MERIT40 controls BRCA1-Rap80 complex integrity and recruitment to DNA double-strand breaks.

Abstract	Rap80 targets the breast cancer suppressor protein BRCA1 along with Abraxas and the BRCC36 deubiquitinating enzyme (DUB) to polyubiquitin structures at DNA double-strand breaks (DSBs). These DSB targeting events are essential for BRCA1-dependent DNA damage response-induced checkpoint and repair functions. Here, we identify MERIT40 (Mediator of Rap80 Interactions and Targeting 40 kD)/(C19orf62) as a Rap80-associated protein that is essential for BRCA1-Rap80 complex protein interactions, stability, and DSB targeting. Moreover, MERIT40 is required for Rap80-associated lysine(63)-ubiquitin DUB activity, a critical component of BRCA1-Rap80 G2 checkpoint and viability responses to ionizing radiation. Thus, MERIT40 represents a novel factor that links BRCA1-Rap80 complex integrity, DSB recognition, and ubiquitin chain hydrolytic activities to the DNA damage response. These findings provide new molecular insights into how BRCA1 associates with independently assembled core protein complexes to maintain genome integrity.
Authors	Genze Shao, Jeffrey Patterson-Fortin, Troy E Messick, Dan Feng, Niraj Shanbhag, Yingqun Wang, Roger A Greenberg
Journal	Genes & development (Genes Dev) Vol. 23 Issue 6 Pg. 740-54 (Mar 15 2009) ISSN: 1549-5477 [Electronic] United States
PMID	19261746 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
Chemical References	Adaptor Proteins, Signal Transducing BABAM1 protein, human BRCA1 Protein Carrier Proteins DNA-Binding Proteins Histone Chaperones Nuclear Proteins UIMC1 protein, human Ubiquitin
Topics	Adaptor Proteins, Signal Transducing BRCA1 Protein (metabolism) Carrier Proteins (genetics, metabolism, physiology) Cell Cycle (physiology, radiation effects) Cell Line, Tumor DNA Breaks, Double-Stranded DNA Repair (physiology) DNA-Binding Proteins Histone Chaperones Humans Nuclear Proteins (metabolism) Protein Binding Ubiquitin (metabolism)

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