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1

Immunodetection of HPV16 Proteins

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Anti-HPV16E6 antibodies 1E-6F4 (E6 N-ter) and 2E-3F8 (E6 C-ter) were obtained from Euromedex. Anti-p53 (DO-1) and anti-pRb (4H1) antibodies were obtained from Cell Signaling. Anti-β-actin (AC-15) antibody was obtained from Sigma-Aldrich. Anti-HPV16E7 (NM2) antibody was obtained from Santa Cruz Biotechnology. HRP-conjugated goat anti-mouse secondary antibody was purchased from BD Pharmingen. Primary and secondary antibodies have been diluted respectively to 1:1000 and 1:5000 in blocking buffer (except for β-actin at 1:20,000 and 1:30,000).
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Western Blot Assays with Antibodies and Plasmids

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The following antibodies were used in western blot assays: anti-β-actin (A15), anti-Flag M2 and anti-Flag M2 agarose resin (Sigma), anti-HA (3F10), anti-HA agarose resin (Roche Applied Science), anti-p53 (DO-1, which detects the N-terminal epitope comprising amino acids 11–25), anti-p53 (full-length), anti-CBP(Cell Signaling Technology), anti-p21, anti-PUMA, anti-MDM2 (Santa Cruz), anti-Ac-K101-p53, anti-Ac-K164-p53, anti-Ac-p53 C-terminal (made in-house), anti-pan-acetylation-Lysine (Ac-K) and anti-pan β-hydroxybutyrylation-Lysine (BHB-K) (PTM BioLabs; Hangzhou, China).
Plasmids Flag-p53, Flag-p300, CBP-HA and CBP-HA mutants were from Dr. Gu’s lab4 (link),8 (link).
siRNA targeting CBP and p300 (1#: 5′-GAGGUCGUUUACAUAAATT-3′; 2#: 5′-UUUAUGUAAACGCGACCUCTT-3′) and a negative control (5′-UUCUCCGAACGUGUCACGUTT-3′) were synthesized by GenePharma (China).
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Western Blot Analysis of DNA Damage Response

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Western blot and detection were performed as previously reported (36 (link)). The activation state of DNA damage response proteins was analyzed by using the following antidodies: rabbit mAb anti-Ser1981 p-ATM (Abcam Ltd.); mouse mAb anti-p53 DO-1 and rabbit pAb anti-Thr68 p-CHK2 (Cell Signaling, Beverly, MA, USA). As loading control, levels of β-ACTIN were evaluated by using the mouse mAb anti-β-actin (Sigma-Aldrich).
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Plasmid Construction and Lentivirus Generation

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Expression plasmids of pRK-Flag-hCINAP and pRK-HA-RPS14 were constructed by inserting full-length complementary DNAs of hCINAP or RPS14 into the pRK vector at EcoRI and XbaI restriction sites. Insertions were verified by DNA sequencing. To generate recombinant lentivirus vectors expressing hCINAP-shRNA or non-silencing control-shRNA hCINAP-shRNA-1: 5′- CAGAGUAGUUGAUGAGUUA -3′, hCINAP-shRNA-2: 5′- GAGAGAAGGUGGAGUUAUU -3′ and non-silencing control-shRNA: 5′- UUCUCCGAACGUGUCACGU -3′ were cloned into the pGCSIL-Puromycin lentivirus vector (GeneChem Co. Ltd, China). Antibodies including anti-Myc (M047-3), anti-GST (M071-3), anti-β-actin (PM053), anti-Lamin B1 (PM064), anti-His (D291-3) and anti-α-Tubulin (M175-3) were purchased from MBL. Monoclonal anti-Flag (M2; F3165) and anti-HA(HA-7; H9658) were from Sigma. Anti-p53 (DO-1) was from Cell Signaling Technology. IRDye 800CW Goat anti-mouse (926–32210) and IRDye 800CW Goat anti-rabbit (926–32211) were purchased from LI-COR Bioscience. Fluorescein isothiocyanate-conjugated goat anti-mouse IgG (ZF-0312) and TRITC-conjugated anti-rabbit IgG (ZF-0316) were from ZSGB-Bio. Rabbit polyclonal anti-hCINAP was generated as previously described25 (link).
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