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Journal Article
Research Support, N.I.H., Extramural
BAL1 and its partner E3 ligase, BBAP, link Poly(ADP-ribose) activation, ubiquitylation, and double-strand DNA repair independent of ATM, MDC1, and RNF8.
Molecular and Cellular Biology 2013 Februrary
The BAL1 macrodomain-containing protein and its partner E3 ligase, BBAP, are overexpressed in chemotherapy-resistant lymphomas. BBAP selectively ubiquitylates histone H4 and indirectly promotes early 53BP1 recruitment to DNA damage sites. However, neither BBAP nor BAL1 has been directly associated with a DNA damage response (DDR), and the function of BAL1 remains undefined. Herein, we describe a direct link between rapid and short-lived poly(ADP-ribose) (PAR) polymerase 1 (PARP1) activation and PARylation at DNA damage sites, PAR-dependent recruitment of the BAL1 macrodomain-containing protein and its partner E3 ligase, local BBAP-mediated ubiquitylation, and subsequent recruitment of the checkpoint mediators 53BP1 and BRCA1. The PARP1-dependent localization of BAL1-BBAP functionally limits both early and delayed DNA damage and enhances cellular viability independent of ATM, MDC1, and RNF8. These data establish that BAL1 and BBAP are bona fide members of a DNA damage response pathway and are directly associated with PARP1 activation, BRCA1 recruitment, and double-strand break repair.
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