NDLI: Conformational Flexibility of Lipase Lip1 from Candida Rugosa Studied by Electronic Spectroscopies and Thermodynamic Approaches

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Conformational Flexibility of Lipase Lip1 from Candida Rugosa Studied by Electronic Spectroscopies and Thermodynamic Approaches

Content Provider	Springer Nature Link
Author	Fuciños González, J. P. Bassani, G. Farruggia, B. Picó, G. A. Pastrana Castro, L. Rua, M. L.
Copyright Year	2011
Abstract	We have used second-order orthogonal designs to obtain empirical models that describe the combined effect of pH and temperature on the secondary structure of a lipase (Lip1) from Candida rusosa. The equations that describe lipase conformational flexibility were derivated from the enzyme alpha helix fraction obtained from the experimental matrix. The thermal unfolding of lipase at different pH values was followed by measuring the circular dichroism signal as a function of temperature over a temperature range of 20–80 °C. The results showed a melting temperature of 58.9 °C at pH 5.5, while at pHs 7.0 and 8.6, the temperature values were 50.2 °C and 36.1 °C respectively. The optimum experimental conditions of conformations with high content of alpha helix were found at high temperature and pH, both at zero time and at one-hour incubation time of enzyme. Important variations in the enzyme secondary structure were induced for the pH and temperature. In contrast, minor changes were observed during the incubation time. This behaviour suggests that the medium pH induces a modification in the enzyme secondary structure and not due to a result of a progressive denaturation process. From the values of thermodynamic functions at different pHs, the system at initial state of unfolding process is previously disordered by the pH effect.
Starting Page	77
Ending Page	83
Page Count	7
File Format	PDF
ISSN	15723887
Journal	The Protein Journal
Volume Number	30
Issue Number	2
e-ISSN	15734943
Language	English
Publisher	Springer US
Publisher Date	2011-02-13
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lipase Candida rugosa Conformational flexibility Organic Chemistry Animal Anatomy / Morphology / Histology Bioorganic Chemistry Biochemistry
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Analytical Chemistry Biochemistry Bioengineering

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