Trehalose matrix effects on electron transfer in Mn-depleted protein-pigment complexes of Photosystem II.

Mahir D Mamedov, Georgy E Milanovsky, Marco Malferrari, Liya A Vitukhnovskaya, Francesco Francia, Alexey Yu Semenov, Giovanni Venturoli

Biochimica et biophysica acta. Bioenergetics 2021 Jul 01

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The kinetics of flash-induced re-reduction of the Photosystem II (PS II) primary electron donor P680 was studied in solution and in trehalose glassy matrices at different relative humidity. In solution, and in the re-dissolved glass, kinetics were dominated by two fast components with lifetimes in the range of 2-7 μs, which accounted for >85% of the decay. These components were ascribed to the direct electron transfer from the redox-active tyrosine YZ to P680+. The minor slower components were due to charge recombination between the primary plastoquinone acceptor QA- and P680+. Incorporation of the PS II complex into the trehalose glassy matrix and its successive dehydration caused a progressive increase in the lifetime of all kinetic phases, accompanied by an increase of the amplitudes of the slower phases at the expense of the faster phases. At 63% relative humidity the fast components contribution dropped to ~50%. A further dehydration of the trehalose glass did not change the lifetimes and contribution of the kinetic components. This effect was ascribed to the decrease of conformational mobility of the protein domain between YZ and P680, which resulted in the inhibition of YZ → P680+ electron transfer in about half of the PS II population, wherein the recombination between QA- and P680+ occurred. The data indicate that PS II binds a larger number of water molecules as compared to PS I complexes. We conclude that our data disprove the "water replacement" hypothesis of trehalose matrix biopreservation. Copyright © 2021 Elsevier B.V. All rights reserved.

Citation

Mahir D Mamedov, Georgy E Milanovsky, Marco Malferrari, Liya A Vitukhnovskaya, Francesco Francia, Alexey Yu Semenov, Giovanni Venturoli. Trehalose matrix effects on electron transfer in Mn-depleted protein-pigment complexes of Photosystem II. Biochimica et biophysica acta. Bioenergetics. 2021 Jul 01;1862(7):148413