title: Stabilization of Ultraviolet (UV)-stimulated Scaffold Protein A by Interaction with Ubiquitin-specific Peptidase 7 Is Essential for Transcription-coupled Nucleotide Excision Repair.
abstract: UV-sensitive syndrome is an autosomal recessive disorder characterized by hypersensitivity to UV light and deficiency in transcription-coupled nucleotide excision repair (TC-NER), a subpathway of nucleotide excision repair that rapidly removes transcription-blocking DNA damage. UV-sensitive syndrome consists of three genetic complementation groups caused by mutations in the CSA, CSB, and UVSSA genes. UV-stimulated scaffold protein A (UVSSA), the product of UVSSA, which is required for stabilization of Cockayne syndrome group B (CSB) protein and reappearance of the hypophosphorylated form of RNA polymerase II after UV irradiation, forms a complex with ubiquitin-specific peptidase 7 (USP7). In this study, we demonstrated that the deubiquitination activity of USP7 is suppressed by its interaction with UVSSA. The interaction required the tumor necrosis factor receptor-associated factor domain of USP7 and the central region of UVSSA and was disrupted by an amino acid substitution in the tumor necrosis factor receptor-associated factor-binding motif of UVSSA. Cells expressing mutant UVSSA were highly sensitive to UV irradiation and defective in recovery of RNA synthesis after UV irradiation. These results indicate that the interaction between UVSSA and USP7 is important for TC-NER. Furthermore, the mutant UVSSA was rapidly degraded by the proteasome, and CSB was also degraded after UV irradiation as observed in UVSSA-deficient cells. Thus, stabilization of UVSSA by interaction with USP7 is essential for TC-NER.
authors.affiliation: From the Graduate School of Frontier Biosciences, Osaka University, Yamadaoka 1-3, Suita, Osaka 565-0871, Japan.
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Higa
authors.affiliation: From the Graduate School of Frontier Biosciences, Osaka University, Yamadaoka 1-3, Suita, Osaka 565-0871, Japan.
authors.forename: Xue
authors.initials: X
authors.lastname: Zhang
authors.affiliation: From the Graduate School of Frontier Biosciences, Osaka University, Yamadaoka 1-3, Suita, Osaka 565-0871, Japan ktanaka@fbs.osaka-u.ac.jp.
authors.forename: Kiyoji
authors.initials: K
authors.lastname: Tanaka
authors.affiliation: From the Graduate School of Frontier Biosciences, Osaka University, Yamadaoka 1-3, Suita, Osaka 565-0871, Japan saijom@fbs.osaka-u.ac.jp.
authors.forename: Masafumi
authors.initials: M
authors.lastname: Saijo
mesh_terms: D020816:Amino Acid Motifs; D000818:Animals; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D004260:DNA Repair / Q000502:physiology* / Q000528:radiation effects; D006801:Humans; D055550:Protein Stability / Q000528:radiation effects; D012319:RNA Polymerase II / Q000235:genetics / Q000378:metabolism*; D061987:Sf9 Cells; D018411:Spodoptera; D014158:Transcription, Genetic / Q000502:physiology*; D043222:Ubiquitin Thiolesterase / Q000235:genetics / Q000378:metabolism*; D000076084:Ubiquitin-Specific Peptidase 7; D014466:Ultraviolet Rays
chemical_list: D002352:Carrier Proteins; C573137:UVSSA protein, human; D012319:RNA Polymerase II; C464569:USP7 protein, human; D043222:Ubiquitin Thiolesterase; D000076084:Ubiquitin-Specific Peptidase 7
keywords: deubiquitylation (deubiquitination); genetic disease; nucleotide excision repair; protein degradation; protein stability; protein-protein interaction