Remodeling of algal photosystem I through phosphorylation

Muhammad Younas; Martin Scholz; Giulia Maria Marchetti; Michael Hippler

doi:10.1042/BSR20220369

Remodeling of algal photosystem I through phosphorylation

Biosci Rep. 2023 Jan 31;43(1):BSR20220369. doi: 10.1042/BSR20220369.

Authors

Muhammad Younas¹, Martin Scholz¹, Giulia Maria Marchetti¹, Michael Hippler^{1

2}

Affiliations

¹ Institute of Plant Biology and Biotechnology, University of Münster, 48143 Münster, Germany.
² Institute of Plant Science and Resources, Okayama University, Kurashiki, Japan.

Abstract

Photosystem I (PSI) with its associated light-harvesting system is the most important generator of reducing power in photosynthesis. The PSI core complex is highly conserved, whereas peripheral subunits as well as light-harvesting proteins (LHCI) reveal a dynamic plasticity. Moreover, in green alga, PSI-LHCI complexes are found as monomers, dimers, and state transition complexes, where two LHCII trimers are associated. Herein, we show light-dependent phosphorylation of PSI subunits PsaG and PsaH as well as Lhca6. Potential consequences of the dynamic phosphorylation of PsaG and PsaH are structurally analyzed and discussed in regard to the formation of the monomeric, dimeric, and LHCII-associated PSI-LHCI complexes.

Keywords: Light harvesting proteins; green algae; phosphorylation/dephosphorylation; photosystems.

MeSH terms

Chlamydomonas reinhardtii* / metabolism
Light-Harvesting Protein Complexes / metabolism
Phosphorylation
Photosystem I Protein Complex* / metabolism
Thylakoids

Substances

Photosystem I Protein Complex
Light-Harvesting Protein Complexes