RRC ID 75613
Author Carter AA, Ramsey KM, Hatem CL, Sherry KP, Majumdar A, Barrick D.
Title Structural features of the Notch ankyrin domain-Deltex WWE2 domain heterodimer determined by NMR spectroscopy and functional implications.
Journal Structure
Abstract The Notch signaling pathway, an important cell fate determination pathway, is modulated by the ubiquitin ligase Deltex. Here, we investigate the structural basis for Deltex-Notch interaction. We used nuclear magnetic resonance (NMR) spectroscopy to assign the backbone of the Drosophila Deltex WWE2 domain and mapped the binding site of the Notch ankyrin (ANK) domain to the N-terminal WWEA motif. Using cultured Drosophila S2R+ cells, we find that point substitutions within the ANK-binding surface of Deltex disrupt Deltex-mediated enhancement of Notch transcriptional activation and disrupt ANK binding in cells and in vitro. Likewise, ANK substitutions that disrupt Notch-Deltex heterodimer formation in vitro block disrupt Deltex-mediated stimulation of Notch transcription activation and diminish interaction with full-length Deltex in cells. Surprisingly, the Deltex-Notch intracellular domain (NICD) interaction is not disrupted by deletion of the Deltex WWE2 domain, suggesting a secondary Notch-Deltex interaction. These results show the importance of the WWEA:ANK interaction in enhancing Notch signaling.
Volume 31(5)
Pages 584-594.e5
Published 2023-5-4
DOI 10.1016/j.str.2023.03.003
PII S0969-2126(23)00079-5
PMID 36977409
MeSH Animals Ankyrins* Drosophila / metabolism Drosophila Proteins* / genetics Drosophila Proteins* / metabolism Magnetic Resonance Spectroscopy Membrane Proteins / metabolism Receptors, Notch / chemistry Receptors, Notch / genetics Receptors, Notch / metabolism
IF 4.862
DNA material pGa981-6 (RDB06776)