Bicarbonate-controlled reduction of oxygen by the QA semiquinone in Photosystem II in membranes [Biophysics and Computational Biology]

Photosystem II (PSII), the water/plastoquinone photo-oxidoreductase, plays a key energy input role in the biosphere. QA•−, the reduced semiquinone form of the nonexchangeable quinone, is often considered capable of a side reaction with O2, forming superoxide, but this reaction has not yet been demonstrated experimentally. Here, using chlorophyll fluorescence in...

Source: Proceedings of the National Academy of Sciences - February 3, 2022 Category: Science Authors: Andrea Fantuzzi, Friederike Allgower, Holly Baker, Gemma McGuire, Wee Kii Teh, Ana P. Gamiz–Hernandez, Ville R. I. Kaila, A. William Rutherford Tags: Biochemistry Biological Sciences Source Type: research