title: Proteasomal regulation of CIRCADIAN CLOCK ASSOCIATED 1 (CCA1) stability is part of the complex control of CCA1.
abstract: The circadian (~24 h) clock has an enormous influence on the biology of plants and controls a plethora of processes including growth, photosynthesis, photoperiodic flowering and transcription of more than 30% of the genome. The oscillator mechanism that generates these circadian rhythms consists of interlocking feedback loops. CIRCADIAN CLOCK ASSOCIATED 1 (CCA1) is a single MYB-transcription factor with a key role in the main feedback loop. CCA1 regulation is important for correct oscillator function and may be an important integration point for environmental signals such as temperature and light that entrain the oscillator. Here we show that CCA1 protein stability is controlled by the proteasome and discuss our findings in the context of the different levels of CCA1 regulation.
authors.affiliation: Department of Plant and Environmental Sciences; The Silberman Institute for Life Sciences; The Hebrew University; Jerusalem, Israel.
authors.forename: Shlomit
authors.initials: S
authors.lastname: Kangisser
authors.forename: Esther
authors.initials: E
authors.lastname: Yakir
authors.forename: Rachel M
authors.initials: RM
authors.lastname: Green
mesh_terms: D017360:Arabidopsis / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D057906:Circadian Clocks / Q000235:genetics*; D002940:Circadian Rhythm / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D046988:Proteasome Endopeptidase Complex / Q000235:genetics* / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; C114425:CCA1 protein, Arabidopsis; D004268:DNA-Binding Proteins; D014157:Transcription Factors; D046988:Proteasome Endopeptidase Complex
keywords: CCA1; arabidopsis; circadian; degradation; inhibitor; proteasome; protein