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- W2100095750 abstract "Cryptochrome (CRY) is the primary circadian photoreceptor in Drosophila . It resets the circadian clock by promoting light-induced degradation of the clock proteins Timeless and Period, as well as its own proteolysis. The E3 ligases that ubiquitylate Timeless and Period before degradation are known and it is known that Drosophila (d) CRY is degraded by the ubiquitin-proteasome system as well. To identify the E3 ligase for dCRY we screened candidates in S2 cells by RNAi. Knockdown of each of the 25 putative F-box proteins identified by bioinformatics did not attenuate the light-induced degradation of dCRY. However, knockdown of a WD40 protein, Bromodomain and WD repeat domain containing 3 (Brwd3) (CG31132/Ramshackle) caused strong attenuation of dCRY degradation following light exposure. We found that BRWD3 functions as a Damage-specific DNA binding protein 1 (DDB1)- and CULLIN (CUL)4-associated factor in a Cullin4-RING Finger E3 Ligase (CRL4) that mediates light-dependent binding of dCRY to CUL4-ROC1-DDB1-BRWD3, inducing ubiquitylation of dCRY and its light-induced degradation. Thus, this study identifies a light-activated E3 ligase complex essential for light-mediated CRY degradation in Drosophila cells." @default.
- W2100095750 created "2016-06-24" @default.
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- W2100095750 date "2013-03-11" @default.
- W2100095750 modified "2023-09-30" @default.
- W2100095750 title "Ramshackle (Brwd3) promotes light-induced ubiquitylation of <i>Drosophila</i> Cryptochrome by DDB1-CUL4-ROC1 E3 ligase complex" @default.
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- W2100095750 doi "https://doi.org/10.1073/pnas.1303234110" @default.
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