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3 protocols using anti ddx5

1

Chromatin Immunoprecipitation with qPCR Analysis

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Example 13

Conventional ChIP-qPCR was performed. Briefly, cells were crosslinked with 1% formaldehyde at room temperature for 10 minutes followed by glycine quenching, cell lysis, nuclei isolation and lysis, and sonication to obtain 150-200 bp DNA fragments. Complexes were immunoprecipitated overnight using 10 μg of anti-HA tag (Cell Signaling 3724), anti-Flag tag (Sigma F1804), anti-H3K4me3 (AbCam ab8580), anti-RNA Pol-II (Active Motif 61083), or anti-DDX5 (Bethyl A300-523A). Real-time qPCR of purified DNA was performed using SYBR Green I MasterMix (Roche 4707516001) on the Light Cycler 48011 (Roche). qPCR primers are provided in Table 9.

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2

Chromatin Immunoprecipitation qPCR Protocol

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Conventional ChIP-qPCR was performed. Briefly, cells were crosslinked with 1% formaldehyde at room temperature for 10 min followed by glycine quenching, cell lysis, nuclei isolation and lysis and sonication to obtain 150–200 bp DNA fragments. Complexes were immunoprecipitated overnight using 10 μg of anti-HA tag (Cell Signaling 3724), anti-Flag tag (Sigma F1804), anti-H3K4me3 (AbCam ab8580), anti-RNA Pol-II (Active Motif 61083) or anti-DDX5 (Bethyl A300-523A). Real-time qPCR of purified DNA was performed using SYBR Green I MasterMix (Roche 4707516001) on the Light Cycler 480II (Roche). qPCR primers are provided in Supplementary Table 1.
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3

Immunofluorescence Staining of Cellular Markers

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Cells were grown on Lab-Tek 2-well chamber slides (Nunc, Thermo) at 2 × 104 cells per well. The cells were fixed in 3.6% formaldehyde in phosphate-buffered saline (PBS), permeabilized in 0.1% NP-40 in PBS at room temperature, and incubated with anti-HA antibody (3F10; F. Hoffmann-La Roche AG, Basel, Switzerland) at a 1:300 dilution in PBS containing 3% bovine serum albumin (BSA) at 37°C for 30 min. I also used anti-DDX6 (A300-460A; Bethyl Lab), anti-XRN1 (A300-443A; Bethyl Lab), anti-G3BP1 (A302-033A; Bethyl), anti-DDX21 (A300-627A; Bethyl Lab), anti-MOV10 (A301-571A; Bethyl Lab), anti-DDX5 (A300-523A; Bethyl Lab), and anti-SARS-CoV-2 nucleocapsid (ab273434 [6H3]; Abcam or GTX632269 [6H3]; GeneTex) antibodies as primary antibodies. Cells were then stained with donkey anti-mouse IgG (H+L) Alexa Fluor 594-conjugated secondary antibody and/or donkey anti-rabbit or anti-rat IgG (H+L) Alexa Fluor 594-conjugated secondary antibody (Thermo Fisher Scientific Inc., Waltham, MA, USA), at a 1:300 dilution in PBS containing 3% BSA at 37°C for 30 min. Nuclei were stained with DAPI (4′,6-diamidino-2-phenylindole). Following washing 3 times in PBS, the cover slides were mounted on slides using SlowFade Gold antifade reagent (Life Technology). Samples were analyzed under a confocal laser-scanning microscope (FV1200; Olympus, Tokyo, Japan).
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