Project C4

Coupling between protein, water, and protonation dynamics in channelrhodopsin-2 and photosystem II

Principal Investigator: Prof. Dr. Ana-Nicoleta Bondar (FU)

Functionally crucial processes in channelrhodopsin-2 (ChR2) and photosystem II (PSII) involve changes in the protonation states of specific amino acid residues of the protein. The key open question of how changes in protonation couple with both protein conformational dynamics and water dynamics is addressed in C4. Theoretical biophysics techniques are used to study the dynamics of ChR2 and PSII in hydrated lipid membrane environments, probe the response of protein and water dynamics to changes in protonation or mutations, dissect hydrogen-bonded networks and compute proton-transfer pathways.

Publications 2014 - 2016

Bommer, M., Bondar, A.-N., Zouni, A., Dobbek, H., and Dau, H. (2016). Crystallographic and computational analysis of the barrel part of the PsbO protein of photosystem II - carboxylate-water clusters as putative proton transfer relays and structural switches. Biochemistry 55, 4626-4635.

del Val, C., Bondar, L., and Bondar, A.-N. (2014). Coupling between inter-helical hydrogen bonding and water dynamics in a proton transporter. Journal of Structural Biology 186, 95-111.

del Val, C., Royuela-Flor, J., Milenkovic, S., and Bondar, A.-N. (2014). Channelrhodopsins: A bioinformatics perspective. Biochimica et Biophysica Acta (BBA) - Bioenergetics 1837, 643-655.

Guerra, F., Adam, S., and Bondar, A.-N. (2015). Revised force-field parameters for chlorophyll-a, pheophytin-a and plastoquinone-9. Journal of Molecular Graphics & Modelling 58, 30-39.

Guerra, F., and Bondar, A.-N. (2015). Dynamics of the Plasma Membrane Proton Pump. Journal of Membrane Biology 248, 443-453.

Karge, O., Bondar, A.-N., and Dau, H. (2014). Cationic screening of charged surface groups (carboxylates) affects electron transfer steps in photosystem-II water oxidation and quinone reduction. Biochimica et Biophysica Acta (BBA) - Bioenergetics 1837, 1625-1634.

Lorch, S., Capponi, S., Pieront, F., and Bondar, A.-N. (2015). Dynamic Carboxylate/Water Networks on the Surface of the PsbO Subunit of Photosystem II. Journal of Physical Chemistry B 119, 12172-12181.

Sugihara, M., Suwa, M., and Bondar, A.-N. (2014). Dynamics of bovine opsin bound to G-protein fragments. Journal of Structural Biology 188, 79-86