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TitleAutologous K63 deubiquitylation within the BRCA1-A complex licenses DNA damage recognition.
Journal, issue, pagesJ Cell Biol, Vol. 221, Issue 9, Year 2022
Publish dateSep 5, 2022
AuthorsQinqin Jiang / Martina Foglizzo / Yaroslav I Morozov / Xuejiao Yang / Arindam Datta / Lei Tian / Vaughn Thada / Weihua Li / Elton Zeqiraj / Roger A Greenberg /
PubMed AbstractThe BRCA1-A complex contains matching lysine-63 ubiquitin (K63-Ub) binding and deubiquitylating activities. How these functionalities are coordinated to effectively respond to DNA damage remains ...The BRCA1-A complex contains matching lysine-63 ubiquitin (K63-Ub) binding and deubiquitylating activities. How these functionalities are coordinated to effectively respond to DNA damage remains unknown. We generated Brcc36 deubiquitylating enzyme (DUB) inactive mice to address this gap in knowledge in a physiologic system. DUB inactivation impaired BRCA1-A complex damage localization and repair activities while causing early lethality when combined with Brca2 mutation. Damage response dysfunction in DUB-inactive cells corresponded to increased K63-Ub on RAP80 and BRCC36. Chemical cross-linking coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) and cryogenic-electron microscopy (cryo-EM) analyses of isolated BRCA1-A complexes demonstrated the RAP80 ubiquitin interaction motifs are occupied by ubiquitin exclusively in the DUB-inactive complex, linking auto-inhibition by internal K63-Ub chains to loss of damage site ubiquitin recognition. These findings identify RAP80 and BRCC36 as autologous DUB substrates in the BRCA1-A complex, thus explaining the evolution of matching ubiquitin-binding and hydrolysis activities within a single macromolecular assembly.
External linksJ Cell Biol / PubMed:35938958 / PubMed Central
MethodsEM (single particle)
Resolution4.0 - 6.2 Å
Structure data

EMDB-14999: ARISC-RAP80 complex, Map 1
Method: EM (single particle) / Resolution: 6.2 Å

EMDB-15000: ARISC-RAP80 complex, Map 2
Method: EM (single particle) / Resolution: 5.1 Å

EMDB-15001: ARISC-RAP80 complex, Map 3
Method: EM (single particle) / Resolution: 4.4 Å

EMDB-15002: ARISC-RAP80 complex, Map 4
Method: EM (single particle) / Resolution: 4.0 Å

EMDB-15003: ARISC-RAP80 complex, Map 5
Method: EM (single particle) / Resolution: 5.9 Å

Source
  • Homo sapiens (human)

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