FtsH2-Dependent Proteolysis of EXECUTER1 Is Essential in Mediating Singlet Oxygen-Triggered Retrograde Signaling in Arabidopsis thaliana.

ABSTRACT: Photosystem II reaction center (PSII RC) and light-harvesting complex inevitably generate highly reactive singlet oxygen (¹O₂) that can impose photo-oxidative damage, especially when the rate of generation exceeds the rate of detoxification. Besides being toxic, ¹O₂ has also been ascribed to trigger retrograde signaling, which leads to nuclear gene expression changes. Two distinctive molecular components appear to regulate ¹O₂ signaling: a volatile signaling molecule β-cyclocitral (β-CC) generated upon oxidation of β-carotene by ¹O₂ in PSII RC assembled in grana core, and a thylakoid membrane-bound FtsH2 metalloprotease that promotes ¹O₂-triggered signaling through the proteolysis

SUBMITTER: Dogra V 

PROVIDER: S-EPMC5489589 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature