Abstract
Mid-infrared free-electron laser (MIR-FEL) is potentially applicable for tissue ablation and dissociation of pathological peptide aggregates in medicine. However, it is still poorly understood how the MIR-FEL irradiation influences on functional proteins such as enzymes. In the current study, the effect of MIR-FEL on both aggregate and non-aggregate (= native) states of hen egg-white lysozyme (HEWL) as a representative enzyme has been investigated. Absorption intensity at terahertz region (0.3–1.2 THz, 10–40 cm−1) of the aggregate of HEWL was lower than that of the native HEWL, but the former was increased nearly to the same level with the latter after the MIR-FEL irradiation tuned to 6 μm that corresponds to carbonyl stretching vibrational mode of amide bonds (amide I). This indicates that the aggregate of HEWL was converted to the native state by the irradiation. On the other hand, synchrotron-radiation vacuum-ultraviolet circular-dichroism spectroscopy showed that protein conformation of the native HEWL, which was rich in α-helix, was little changed after the MIR-FEL irradiation under the same condition with the case of the aggregate of HEWL. Furthermore, the enzymatic hydrolysis activity of the native HEWL against bacterial glycan was not remarkably decreased by the irradiation. Therefore, it can be estimated that the native structure of HEWL is little damaged although the aggregate state can be easily dissociated by the resonant excitation at amide bonds.
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Acknowledgments
We are grateful to the staff of the IR-FEL Research Center at Tokyo University of Science for providing the beam time. This work was supported in part by the Open Advanced Research Facilities Initiative and Photon Beam Platform Project of the Ministry of Education, Culture, Sports, Science and Technology of Japan, and the collaborative research project of the Research Center for Development of the Far-Infrared Region, University of Fukui, in the fiscal year 2016 (subject number: H28FIRDM029A). VUV-CD spectroscopy was carried out with the approval of the Hiroshima Synchrotron Radiation Center of Hiroshima University (proposal number: 17AU009).
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Kawasaki, T., Izumi, Y., Ohori, G. et al. Study on Irradiation Effect of Mid-Infrared Free Electron Laser on Hen Egg-White Lysozyme by Using Terahertz-Time Domain Spectroscopy and Synchrotron-Radiation Vacuum-Ultraviolet Circular-Dichroism Spectroscopy. J Infrared Milli Terahz Waves 40, 998–1009 (2019). https://doi.org/10.1007/s10762-019-00626-9
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DOI: https://doi.org/10.1007/s10762-019-00626-9