Characterization of the Preferred Cation Cofactors of Chloroplast Protein Kinases in Arabidopsis Thaliana

Overview

Journal FEBS Open Bio

Specialty Biology

Date 2023 Jan 23

PMID 36683405

Authors

Roberto Espinoza-Corral

Serena Schwenkert

Anja Schneider

Affiliations

Soon will be listed here.

Abstract

Chloroplasts sense a variety of stimuli triggering several acclimation responses. One prominent response is the mechanism of state transitions, which enables rapid adaption to changes in illumination. Here, we investigated the link between divalent cations (calcium, magnesium, and manganese) and protein kinase activity in Arabidopsis chloroplasts. Our results show that manganese ions are the strongest activator of kinase activity in chloroplasts followed by magnesium ions, whereas calcium ions are not able to induce kinase activity. Additionally, the phosphorylation of specific protein bands is strongly reduced in chloroplasts of a cmt1 mutant, which is impaired in manganese import into chloroplasts, as compared to the wild-type. These findings provide insights for the future characterization of chloroplast protein kinase activity and potential target proteins.

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