Light-dependent phosphorylation of THRUMIN1 regulates its association with actin filaments and 14-3-3 proteins.

ABSTRACT: Light-dependent chloroplast movements in leaf cells contribute to the optimization of photosynthesis. Low-light conditions induce chloroplast accumulation along periclinal cell surfaces, providing greater access to available light, whereas high light induces movement of chloroplasts to anticlinal cell surfaces, providing photodamage protection and allowing more light to reach underlying cell layers. The THRUMIN1 protein is required for normal chloroplast movements in Arabidopsis (Arabidopsis thaliana) and has been shown to localize at the plasma membrane and to undergo rapid light-dependent interactions with actin filaments through the N-terminal intrinsically disordered region (IDR). A predicted WASP-Homology 2 domain was found in the IDR but mutations in this domain did not disrupt local

SUBMITTER: Dwyer ME 

PROVIDER: S-EPMC8566215 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature