5NJK

PTB domain of human Numb isoform-1

Summary for 5NJK

• Entry DOI: 10.2210/pdb5njk/pdb
• Descriptor: Protein numb homolog, ALA-TYR-ILE-GLY-PRO-PTR-LEU, SULFATE ION, ... (4 entities in total)
• Functional Keywords: ptb domain, numb, breast cancer, endocytosis
• Biological source: Homo sapiens (Human); More
• Cellular location: Membrane; Peripheral membrane protein: P49757
• Total number of polymer chains: 12
• Total formula weight: 113013.58

Authors

Mapelli, M.,Di Fiore, P.P. (deposition date: 2017-03-29, release date: 2017-12-13, Last modification date: 2024-11-13)

Primary citation

Colaluca, I.N.,Basile, A.,Freiburger, L.,D'Uva, V.,Disalvatore, D.,Vecchi, M.,Confalonieri, S.,Tosoni, D.,Cecatiello, V.,Malabarba, M.G.,Yang, C.J.,Kainosho, M.,Sattler, M.,Mapelli, M.,Pece, S.,Di Fiore, P.P.
A Numb-Mdm2 fuzzy complex reveals an isoform-specific involvement of Numb in breast cancer.
J. Cell Biol., 217:745-762, 2018

PubMed Abstract: Numb functions as an oncosuppressor by inhibiting Notch signaling and stabilizing p53. This latter effect depends on the interaction of Numb with Mdm2, the E3 ligase that ubiquitinates p53 and commits it to degradation. In breast cancer (BC), loss of Numb results in a reduction of p53-mediated responses including sensitivity to genotoxic drugs and maintenance of homeostasis in the stem cell compartment. In this study, we show that the Numb-Mdm2 interaction represents a fuzzy complex mediated by a short Numb sequence encompassing its alternatively spliced exon 3 (Ex3), which is necessary and sufficient to inhibit Mdm2 and prevent p53 degradation. Alterations in the Numb splicing pattern are critical in BC as shown by increased chemoresistance of tumors displaying reduced levels of Ex3-containing isoforms, an effect that could be mechanistically linked to diminished p53 levels. A reduced level of Ex3-less Numb isoforms independently predicts poor outcome in BCs harboring wild-type p53. Thus, we have uncovered an important mechanism of chemoresistance and progression in p53-competent BCs.

PubMed: 29269425
DOI: 10.1083/jcb.201709092

Experimental method

X-RAY DIFFRACTION (3.13 Å)