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- W4317623460 endingPage "102929" @default.
- W4317623460 startingPage "102929" @default.
- W4317623460 abstract "Circadian rhythmicity is maintained by a set of core clock proteins including the transcriptional activators CLOCK and BMAL1, and the repressors PER (PER1, PER2, and PER3), CRY (CRY1 and CRY2), and CK1δ. In mice, peak expression of the repressors in the early morning reduces CLOCK- and BMAL1-mediated transcription/translation of the repressors themselves. By late afternoon the repressors are largely depleted by degradation, and thereby their expression is reactivated in a cycle repeated every 24 h. Studies have characterized a variety of possible protein interactions and complexes associated with the function of this transcription-translation feedback loop. Our prior investigation suggested there were two circadian complexes responsible for rhythmicity, one containing CLOCK-BMAL and the other containing PER2, CRY1, and CK1δ. In this investigation, we acquired data from glycerol gradient centrifugation and gel filtration chromatography of mouse liver extracts obtained at different circadian times to further characterize circadian complexes. In addition, anti-PER2 and anti-CRY1 immunoprecipitates obtained from the same extracts were analyzed by liquid chromatography-tandem mass spectrometry to identify components of circadian complexes. Our results confirm the presence of discrete CLOCK-BMAL1 and PER-CRY-CK1δ complexes at the different circadian time points, provide masses of 255 and 707 kDa, respectively, for these complexes, and indicate that these complexes are composed principally of the core circadian proteins." @default.
- W4317623460 created "2023-01-21" @default.
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- W4317623460 date "2023-03-01" @default.
- W4317623460 modified "2023-10-17" @default.
- W4317623460 title "Analysis of mammalian circadian clock protein complexes over a circadian cycle" @default.
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- W4317623460 doi "https://doi.org/10.1016/j.jbc.2023.102929" @default.
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