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  • Johansson, Mikael, et al. (author)
  • Partners in time: EARLY BIRD reveals novel regulatory function of ZEITLUPE in the Arabidopsis clock
  • Other publication (other academic/artistic)abstract
    • The circadian clock of the model plant Arabidopsis thaliana is made up of acomplex series of interacting feedback loops whereby proteins regulate their ownexpression across day and night. early bird (ebi) is a circadian mutation that causesthe clock to speed up: ebi plants have short circadian periods, early phase of clockgene expression and are early flowering. We show that EBI associates with ZEITLUPE (ZTL), known to act in the plant clock as a post-translational mediator of protein degradation. However, EBI is not degraded by its interaction with ZTL. Instead, EBI acts in opposition to ZTL, modulating the expression of key circadiancomponents. The partnership of EBI with ZTL reveals a novel mechanism involved incontrolling the complex transcription-translation feedback loops of the clock. Thiswork highlights the importance of cross-talk between the ubiquitination pathway andtranscriptional control for regulation of the plant clock
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