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4 protocols using ab133565

1

Immunoprecipitation of Endogenous Proteins

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To immunoprecipitate endogenous proteins, cell extracts were incubated with primary antibodies p14/ARF (AB11048, Abcam), RBX1 (ab133565, Abcam) or control IgG in a rotating incubator overnight at 4 °C, followed by incubation with protein A/G magnetic beads (Bimake) for another 2 h. The immunoprecipitates were washed three times with lysis buffer and analyzed by immunoblotting.
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2

Analyzing Ubiquitin Ligase Complex

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Cell lysates were generated and analyzed via immunoblotting. We used antibodies against RBX1 (ab133565), Cullin2 (ab166917), and ELOB (ab151743), all sourced from Abcam. During the cycloheximide (CHX) chase assays, the cells were treated with 50 μg/mL CHX (C4859, Sigma, Germany), alongside either 1.0 μM/L MLN4924 or DMSO, for predetermined periods.
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3

Cullin Protein Regulation by CHX-chase

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Cell lysates were prepared and analyzed by immunoblotting. Antibody against p14/ARF (AP51072) was purchased from ABGENT (Suzhou city, Jiangsu Province, China). Antibodies against RBX1 (ab133565), Cullin1 (ab75817), Cullin2 (ab166917), Cullin5 (ab18477), Cullin7 (ab96861), EloB (ab151743), Prame (ab219650) were purchased from Abcam (Shanghai, China). Anitbodies againgst Cullin3 (2759), Cullin4A (2699) were from Cell Signaling Technology (Danvers, MA, USA). Antibody against Cullin4B (12916) was from Proteintech (Wuhan, Hubei, China).
For CHX-chase experiments, cells were treated with 50 μg/mL CHX (Sigma, C4859, Merck KGaA, Darmstadt, Hesse, Germany) in combination with 1.0 μmol/L MLN4924 or DMSO for indicated time points [64 (link)].
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4

Western Blot Analysis of Cullin Proteins

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Western blotting analysis was performed as described previously [16 (link)]. Briefly, total proteins were extracted from biopsies and cultured cells using ice-cold radioimmunoprecipitation assay (RIPA) buffer (#89900, Thermo Fisher) containing 1× protease inhibitor (#87785, Thermo Fisher). Equal amounts of total proteins were separated by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) gels and transferred onto polyvinylidene difluoride membranes (#IPSN07852, Sigma-Aldrich). The membranes were blocked with 5% fat-free milk, followed by probing with the following primary antibodies: anti-CUL1 (#ab75817, Abcam, Shanghai, China), anti-CUL2 (#ab166917, Abcam), anti-CUL3 (#ab108407, Abcam), anti-CUL4A (#ab92554, Abcam), anti-CUL4B (#ab67035, Abcam), anti-CUL5 (#ab184177, Abcam), anti-CUL7 (#C1743, Sigma-Aldrich), anti-CUL9 (#HPA052-004, Sigma-Aldrich), anti-SKP1 (#ab76502, Abcam), anti-RBX1 (#ab133565, Abcam), anti-FBXL1 (SAB1100391, Sigma-Aldrich), anti–hypoxia-inducible factor 1α (HIF1α) (#ab2185, Abcam), anti-MEN1 (#ABC514, Sigma-Aldrich), anti-Myc (#ab32, Abcam), anti-HA (#H3663, Sigma-Aldrich), anti-Flag (#F3165, Sigma-Aldrich), and anti-GAPDH (#ab8245, Abcam). After rinsing five times with PBST buffer, the membranes were probed with secondary antibodies. Finally, protein bands were visualized using the Pierce ECL kit (#32106, Thermo Fisher Scientific).
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