The Molecular Mechanism of Notch Activation

• Published in: Advances in experimental medicine and biology Vol. 1066; p. 47
• Main Authors: Lovendahl, Klaus N, Blacklow, Stephen C, Gordon, Wendy R
• Format: Journal Article
• Language: English
• Published: United States 2018
• Subjects: Animals; Humans; Protein Domains; Proteolysis; Receptors, Notch - chemistry; Receptors, Notch - genetics; Receptors, Notch - metabolism; Signal Transduction - physiology; Structure-Activity Relationship; Single molecule force spectroscopy; Mechanotransduction; Notch signaling; X-ray structure; Molecular tension sensors
• ISSN: 0065-2598
• DOI: 10.1007/978-3-319-89512-3_3

Research in the last several years has shown that Notch proteolysis, and thus Notch activation, is conformationally controlled by the extracellular juxtamembrane NRR of Notch, which sterically occludes the S2 protease site until ligand binds. The question of how conformational exposure of the protease site is achieved during physiologic activation, and thus how normal activation is bypassed in disease pathogenesis, has been the subject of intense study in the last several years, and is the subject of this chapter. Here, we summarize the structural features of the NRR domains of Notch receptors that establish the autoinhibited state and then review a number of recent studies aimed at testing the mechanotransduction model for Notch signaling using force spectroscopy and molecular tension sensors.