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Comparative Two-Dimensional Fourier Transform Infrared Correlation Spectroscopic Study on the Spontaneous, Pressure-, and Temperature-Enhanced H/D Exchange in -Lactalbumin

Volume 54, Number 7 (July 2000) Page 963-967

Dzwolak, Wojciech; Kato, Minoru; Shimizu, Akio; Taniguchi, Yoshihiro

Two-dimensional Fourier transform infrared FT-IR was applied for the examination of the H/D exchange process in D2O solutions of bovine α-lactalbumin. The slow spontaneous H/D exchange at 25 °C was compared with pressure-enhanced and temperature-enhanced H/D exchange. The H/D-exchange process, which takes 48 h at 25 °C and under atmospheric pressure, is completed within 3 h when pressure is gradually elevated up to 180 MPa, or when temperature is increased up to 42.5 °C. Although the slow room-temperature H/D exchange and the fast pressure or temperature-enhanced H/D exchange feature a high degree of similarity between the corresponding second-derivative spectra, the two-dimensional (2D) FT-IR correlation maps revealed that upon the heat treatment the order in which the H/D exchange takes place in the structural domains of α-lactalbumin is altered. It has been observed that these differences can be explained in light of the known properties of α-lactalbumin and the crystallographic data.