USP44 Stabilizes DDB2 to Facilitate Nucleotide Excision Repair and Prevent Tumors

Ying Zhang, Imke K. Mandemaker, Syota Matsumoto, Oded Foreman, Christopher P. Holland, Whitney R. Lloyd, Kaoru Sugasawa, Wim Vermeulen, Jurgen A. Marteijn, Paul J. Galardy*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)
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Nucleotide excision repair (NER) is a pathway involved in the repair of a variety of potentially mutagenic lesions that distort the DNA double helix. The ubiquitin E3-ligase complex UV-DDB is required for the recognition and repair of UV-induced cyclobutane pyrimidine dimers (CPDs) lesions through NER. DDB2 directly binds CPDs and subsequently undergoes ubiquitination and proteasomal degradation. DDB2 must remain on damaged chromatin, however, for sufficient time to recruit and hand-off lesions to XPC, a factor essential in the assembly of downstream repair components. Here we show that the tumor suppressor USP44 directly deubiquitinates DDB2 to prevent its premature degradation and is selectively required for CPD repair. Cells lacking USP44 have impaired DDB2 accumulation on DNA lesions with subsequent defects in XPC retention. The physiological importance of this mechanism is evident in that mice lacking Usp44 are prone to tumors induced by NER lesions introduced by DMBA or UV light. These data reveal the requirement for highly regulated ubiquitin addition and removal in the recognition and repair of helix-distorting DNA damage and identify another mechanism by which USP44 protects genomic integrity and prevents tumors.

Original languageEnglish
Article number663411
JournalFrontiers in Cell and Developmental Biology
Publication statusPublished - 16 Apr 2021

Bibliographical note

Funding Information:
This work was funded by support provided to PG from Mayo Clinic and the Hyundai Hope of Wheels Foundation.

Publisher Copyright:
© Copyright © 2021 Zhang, Mandemaker, Matsumoto, Foreman, Holland, Lloyd, Sugasawa, Vermeulen, Marteijn and Galardy.


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