O2 and Other High-Energy Molecules in Photosynthesis: Why Plants Need Two Photosystems.

ABSTRACT: The energetics of photosynthesis in plants have been re-analyzed in a framework that represents the relatively high energy of O2 correctly. Starting with the photon energy exciting P680 and "loosening an electron", the energy transfer and electron transport are represented in a comprehensive, self-explanatory sequence of redox energy transfer and release diagrams. The resulting expanded Z-scheme explicitly shows charge separation as well as important high-energy species such as O2, TyrZ˙, and P680+˙, whose energies are not apparent in the classical Z-scheme of photosynthesis. Crucially, the energetics of the three important forms of P680 and of P700 are clarified. The relative free energies of oxidized and reduced species are shown explicitly in kJ/mol, not encrypted in volts. Of the chemi

SUBMITTER: Schmidt-Rohr K 

PROVIDER: S-EPMC8621363 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature