LAG-3 is a putative transcriptional activator in the C. elegans Notch pathway (original) (raw)
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- Published: 18 May 2000
Nature volume 405, pages 364–368 (2000)Cite this article
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Abstract
Notch signalling controls growth, differentiation and patterning during normal animal development1,2; in humans, aberrant Notch signalling has been implicated in cancer and stroke3,4. The mechanism of Notch signalling is thought to require cleavage of the receptor in response to ligand binding5, movement of the receptor's intracellular domain to the nucleus6,7, and binding of that intracellular domain to a CSL (for CBF1, Suppressor of Hairless, LAG-1)8,9 protein. Here we identify LAG-3, a glutamine-rich protein that forms a ternary complex together with the LAG-1 DNA-binding protein10 and the receptor's intracellular domain. Receptors with mutant ankyrin repeats that abrogate signal transduction are incapable of complex formation both in yeast and in vitro. Using RNA interference, we find that LAG-3 activity is crucial in Caenorhabditis elegans for both GLP-1 and LIN-12 signalling. LAG-3 is a potent transcriptional activator in yeast, and a Myc-tagged LAG-3 is predominantly nuclear in C. elegans. We propose that GLP-1 and LIN-12 promote signalling by recruiting LAG-3 to target promoters, where it functions as a transcriptional activator.
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Acknowledgements
We acknowledge A. Puoti for providing the plasmid form of the cDNA library; R. Sternglanz, S. M. Hollenberg and A. Grimson for yeast strains and plasmids; and A. Steinberg and L. Vanderploeg for help with the illustrations. A.G.P. is an Howard Hughes Medical Institute predoctoral fellow. J.K. is an investigator of the Howard Hughes Medical Institute.
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Authors and Affiliations
- Howard Hughes Medical Institute and Department of Biochemistry University of Wisconsin-Madison, 433 Babcock Drive, Madison, 53706, Wisconsin, USA
Andrei G. Petcherski & Judith Kimble
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- Andrei G. Petcherski
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Correspondence toJudith Kimble.
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Petcherski, A., Kimble, J. LAG-3 is a putative transcriptional activator in the C. elegans Notch pathway.Nature 405, 364–368 (2000). https://doi.org/10.1038/35012645
- Received: 25 January 2000
- Accepted: 03 March 2000
- Issue Date: 18 May 2000
- DOI: https://doi.org/10.1038/35012645
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