Carbon export from leaves is controlled via ubiquitination and phosphorylation of sucrose transporter SUC2.

ABSTRACT: All multicellular organisms keep a balance between sink and source activities by controlling nutrient transport at strategic positions. In most plants, photosynthetically produced sucrose is the predominant carbon and energy source, whose transport from leaves to carbon sink organs depends on sucrose transporters. In the model plant Arabidopsis thaliana, transport of sucrose into the phloem vascular tissue by SUCROSE TRANSPORTER 2 (SUC2) sets the rate of carbon export from source leaves, just like the SUC2 homologs of most crop plants. Despite their importance, little is known about the proteins that regulate these sucrose transporters. Here, identification and characterization of SUC2-interaction partners revealed that SUC2 activity is regulated via its protein turnover rate and phosphory

SUBMITTER: Xu Q 

PROVIDER: S-EPMC7084081 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature