISSN - 0014-2956
DOI - 10.1046/j.1432-1033.2002.02930.x
Subject(s) - elaeis guineensis , arrhenius equation , palm oil , zymomonas mobilis , chemistry , peroxidase , differential scanning calorimetry , thermal stability , kinetic energy , analytical chemistry (journal) , thermodynamics , materials science , activation energy , enzyme , chromatography , biochemistry , organic chemistry , physics , food science , ethanol , ethanol fuel , quantum mechanics
The thermal stability of peroxidase from leaves of the African oil palm tree Elaeis guineensis (AOPTP) at pH 3.0 was studied by differential scanning calorimetry (DSC), intrinsic fluorescence, CD and enzymatic assays. The spectral parameters as monitored by ellipticity changes in the far‐UV CD spectrum of the enzyme as well as the increase in tryptophan intensity emission upon heating, together with changes in enzymatic activity with temperature were seen to be good complements to the highly sensitive but integral method of DSC. The data obtained in this investigation show that thermal denaturation of palm peroxidase is an irreversible process, under kinetic control, that can be satisfactorily described by the two‐state kinetic scheme, N D, 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. On the basis of this model, the parameters of the Arrhenius equation were calculated.