This complex promotes the ubiquitin-mediated degradation of CRY1, specifically targeting lysine 585, thereby limiting CRY1 accumulation and constraining the amplitude of circadian oscillations ( 4.1.7 Fbxl4 Fbxl4 is a Clock-regulated E3 ubiquitin ligase that links molecular circadian oscillators to neuronal excitability and sleep timing in Drosophila ( Fbxl4 transcript levels cycle rhythmically in the large ventral lateral neurons (lLNvs) and are driven directly by Clock-cycle binding to E-box elements within the fbxl4 promoter ( A receptors in lLNvs, thereby reducing GABA sensitivity and enhancing neuronal excitability during the wake phase ( 4.1.8 FBXL3 and FBXL21 FBXL3 and FBXL21 are closely related F-box proteins that regulate circadian rhythms by modulating the stability and degradation of CRY1 and CRY2 proteins in mammals ( Further genetic studies revealed the Past-time (Psttm) mutation in FBXL21 shortens circadian period and counteracts the long-period phenotype of FBXL3 (Ovtm) , illustrating their functional antagonism ( PER1 and DBP (D-site binding protein) ( 4.1.9 FBXW7 FBXW7 is an E3 ubiquitin ligase that plays a role in regulating circadian rhythms by targeting core clock proteins and modulators for degradation

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YX, YZ, and SC contributed significantly to the complete manuscript preparation
Upon surpassing a specific threshold, the mutation level of mtDNA often induces phenotypic changes within cells, thereby leading to alterations in mitochondrial function and signal transduction
USA 104 , 2087820883 (2007)