TY - JOUR
T1 - Thermodynamics of the S2-To-S3 state transition of the oxygen-evolving complex of photosystem II
AU - Amin, Muhamed
AU - Kaur, Divya
AU - Yang, Ke R.
AU - Wang, Jimin
AU - Mohamed, Zainab
AU - Brudvig, Gary W.
AU - Gunner, M. R.
AU - Batista, Victor
N1 - Funding Information:
The authors acknowledge computational resources from NERSC (V. S. B.) and support by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences via Grants DESC0001423 (M. R. G. and V. S. B.), DE-FG02-05ER15646 (G. W. B.) and from the European Research Council through the Consolidator Grant COMOTION (ERC-Küpper-614507).
Publisher Copyright:
© the Owner Societies.
PY - 2019
Y1 - 2019
N2 - The room temperature pump-probe X-ray free electron laser (XFEL) measurements used for serial femtosecond crystallography provide remarkable information about the structures of the catalytic (S-state) intermediates of the oxygen-evolution reaction of photosystem II. However, mixed populations of these intermediates and moderate resolution limit the interpretation of the data from current experiments. The S3 XFEL structures show extra density near the OEC that may correspond to a water/hydroxide molecule. However, in the latest structure, this additional oxygen is 2.08 Å from the Oϵ2 of D1-E189, which is closer than the sum of the van der Waals radii of the two oxygens. Here, we use Boltzmann statistics and Monte Carlo sampling to provide a model for the S2-To-S3 state transition, allowing structural changes and the insertion of an additional water/hydroxide. Based on our model, water/hydroxide addition to the oxygen-evolving complex (OEC) is not thermodynamically favorable in the S2g = 2 state, but it is in the S2g = 4.1 redox isomer. Thus, formation of the S3 state starts by a transition from the S2g = 2 to the S2g = 4.1 structure. Then, electrostatic interactions support protonation of D1-H190 and deprotonation of the Ca2+-ligated water (W3) with proton loss to the lumen. The W3 hydroxide moves toward Mn4, completing the coordination shell of Mn4 and favoring its oxidation to Mn(iv) in the S3 state. In addition, binding an additional hydroxide to Mn1 leads to a conformational change of D1-E189 in the S2g = 4.1 and S3 structures. In the S3 state a fraction of D1-E189 release from Mn1 and bind a proton.
AB - The room temperature pump-probe X-ray free electron laser (XFEL) measurements used for serial femtosecond crystallography provide remarkable information about the structures of the catalytic (S-state) intermediates of the oxygen-evolution reaction of photosystem II. However, mixed populations of these intermediates and moderate resolution limit the interpretation of the data from current experiments. The S3 XFEL structures show extra density near the OEC that may correspond to a water/hydroxide molecule. However, in the latest structure, this additional oxygen is 2.08 Å from the Oϵ2 of D1-E189, which is closer than the sum of the van der Waals radii of the two oxygens. Here, we use Boltzmann statistics and Monte Carlo sampling to provide a model for the S2-To-S3 state transition, allowing structural changes and the insertion of an additional water/hydroxide. Based on our model, water/hydroxide addition to the oxygen-evolving complex (OEC) is not thermodynamically favorable in the S2g = 2 state, but it is in the S2g = 4.1 redox isomer. Thus, formation of the S3 state starts by a transition from the S2g = 2 to the S2g = 4.1 structure. Then, electrostatic interactions support protonation of D1-H190 and deprotonation of the Ca2+-ligated water (W3) with proton loss to the lumen. The W3 hydroxide moves toward Mn4, completing the coordination shell of Mn4 and favoring its oxidation to Mn(iv) in the S3 state. In addition, binding an additional hydroxide to Mn1 leads to a conformational change of D1-E189 in the S2g = 4.1 and S3 structures. In the S3 state a fraction of D1-E189 release from Mn1 and bind a proton.
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U2 - 10.1039/c9cp02308a
DO - 10.1039/c9cp02308a
M3 - Article
C2 - 31517382
AN - SCOPUS:85072628417
VL - 21
SP - 20840
EP - 20848
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 37
ER -