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Updated: Dec 30, 2025

Measuring Enzymatic Stability by Isothermal Titration Calorimetry
Published on: March 26, 2019
Stability/activity tradeoffs in Thermusthermophilus HB27 laccase
Jieun Shin1, Harry B Gray1, Jay R Winkler2
1Beckman Institute, California Institute of Technology, Pasadena, CA, 91125, USA.
Abstract:
We report the temperature dependence of the formal potential of type 1 copper (CuT1) in Thermusthermophilus HB27 laccase. Employing [Ru(NH3)4(bpy)](PF6)2 (0.505 vs. NHE) as the redox titrant, we found that the CuT12+/+ potential decreased from approximately 480 to 420 mV (vs. NHE) as the temperature was raised from 20 to 65 °C. Of importance is that the ΔSrc° of - 120 J mol-1 K-1 is substantially more negative than those for other blue copper proteins. We suggest that the highly unfavorable reduction entropy is attributable to CuT1 inaccessibility to the aqueous medium. Although the active site residues are buried, which is critical for maintaining thermostability, the flexibility around CuT1 is maintained, allowing enzyme activity at ambient temperature.
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