Volume 43, Issue 5, Pages (September 2011)

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Volume 43, Issue 5, Pages 788-797 (September 2011) NBS1 Recruits RAD18 via a RAD6-like Domain and Regulates Pol η-Dependent Translesion DNA Synthesis  Hiromi Yanagihara, Junya Kobayashi, Satoshi Tateishi, Akihiro Kato, Shinya Matsuura, Hiroshi Tauchi, Kouichi Yamada, Jun Takezawa, Kaoru Sugasawa, Chikahide Masutani, Fumio Hanaoka, Corry M. Weemaes, Toshio Mori, Lee Zou, Kenshi Komatsu  Molecular Cell  Volume 43, Issue 5, Pages 788-797 (September 2011) DOI: 10.1016/j.molcel.2011.07.026 Copyright © 2011 Elsevier Inc. Terms and Conditions

Molecular Cell 2011 43, 788-797DOI: (10.1016/j.molcel.2011.07.026) Copyright © 2011 Elsevier Inc. Terms and Conditions

Figure 1 NBS1 Localization at Sites of UV-Induced DNA Damage and High UV Sensitivity in NBS1-Deficient Cells (A) NBS1 localization at UV damage sites was detected in HeLa cells by immunostaining with a CPD antibody 2 hr after exposure to 100 J/m2 through a 5 μm filter. Scale bars represent 10 μm. (B) Expression of NBS1 species in cells from patients with NBS, 07166VA7 and 0823HSV, NBS1-deficient mouse cells, A31-1 and ΔB/ΔB, and both control HeLa cells and BN+/+ cells were determined with western blot. Immunoprecipitation from the cell extracts was carried out with anti-NBS1 and blotted with NBS1. UV sensitivities of these cell lines were determined with colony-formation assay after exposure to 5 J/m2 UV, and the relative sensitivities to that of wild-type cells were indicated. Error bars represent the standard errors. (C) UV sensitivity of A31-1 cells (closed squares), cells complemented with NBS1 cDNA (open squares), and BN+/+ cells (open circles) were determined with colony-formation assay after exposure to 5 and 10 J/m2 UV. Error bars represent the standard errors. (D) Similarly, UV sensitivity of HeLa cells treated with NBS1 siRNA (closed circles), control siRNA (open circles), and HeLa cells treated with NBS1 siRNA after introduction of the siRNA-resistant NBS1 cDNA (closed triangles) were determined. Error bars represent the standard errors. See also Figures S1 and S2. Molecular Cell 2011 43, 788-797DOI: (10.1016/j.molcel.2011.07.026) Copyright © 2011 Elsevier Inc. Terms and Conditions

Figure 2 The Defect in PCNA Ubiquitination, Recruitment of RAD18, and Polηin NBS1-Deficient Cells (A) Formation of Polηfoci was abolished in A31-1 cells but not in cells complemented with NBS1 full-length cDNA and C-terminal (p70:202–754 aa) cDNA and in OCN1 cells 4 hr after exposure to 20 J/m2. The focus positive cells were defined as more than ten foci-containing cells. Error bars represent the standard errors. (B) Similarly, PCNA monoubiquitination was suppressed in A31-1 cells, but not in cells complemented with full-length cDNA and C terminus (p70) NBS1 cDNA and BN+/+ cells 4 hr after exposure to 20 J/m2. (C and D) Failure of formation of RAD18 foci in A31-1 cells (C) and HeLa cells (D) downregulated with NBS1 siRNA, but not in complemented cells and OCN1 cells 2 hr after 20 J/m2 exposure. Error bars represent the standard errors. See also Figure S3. Molecular Cell 2011 43, 788-797DOI: (10.1016/j.molcel.2011.07.026) Copyright © 2011 Elsevier Inc. Terms and Conditions

Figure 3 Epistatic Analysis between NBS1 and Polη, and Mutation Frequency of NBS1-Deficient Cells (A) UV sensitivities of NBS1- and Polη-deficient cells were determined by colony-forming abilities after UV exposure. 293E cells were downregulated with NBS1 siRNA and/or Polη siRNA, and 24 hr later cells were irradiated with 2.5, 5, and 10 J/m2 UV. Error bars represent the standard errors. (B) The mutation frequencies in NBS1- and Polη-deficient cells were determined by use of rpsL gene-containing HITEC mice. HITEC MEF cells were downregulated with NBS1 siRNA and/or Polη siRNA and were irradiated with 5 J/m2 UV. After subculturing for 72 hr, cells were harvested and analyzed for mutation frequencies and the mutation spectrum in rpsL gene. Error bars represent the standard errors. See also Figure S4. Molecular Cell 2011 43, 788-797DOI: (10.1016/j.molcel.2011.07.026) Copyright © 2011 Elsevier Inc. Terms and Conditions

Figure 4 Determination of the RAD18-Binding Region in NBS1 (A) Time course of interaction of RAD18 and NBS1 in 293E cells after exposure to UV. NBS1 was coimmunoprecipitated with RAD18 antibody in the chromatin fraction after exposure to 20 J/m2. (B) Illustration of NBS1 deletion mutants at the C terminus. (C) Failure of interaction of RAD18 with NBS1 clones lacking 639–665 aa (D2) and 650–665 aa (D2-2) after exposure to 20 J/m2. Myc-tagged NBS1 and Flag-tagged RAD18 were prepared according to the method previously described (Miyase et al., 2005; Tauchi et al., 2002). They were coexpressed in human 293E cells and immuunoprecipitated with a Myc antibody in the chromatin fraction 2 hr after exposure to 20 J/m2. Asterisks indicate a nonspecific band. (D) RAD18 did not localize at the areas of UV damage in A31-1 clones lacking 639–669 aa (D2) and 650–665 aa (D2-2) 4 hr after exposure to 100 J/m2 through 3 μm filter, while other clones showed normal localizations. The scale bar represents 10 μm. (E) High UV sensitivity was detected in NBS1-deficienet cells and a clone lacking 650–665 aa (D2-2), but not in the other clones, after exposure to 5 J/m2. The survivals of each UV-treated A31-1 sample with complemented NBS1 mutants were normalized to the vector-transfected but undamaged A31-1 cells. Error bars represent the standard errors. See also Figures S5 and S6. Molecular Cell 2011 43, 788-797DOI: (10.1016/j.molcel.2011.07.026) Copyright © 2011 Elsevier Inc. Terms and Conditions

Figure 5 RAD6 Consensus Sequence Domain in Vertebrate NBS1 at 639–665 aa The conserved region of 639–665 aa in mammal NBS1 is divided into two sequences 640–643 and 649–663, which correspond to two α helices, similar to a domain of RAD6. Red letters indicate the consensus amino acids in mammalian NBS1 and their consensus amino acids in RAD6. N1 and R1 indicate the peptide sequence generated from the RAD6 consensus domain of NBS1 and the corresponding domain of RAD6, respectively (see also Figure 6D). Molecular Cell 2011 43, 788-797DOI: (10.1016/j.molcel.2011.07.026) Copyright © 2011 Elsevier Inc. Terms and Conditions

Figure 6 NBS1-Interacting Region of RAD18 (A) Illustration of several mutants of RAD18 used in these experiments. (B) Requirement of RAD6-binding domain of RAD18 for interaction with RAD18 and NBS1. Myc-tagged RAD18 and Flag-tagged NBS1 were coexpressed in human 293E cells and immunoprecipitated with a Myc antibody 2 hr after exposure to 20 J/m2. (C) Recombinant proteins of RAD18 directly bound to the C terminus of NBS1, but not to the N terminus of NBS1 and to NBS1 D2 mutant lacking 639–669 aa. (D) Inhibition of interaction between RAD18 and NBS1 in the presence of the N1 peptide in the RAD6-like domain of NBS1 and the R1 peptide in RAD18-binding domain of RAD6, but not peptide C in the ATM-binding domain of NBS1 (see also Figure 5). Molecular Cell 2011 43, 788-797DOI: (10.1016/j.molcel.2011.07.026) Copyright © 2011 Elsevier Inc. Terms and Conditions

Figure 7 NBS1-Mediated RAD18 Recruitment Is Facilitated by the Homodimer Formation through the Zinc-Finger Domain (A) A single common domain of RAD18 is used for interaction with RAD6 and NBS1. T7-tagged RAD6 and Flag-tagged NBS1 were coexpressed in 293E cells. T7-tagged RAD6 was coimmunoprecipitated with Flag-tagged NBS1 in the presence of RAD18 full-length and deletion mutant clones, but not in clones lacking the zinc-finger domain, 2 hr after exposure to 20 J/m2. (B) Requirement of the zinc-finger domain for formation of the RAD18 homodimer. Flag-tagged RAD18 and Myc-tagged RAD18 were coexpressed in 293E cells. Flag-tagged RAD18 was detected by immunoprecipitates with a Myc antibody with full-length RAD18 but not in clone lacking the zinc finger 2 hr after exposure to 20 J/m2. The RAD6 domain is also required for relocation of RAD18 to chromatin. (C) The time course of RAD18 foci formation in BN+/+ cells, A31-1 cells, and RAD18−/− cells complemented with RAD18 cDNA (full-length and C207F mutant at zinc-finger domain). Cells were irradiated with 20 J/m2, and the RAD18 foci-positive cells (more than ten foci) were counted. Error bars represent the standard errors. See also Figure S7. Molecular Cell 2011 43, 788-797DOI: (10.1016/j.molcel.2011.07.026) Copyright © 2011 Elsevier Inc. Terms and Conditions