Author(s)

Heather N. H. Wilks, Tara M. Arrington, Billy Mark Britt

Department of Chemistry and Biochemistry, Texas Woman’s University, Denton, Texas, USA.

A partial phase diagram characterizing the conformational change that occurs in Thermomyces lanuginosus xylanase as it is slowly heated in 150 mM sodium phosphate (pH = 7.0) has been con-structed from slow-scan-rate differential scanning calorimetry measurements. The Clausius-Clapeyron equation was applied to determine an associated volume change of -205 L·mol^-1 at 24°C, the equilibrium transition temperature at 1.0 atm pressure. This value is in excellent agreement with that predicted using a previously published [1] empirical equation for calculating the hydro-dynamic radius if the transition is regarded as from a random coil to a functional, folded state and with the assumption that the hydrodynamic radius is a good approximation of the true random coil radius. The existence of a low-temperature random coil is confirmed by circular dichroism and dynamic light scattering measurements. Thus, at 24°C and 1.0 atm pressure the enzyme appears to fold from a random coil to a functional, folded form as it is slowly heated.

Clausius-Clapeyron, Conformational Change, Slow-Scan-Rate Differential Scanning Calorimetry, Thermomyces lanuginosus Xylanase, Volume Change

Wilks, H. , Arrington, T. and Britt, B. (2014) Volume Change of the Random Coil to Folded Conformational Transition of Thermomyces lanuginosus Xylanase at 24°C and pH = 7.0 via Application of the Clausius-Clapeyron Equation. Journal of Biophysical Chemistry, 5, 134-142. doi: 10.4236/jbpc.2014.54015.