Solution NMR structure of Notch1 TMD

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 40 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

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Permissive Conformations of a Transmembrane Helix Allow Intramembrane Proteolysis by gamma-Secretase.

Ortner, M.Guschtschin-Schmidt, N.Stelzer, W.Muhle-Goll, C.Langosch, D.

(2023) J Mol Biol 435: 168218-168218

  • DOI: https://doi.org/10.1016/j.jmb.2023.168218
  • Primary Citation of Related Structures:  
    8OR5, 8ORY, 8ORZ, 8OS0

  • PubMed Abstract: 

    The intramembrane protease γ-secretase activates important signaling molecules, such as Notch receptors. It is still unclear, however, how different elements within the primary structure of substrate transmembrane domains (TMDs) contribute to their cleavability. Using a newly developed yeast-based cleavage assay, we identified three crucial regions within the TMDs of the paralogs Notch1 and Notch3 by mutational and gain-of-function approaches. The AAAA or AGAV motifs within the N-terminal half of the TMDs were found to confer strong conformational flexibility to these TMD helices, as determined by mutagenesis coupled to deuterium/hydrogen exchange. Crucial amino acids within the C-terminal half may support substrate docking into the catalytic cleft of presenilin, the enzymatic subunit of γ-secretase. Further, residues close to the C-termini of the TMDs may stabilize a tripartite β-sheet in the substrate/enzyme complex. NMR structures reveal different extents of helix bending as well as an ability to adopt widely differing conformational substates, depending on the sequence of the N-terminal half. The difference in cleavability between Notch1 and Notch3 TMDs is jointly determined by the conformational repertoires of the TMD helices and the sequences of the C-terminal half, as suggested by mutagenesis and building molecular models. In sum, cleavability of a γ-secretase substrate is enabled by different functions of cooperating TMD regions, which deepens our mechanistic understanding of substrate/non-substrate discrimination in intramembrane proteolysis.

  • Organizational Affiliation

    Chair of Biopolymer Chemistry, Technical University of Munich, Freising, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Notch 1 extracellular truncation30Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P46531 (Homo sapiens)
Explore P46531 
Go to UniProtKB:  P46531
GTEx:  ENSG00000148400 
Entity Groups  
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UniProt GroupP46531
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 40 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
German Research Foundation (DFG)GermanyFOR2290

Revision History  (Full details and data files)

  • Version 1.0: 2023-08-16
    Type: Initial release
  • Version 1.1: 2023-08-23
    Changes: Database references