title: Melting-profile analysis of thermal stability of thermolysin. A formulation of temperature-scanning kinetics.
abstract: The melting-profile method consists of a continuous observation of a structural parameter while the temperature of the sample is raised at a constant rate [Fugita, S. C., & Imahori, K. (1974) IN Peptides, Polypeptides and Proteins (Blout, E. R., Bovey, F. A., Goodman, M., & Lotan, N., Eds.) p 217, Wiley, New York, N.Y.]. An analytical solution to the melting profile was formulated for the two-state irreversible process and called temperature-scanning kinetics. The theory was tested with thermolysin with consistent results, and the thermodynamic parameters of thermal denaturation were calculated: deltaH identical to = 80.3 kcal/mol, deltaS identical to = 153 eu. These values agreed with the corresponding values obtained from the classical constant-temperature relaxation kinetics. The possibilities of temperature-scanning kinetics are discussed.
mesh_terms: D002118:Calcium; D007700:Kinetics; D008433:Mathematics; D011487:Protein Conformation; D011489:Protein Denaturation; D013696:Temperature; D013816:Thermodynamics; D013820:Thermolysin / Q000378:metabolism
chemical_list: D013820:Thermolysin; D002118:Calcium