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2 protocols using cy3 affinipure donkey anti rat igg h l

1

Antibody Validation and Usage Protocol

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The following commercial antibodies were used: Mouse: anti-EEA1 (BD Biosciences Cat. No. 610457); anti-HA (for immunoblotting) (Santa Cruz Cat. No Sc-7392); anti-myc 9B11 clone (Cell Signalling Technology Cat. No. 2276); anti-His (Sigma Clone His-1; Cat. No. H1029). Rat: anti-HA (for IF) (Roche; clone 3F10). Rabbit: anti-HD-PTP (Proteintech Cat. No.102472-1-AP), anti-endofin (Proteintech Cat. No. 13118-2-AP), anti-SARA (Proteintech Cat. No. 22033-1-AP). The anti-endofin and anti-SARA antibodies were verified by siRNA (Figure S1A) using OnTargetPlus siRNA Smartpool reagents (Dharmacon) for endofin (LQ-020254-01-0005) and SARA (LQ-011939-00-0005), vs a Dharmacon control siRNA. Fluorescent secondary antibodies for IF or for immunoblotting were from Jackson ImmunoResearch Laboratories (PA, USA). Rat-Mouse double labeling IF experiments used Cy3 AffiniPure Donkey Anti-Rat IgG (H+L), immunoadsorbed to prevent cross-reactivity towards mouse IgG (Catalogue 712-165-153), and Alexa488 AffiniPure Donkey Anti-Mouse IgG (H+L), immunoadsorbed to prevent cross-reactivity towards rat IgG (catalogue 715-545-150) (Jackson ImmunoResearch laboratories).
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2

Immunofluorescence Staining of Cytoskeleton and Mitosis Markers

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Cells at subconfluence were fixed with 4% paraformaldehyde (PFA)/PBS for 10 min at 4°C, washed twice with PBS 1X, and incubated with 3% BSA (Sigma-Aldrich) and 0.5% TritonX-100 for 10 min at RT. The reduction of nonspecific background signal was obtained by incubating cells with 1 M glycine (Sigma-Aldrich) and subsequently with block solution consisting of 0.5% Triton X-100, 3% BSA, and 5% normal donkey serum (Jackson Laboratories Immuno Research) for 30min at RT. The cells were incubated with the following primary antibodies: mouse anti-α tubulin (T5168; 1:500; Sigma-Aldrich) and rat anti-PHH3 (phosphorylated histone H3) (1:100; Abcam, ab10543) for 1 h at RT. After the washes, the cells were incubated with species-specific secondary antibodies Alexa Fluor® 488 AffiniPure Donkey Anti-Mouse IgG (H+L) and Cy3-AffiniPure Donkey Anti-Rat IgG (H+L) (#715-545-150 and #712-165-153, respectively; Jackson Immuno Research), diluted 1:200 for 1 h at RT. Nuclei were then counterstained with TO-PRO-3 Iodide (642/661) (T3605; Life Technologies), and the slides were closed with Vectashield mounting medium (Vector Laboratories). Pictures were acquired using a Leica TCS SP2 confocal microscope.
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