When found in cis, HD and PEST domain mutations act synergistically, increasing NOTCH1 transcriptional activity up to ~40-fold, compared with up to ~10-fold and up to ~2-fold increase with HD mutations alone and PEST domain mutations alone, respectively (Weng et al. 2004). HD domain mutations enable spontaneous, ligand-independent, proteolytic release of the NICD1 fragment, although mutants remain responsive to ligand binding (Malecki et al. 2006), while PEST domain mutations prolong NICD1 half-life and transcriptional activity through interference with FBXW7 (FBW7)-mediated ubiquitination and degradation (Thompson et al. 2007, O'Neil et al. 2007). NOTCH1 HD+PEST domain mutants annotated here are NOTCH1 L1600P;P2514Rfs*4, NOTCH1 L1600P;Q2440*, NOTCH1 L1600P;Q2395* and NOTCH1 L1574P;P2474Afs*4.
Lee, W, Blacklow, SC, Silverman, LB, Look, AT, Sanchez-Irizarry, C, Aster, JC, Ferrando, AA, Weng, AP, Morris JP, 4th
Basso, G, Sulis, ML, Buonamici, S, Thompson, BJ, Aifantis, I, Palomero, T, Vilimas, T, Ferrando, AA
Draetta, G, Rao, S, Sears, R, Strack, P, Tibbitts, D, Hardwick, J, Pieters, R, Look, AT, Welcker, M, Meijerink, JP, Winter, C, Grim, J, O'Neil, J, Clurman, BE
Mitchell, JL, Malecki, MJ, Blacklow, SC, Xu, ML, Sanchez-Irizarry, C, Aster, JC, Histen, G
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