RAD54L2 mediates a novel mechanism to counter TOP2-DNA adducts

ABSTRACT: The catalytic cycle of topoisomerase 2 (TOP2) enzymes proceeds via a transient DNA double-strand break (DSB) intermediate termed the TOP2 cleavage complex (TOP2cc), in which the TOP2 protein is covalently bound to DNA. Anti-cancer agents such as etoposide operate by stabilising TOP2ccs, ultimately generating genotoxic TOP2-DNA protein crosslinks that require processing and repair. Here, we identify RAD54L2 as a factor promoting TOP2cc resolution. We demonstrate that RAD54L2 acts through a novel mechanism together with ZNF451 and independent of TDP2. Our work suggests a model wherein RAD54L2 recognises sumoylated-TOP2 and, using its ATPase activity, promotes TOP2cc resolution and prevents DSB exposure. These findings suggest RAD54L2-mediated TOP2cc resolution as a potential mechanism for cancer-therapy resistance and highlight RAD54L2 as an attractive candidate for drug discovery.

INSTRUMENT(S):

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Permanent Cell Line Cell, Cell Culture

SUBMITTER: Petra Beli  

LAB HEAD: Petra Beli

PROVIDER: PXD046611 | Pride | 2024-01-26

REPOSITORIES: Pride