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Abstract
The activity and half-life of pectate lyase (PL) from Bacillus megaterium were nine- and 60-fold, respectively, higher at 90°C in the presence of hydroxyapatite nanoparticles (NP-PLs) than in the presence of 1mM CaCl2. Thermodynamic analysis of the nanoparticle-induced stability revealed an enhanced entropy–enthalpy compensation by the NP-PLs since a reciprocal linearity of the enthalpy–entropy change to 90°C was observed. Without nanoparticles, the linearity range was 70°C. Such compensation reflected the maintenance of the native structure of proteins. The remarkable enhancement of activity and stability of the NP-PL system at high temperatures may be utilized commercially e.g. in the food industry or the processing of natural fibers that may require a thermotolerant enzyme.
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