K63-linked polyubiquitin chains bind to DNA to facilitate DNA damage repair.

ABSTRACT: Polyubiquitylation is canonically viewed as a posttranslational modification that governs protein stability or protein-protein interactions, in which distinct polyubiquitin linkages ultimately determine the fate of modified protein(s). We explored whether polyubiquitin chains have any nonprotein-related function. Using in vitro pull-down assays with synthetic materials, we found that polyubiquitin chains with the Lys63 (K63) linkage bound to DNA through a motif we called the "DNA-interacting patch" (DIP), which is composed of the adjacent residues Thr9, Lys11, and Glu34 Upon DNA damage, the binding of K63-linked polyubiquitin chains to DNA enhanced the recruitment of repair factors through their interaction with an Ile44 patch in ubiquitin to facilitate DNA repair. Furthermore, experimental or cancer patient-derived mutations within the DIP impaired the DNA binding capacity of ubiquitin and subsequently attenuated K63-linked polyubiquitin chain accumulation at sites of DNA damage, thereby resulting in defective DNA repair and increased cellular sensitivity to DNA-damaging agents. Our results therefore highlight a critical physiological role for K63-linked polyubiquitin chains in binding to DNA to facilitate DNA damage repair.

SUBMITTER: Liu P 

PROVIDER: S-EPMC6434707 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature