AHNAK controls 53BP1-mediated p53 response by restraining 53BP1 oligomerization and phase separation.
Mol Cell
; 81(12): 2596-2610.e7, 2021 06 17.
Article
in En
| MEDLINE
| ID: mdl-33961796
ABSTRACT
p53-binding protein 1 (53BP1) regulates both the DNA damage response and p53 signaling. Although 53BP1's function is well established in DNA double-strand break repair, how its role in p53 signaling is modulated remains poorly understood. Here, we identify the scaffolding protein AHNAK as a G1 phase-enriched interactor of 53BP1. We demonstrate that AHNAK binds to the 53BP1 oligomerization domain and controls its multimerization potential. Loss of AHNAK results in hyper-accumulation of 53BP1 on chromatin and enhanced phase separation, culminating in an elevated p53 response, compromising cell survival in cancer cells but leading to senescence in non-transformed cells. Cancer transcriptome analyses indicate that AHNAK-53BP1 cooperation contributes to the suppression of p53 target gene networks in tumors and that loss of AHNAK sensitizes cells to combinatorial cancer treatments. These findings highlight AHNAK as a rheostat of 53BP1 function, which surveys cell proliferation by preventing an excessive p53 response.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Tumor Suppressor p53-Binding Protein 1
/
Membrane Proteins
/
Neoplasm Proteins
Type of study:
Prognostic_studies
Limits:
Humans
Language:
En
Journal:
Mol Cell
Journal subject:
BIOLOGIA MOLECULAR
Year:
2021
Document type:
Article