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- W4376223773 abstract "Active Notch signalling is elicited through receptor-ligand interactions that result in release of the Notch intracellular domain (NICD), which translocates into the nucleus. NICD activates transcription at target genes forming a complex with the DNA-binding transcription factor CSL (CBF1/Su(H)/Lag-1) and co-activator Mastermind. Despite this, CSL lacks its own nuclear localisation sequence, and it remains unclear where the tripartite complex is formed. To probe mechanisms involved, we designed an optogenetic approach to control NICD release (OptIC-Notch) and monitored consequences on complex formation and target gene activation. Strikingly we observed that, when uncleaved, OptIC-Notch sequestered CSL in the cytoplasm. Hypothesising that exposure of a juxta membrane ΦWΦP motif is key to sequestration, we masked this motif with a second light sensitive domain in OptIC-Notch{ω}, which was sufficient to prevent CSL sequestration. Furthermore, NICD produced by light-induced cleavage of OptIC-Notch or OptIC-Notch{ω} chaperoned CSL into the nucleus and induced target gene expression, showing efficient light controlled activation. Our results demonstrate that exposure of the ΦWΦP motif leads to CSL recruitment and suggest this can occur in the cytoplasm prior to nuclear entry." @default.
- W4376223773 created "2023-05-13" @default.
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- W4376223773 date "2023-06-01" @default.
- W4376223773 modified "2023-10-16" @default.
- W4376223773 title "OptIC-Notch reveals mechanism that regulates receptor interactions with CSL" @default.
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- W4376223773 doi "https://doi.org/10.1242/dev.201785" @default.
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