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14 protocols using odyssey fc machine

1

Mitotic Chromosome Isolation from HeLa Cells

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For the analysis of mitotic chromosomes, HeLa cells were synchronized with 2 mM thymidine for 18 h. Cells were released from thymidine into fresh medium, and 6 h later, 0.1 µg/ml nocodazole was added to cells. 4 h after nocodazole addition, mitotic cells were collected by mitotic shake-off and released with 7 µM ICRF-193–containing fresh medium for 20 min. For mitotic chromosome isolation, cells were lysed with lysis buffer (250 mM sucrose, 20 mm Hepes, 100 mM NaCl, 1.5 mM MgCl2, 1 mM EDTA, 1 mM EGTA, 0.2% Triton X-100, 1:2,000 lysophosphatidylcholine, and 15 mM iodoacetic acid), and lysed cells were layered on a 40% glycerol cushion as for chromosome isolation from XEEs. Later, isolated mitotic chromosomes were boiled in SDS-PAGE sample buffer, resolved on 8–16% gradient gels, and subjected to immunoblotting with the indicated antibodies. Signals were acquired using a LI-COR Odyssey Fc machine.
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2

SLC7A11 Antibody Specificity Validation

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SLC7A11 primary antibody specificity (Rabbit monoclonal, Ab37185, Abcam, UK) was determined using Western blotting in cell line lysates: HCC1500, ZR-751, MDA-MB-436, MCF7 and T47D (American Type Culture Collection; Rockville, MD, USA at a dilution of 1:2000. Donkey anti-rabbit (1:15,000, IRDye680 CW, 926–32213, LI-COR Bioscience) was used as a fluorescent secondary antibody. Mouse monoclonal anti-β-actin primary antibody (1:5,000, A5441, Sigma-Aldrich) with donkey anti-mouse fluorescent secondary (1:15,000, IRDye 800CW, 926–68072, LI-COR Bioscience) was used as a control. The Odyssey Fc machine (LI-COR Bioscience) was used to visualize blots showing specific bands at the predicted size of approximately 55 KDa (Supplementary Figure S1).
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3

Protein Expression Analysis of Cell Lines

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Cells were lysed with lysis buffer (Roche), with 10% phosphor STOP and 10% protease inhibitor cocktail. Cell lysates were then collected after centrifugation at 12,000 rpm for 10 m at 4°C. 30μg of lysate protein was loaded and total cellular protein was separated with 8% SDS-polyacrylamide gel electrophoresis, then transblotted onto NC membrane (Life Technology). The membrane was probed with anti-ZIP4 (Proteintech, 1:2000), ZO-1, claudin-1, ZEB1(Cell signaling Technology 1:500), pFAK, FAK (Abcam, 1:1000), pPaxillin, Paxillin (Life tech, 1:1000), and anti-β-actin (Abcam, 1:10000) antibody at 4 °C overnight, and then washed three times with 0.1% Tween 20-TBS and incubated with horseradish peroxidase-linked or NIR-coupled secondary antibody (1:5000) for 2 h at room temperature. The membrane was washed three times with 0.1% Tween 20-TBS. The immunoreacted bands were detected using an enhanced chemiluminescent (ECL) plus reagent kit. We are using the Li-COR Odyssey Fc machine to detect both ECL and the NIR-labeled 2nd antibodies.
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4

Immunoblot Analysis of Bim, PTEN in Stimulated B Cells

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WEHI-control and WEHI-miR148a cells stimulated with 2 µg/ml anti-IgM for 14 h or left unstimulated were washed twice with PBS, and cell extracts were made by resuspending cell pellets in 1% NP-40 buffer containing 1% Nonidet P-40, 150 mM NaCl, 50 mM Tris-Cl (pH 8.0), 1 mM sodium orthovanadate, 1 mM DTT, and proteinase inhibitors (Thermo). 10 µg protein extract per sample was resolved in 10–12.5% gels by SDS-PAGE, transferred onto PVDF membranes, and detected with antibodies specific for murine Bim (Cell Signaling, 2933), Pten (Cell Signaling, 9559), and β-actin (Sigma clone AC-74). Images of the immunoblots were acquired on an Odyssey Fc machine (Li-cor).
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5

Western Blot Immunodetection Protocol

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Proteins were resolved by Mini Gel SDS-PAGE (Biorad® system) and transferred to PVDF membrane (Immobilon-P®- Millipore®) according to standard procedures. Blocking and antibody incubations were performed in TBS - 0.2% Tween-20® 5% milk (Marvel®). The following primary antibodies were used: anti-Ku80, (1:1000)38 (link), anti-actin (1:5000, Santa-Cruz® sc-1615), anti-H2AX-P (1:1000, Abcam® ab11174), anti-H3 (1:2000, Abcam® ab12079), anti-flag (1:2000, SIGMA® F1804 and F2425), anti-mono-ADPr AbD33205 (1:1000)34 (link), Anti-H3S10-p (1:1000, Bethyl® A301-844A-T, and Abcam® ab5176). Global ADP-ribosylation sigma was detected using the reagent anti-PAN-ADPr (1:2000, Merk® MABE1016). Appropriate HRP-conjugated secondary antibodies were used anti-mouse (1;10000, DAKO®), anti-rabbit (1;10000, DAKO®), anti-goat (1;10000, DAKO®) and anti-human (1:5000)34 (link). Immuno-reactive bands were detected by chemo-luminescence induced by Immobilon® western substrate (Millipore®), detected with the LI-COR® Odyssey-Fc machine and quantified using Image-Studio® software.
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6

Validating CDC42 Antibody Specificity

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For validation of CDC42 antibody specificity, Western blotting was performed on whole cell lysates of MCF-7, SKBr3 and MDA-MB231 human breast cancer cell lines (obtained from the American Type Culture Collection; Rockville, MD, USA) using CDC42 antibody (clone PA1-092) at 1:1000 dilution and fluorescent secondary antibodies at 1:15,000 were used (IR Dye 800CW donkey anti-rabbit and 680RD donkey anti-mouse, LI-COR Biosciences, UK). 5% milk (Marvel original dried skimmed milk, Premier Food Groups Ltd, St Albans, UK) was used for blocking. Mouse β-Actin (A5441, Sigma-Aldrich; Clone AC-15; Sigma, UK) at 1:5000 was used as a house-keeping protein. A protein ladder (PageRuler Plus Prestained Protein Ladder, ThermoScientific, Waltham, MA, USA) was included. The fluorescence was then detected using the LI-COR Odyssey Fc machine to visualise the bands, with wavelengths 600, 700 and 800.
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7

Quantification of Hif-1α and Hsp70 in M. amblycephala

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Total proteins from M. amblycephala liver, spleen, brain, gill, and kidney (n = 5 for each group) were quantified and separated on 8% SDS-PAGE, then transferred to nitrocellulose membranes. The membranes were incubated for 2 h with polyclonal antibodies, Hif-1α (1:500) and Hsp70 (1:200) (Boster, China), respectively, and then anti-rabbit IRDye 800CW-labeled secondary antibody (1:10,000) at room temperature for 1 h, and observed using Odyssey Fc machine (Licor Biosciences, USA). Gray values of every band were further calibrated and measured by ImageJ 1.46r (NIH, USA).
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8

Immunoblot Analysis of Bim, PTEN in Stimulated B Cells

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WEHI-control and WEHI-miR148a cells stimulated with 2 µg/ml anti-IgM for 14 h or left unstimulated were washed twice with PBS, and cell extracts were made by resuspending cell pellets in 1% NP-40 buffer containing 1% Nonidet P-40, 150 mM NaCl, 50 mM Tris-Cl (pH 8.0), 1 mM sodium orthovanadate, 1 mM DTT, and proteinase inhibitors (Thermo). 10 µg protein extract per sample was resolved in 10–12.5% gels by SDS-PAGE, transferred onto PVDF membranes, and detected with antibodies specific for murine Bim (Cell Signaling, 2933), Pten (Cell Signaling, 9559), and β-actin (Sigma clone AC-74). Images of the immunoblots were acquired on an Odyssey Fc machine (Li-cor).
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9

Biotinylated Protein Identification via Immunoblotting

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The APEX2 reaction was performed as described above and lysed in RIPA. Aliquots were taken for input, post-streptavidin flow-through, and StrePD. Proteins were separated on an SDS-PAGE gel and transferred to nitrocellulose for Western blotting with the indicated reagents/antibodies. Detection reagents used were streptavidin-HRP (1:1,000; GE Healthcare; RPN1231V), rabbit anti-lamin-B1 (1:10,000; Abcam; ab16048), mouse anti-lamin-A/C (1:5,000; Active Motif; 39287), rabbit anti-emerin (1:5,000; Santa Cruz; sc-15378), mouse anti-SC-35 (1:2,500, Sigma-Aldrich; S4045), rabbit anti-HNRNPA1 (1:2,500; ProteinTech; 11176-1-AP), and rabbit anti-SRSF1 (1:2,500; ProteinTech; 12929-2-AP). Imaging for streptavidin-HRP was done on a Licor Odyssey Fc machine. All other Western blots were imaged with a Licor Odyssey CLx machine.
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10

BRCA1 and RHA1 Protein Detection

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Protein was extracted from cells using 0.1% NP-40, 50 mM Hepes, pH 7.4, 0.15 M NaCl, 5 mM EDTA, 10% glycerin. Protein samples were quantified through Bradford assay then subjected to electrophoresis on 5 or 6% fixed SDS-PAGE gel. Samples were then transferred onto PVDF membrane that had been activated with methanol before transfer. Primary antibodies used were BRCA1 (1:500) [25 (link)] and RHA1 (1:20,000) [25 (link)] in PBS with 1% BSA. Secondary antibody was diluted into 5% milk in blocking buffer, anti-rabbit (1:5000) HRP-conjugated secondary antibody (Cytiva) and visualized under chemiluminescent setting on LiCOR Odyssey Fc machine.
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