| First Author | Martys-Zage JL | Year | 2000 |
| Journal | J Mol Neurosci | Volume | 15 |
| Issue | 3 | Pages | 189-204 |
| PubMed ID | 11303783 | Mgi Jnum | J:121327 |
| Mgi Id | MGI:3709804 | Doi | 10.1385/jmn:15:3:189 |
| Citation | Martys-Zage JL, et al. (2000) Requirement for presenilin 1 in facilitating lagged 2-mediated endoproteolysis and signaling of notch 1. J Mol Neurosci 15(3):189-204 |
| abstractText | Presenilin 1 (PS1), a polytopic membrane protein, is required for endoproteolytic processing at gamma-secretase site within the transmembrane domain of amyloid precursor proteins (APP). In addition, PS1 and its orthologues facilitate signaling of Notch family members, cell-surface receptors that specify cell fates during development. To clarify the mechanism(s) by which PS facilitates Notch signaling, we examined human Jagged-2-dependent metabolism and activity of a chimeric full-length Notchl-GFP molecule expressed in fibroblasts with heterozygous, or homozygous deletions of PS1. We demonstrate that PS1 is required for facilitating Jagged 2-mediated proteolysis and that translocation and accumulation of NICD in the nucleus correlates with signaling activity. Moreover, in a ligand-independent, Ca2+-depletion paradigm, we demonstrate that PS1 facilitates endoproteolysis of a plasma-membrane-associated, Notch1-GFP derivative. Finally, we report that NICD production is inhibited by L-685,458, a potent and selective inhibitor that blocks solubilized gamma-secretase activity and Abeta production in cultured cells. These findings strongly suggest that intramembranous processing of APP and Notch 1 are mediated by similar, if not identical, proteases that require PS1 for their activation. |
