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Project C6

Protonation depending photochemistry in rhodopsin and phytochrome photoreceptor

Principal Investigator: Prof. Dr. Igor Schapiro (HUJI)

The goal of this project is derive a molecular-level understanding of how excitation effects protonation dynamics in retinal proteins and phytochromes. Both of these photoreceptor proteins engage double-bond photoisomerization as a common activation mechanism that leads to altered molecular interactions and proton transfer. To this end we will use hybrid quantum mechanics/molecular mechanics methods to simulate static spectra as well as dynamics. We will focus on the retinal proteins Channelrhodopsin, the sodium pump KR2 and the chloride pump NmHR as well as the phytochromes Agp1, Agp2 and Cph1.

Publications

2017-2020 (as Mercator Fellow)

Battocchio G., González R., Rao A.G., Schapiro I., Mroginski M.A. (2020). Dynamic Properties of the Photosensory Domain of Deinococcus radiodurans Bacteriophytochrome. J. Phys. Chem. B 124, 1740–1750; doi: 10.1021/acs.jpcb.0c00612

Borin V., Wiebeler C., Schapiro I. (2018). A QM/MM study of the initial excited state dynamics of greenabsorbing proteorhodopsin. Faraday Discuss. 207, 137–152; doi: 10.1039/C7FD00198C

Ehrenberg, D., Krause, N., Saita, M., Bamann, C., Kar, R.K., Hoffmann, K., Heinrich, D., Schapiro, I.Heberle, J., and Schlesinger, R. (2019) Atomistic insight into the role of threonine 127 in the functional mechanism of channelrhodopsin-2. Appl. Sci., 9 (22), 4905; https://doi.org/10.3390/app9224905.

Guo, Y., Wolff, F. E., Schapiro, I., Elstner, M., Marazzi, M. (2018). Different hydrogen bonding environments of the retinal protonated Schiff base control the photoisomerization in channelrhodopsin-2. Phys Chem Chem Phys 20, 27501-27509, doi: 10.1039/c8cp05210g.

Kaufmann, J.C.D., Krause B.S., Adam S., Ritter E., Schapiro I., Hegemann P. and Bartl F.J. (2020). Modulation of Light Energy Transfer from Chromophore to Protein in the Channelrhodopsin ReaChR. Biophysical Journal; doi: 10.1016/j.bpj.2020.06.031

Kraskov A., Nguyen A. D., Goerling J., Buhrke D., Velazquez F., Fernandez M., Michael N., Sauthof L. Schmidt A., Piwowarski P., Yang Y., Stensitzki T., Adam S., Bartl F., Schapiro I., Heyne K., Siebert F., Scheerer P., Mroginski M.A, and Hildebrandt P. (2020). Intramolecular Proton Transfer Controls Protein Structural Changes in Phytochrome. Biochemistry 59, 1023–1037; doi: 10.1021/acs.biochem.0c00053

Nogly, P., Weinert, T., James, D., Carbajo, S., Ozerov, D., Furrer, A., Gashi, D., Borin, V., Skopintsev, P., Jaeger, K., Nass, K., Bath, P., Bosman, R., Koglin, J., Seaberg, M., Lane, T., Kekilli, D., Brunle, S., Tanaka, T., Wu, W., Milne, C., White, T., Barty, A., Weierstall, U., Panneels, V., Nango, E., Iwata, S., Hunter, M., Schapiro, I., Schertler, G., Neutze, R., and Standfuss, J. (2018). Retinal isomerization in bacteriorhodopsin captured by a femtosecond x-ray laser. Science 361, 6398; doi: 10.1126/science.aat0094

Schnedermann, C., Yang, X., Liebel, M., Spillane, K. M., Lugtenburg, J., Fernandez, I., Valentini, A., Schapiro, I., Olivucci, M., Kukura, P., Mathies, R. A. (2018). Evidence for a vibrational phase isotope effect on the photochemistry of vision. Nature Chemistry, 2018, 10, 449-455, doi: 10.1038/s41557-018-0014-y.

Skopintsev, P., Ehrenberg, D., Weinert, T., James, D., Kar, R. K., Johnson, P. J. M., Ozerov, D., Furrer, A., Martiel, I., Dworkowski, F., Nass, K., Knopp, G., Cirelli, C., Arrell, C., Gashi, D., Mous, S., Wranik, M., Gruhl, T., Kekilli, D., Brünle, S., Deupi, X., Schertler, G. F. X., Benoit, R. M., Panneels, V., Nogly, P., Schapiro, I., Milne, C., Heberle, J., and Standfuss, J. (2020). Femtosecond-to-millisecond structural changes in a light-driven sodium pump. Nature. doi: 10.1038/s41586-020-2307-8

Stensitzki, T., Adam, S., Schlesinger, R., Schapiro, I., and Heyne, K. (2020) Ultrafast Backbone Protonation in Channelrhodopsin-1 Captured by Polarization Resolved Fs Vis-pump-IR-Probe Spectroscopy and Computational Methods. Molecules 25, 848; doi: 10.3390/molecules25040848

Wiebeler, Ch., Rao, A. G., Gärtner, W., and Schapiro, I. (2018). The Effective Conjugation Length is Responsible for the Red/Green Spectral Tuning in the Cyanobacteriochrome Slr1393g3. Angewandte Chemie 58(7), 1934-1938, doi: org/10.1002/anie.201810266.

Wiebeler C., Schapiro I. (2019). QM/MM Benchmarking of Cyanobacteriochrome Slr1393g3 Absorption Spectra. Molecules 24, 1720; doi: 10.3390/molecules24091720

Xu, X., Port, A., Wiebeler, Ch., Kai-Hong Zhao, K.-H., Schapiro, I., and Gärtner, W. (2020). Structural elements regulating the photochromicity in a cyanobacteriochrome. PNAS117 (5)2432-2440, doi: 10.1073/pnas.1910208117.