5/19/2023 0 Comments Spss 26 license code freeIn recent years, high-resolution structures of the PSI–LHCI–LHCII supercomplex from plants and green algae were reported. The process is reversible, as LHCII is dephosphorylated and returns to PSII under the preferential excitation of PSI. ![]() The preferential excitation of PSII (state 2) results in the activation of a chloroplast kinase which in turn phosphorylates LHCII, a process followed by the release of phosphorylated LHCII from PSII and its migration to PSI, thus forming the PSI–LHCI–LHCII supercomplex. State transitions represent a short-term light adaptation mechanism for balancing the energy distribution between the two photosystems by relocating light-harvesting complex II (LHCII) proteins. In order to maintain optimal photosynthetic activity under a constantly changing natural light environment, plants and green algae regulate the absorbed photo-excitation energy between PSI and PSII through processes known as state transitions. Both photosystems associate with antennae complexes whose main function is to increase the light-harvesting capability of the core. The primary reactions of photosynthesis are catalyzed by the photosystem II (PSII) and photosystem I (PSI) complexes. Photosynthesis constitutes the only known natural process that captures the solar energy to convert carbon dioxide and water into biomass.
0 Comments
Leave a Reply. |