Journal
FEBS JOURNAL
Volume 285, Issue 5, Pages 965-976Publisher
WILEY
DOI: 10.1111/febs.14382
Keywords
nucleotide excision repair; ubiquitination; ubiquitin-specific peptidase 7; UV-sensitive syndrome; UV-stimulated scaffold protein A
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Funding
- Japan Society for the Promotion of Science (JSPS) [15H02820, 22131009]
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Transcription-coupled nucleotide excision repair (TC-NER) is a subpathway of nucleotide excision repair that efficiently removes transcription-blocking DNA damage from the transcribed strands of active genes. UVSSA is a causative gene for UV-sensitive syndrome ((UVS)-S-S), which is an autosomal recessive disorder characterized by hypersensitivity to UV light and deficiency in TC-NER. UV-stimulated scaffold protein A (UVSSA), the product of UVSSA, forms a complex with ubiquitin-specific peptidase 7 (USP7) and is stabilized by interaction with USP7. The central region of UVSSA, which contains the tumor necrosis factor receptor-associated factor (TRAF)-binding motif, is required for the interaction with the N-terminal TRAF domain of USP7. Here, we showed that UVSSA is mono-ubiquitinated invitro and identified a lysine residue (Lys(414)) in UVSSA as the target of ubiquitination. The deubiquitination activity of USP7 was inhibited by the ubiquitin-conjugating enzyme UbcH6. Lys(414) was also modified by poly-ubiquitin chains invivo. UVSSA deficient in the interaction with USP7 is ubiquitinated and degraded by the proteasome, and the degradation leads to deficiency in TC-NER. The substitution of Lys(414) by Arg of UVSSA inhibited its degradation and thereby suppressed the deficiency in TC-NER.
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