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2 protocols using nupage novex 4 12 bis tris precast polyacrylamide gels

1

Western Blot Analysis of Fly Protein

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Antibodies for Akt (#9272), phospho-Akt (Ser505) (#4054), non-phospho-4E-BP1 (Thr46) (#4923), phospho-4E-BP1 (Thr37/46) (#2855) and β-actin (#4967) were purchased from Cell Signaling Technology (Danvers, MA, USA). Ten flies were homogenized in 100 μl RIPA buffer with protease inhibitor cocktail (Sigma, St. Louis, MO, USA) and PhosSTOP phosphatase inhibitor cocktail (Roche, Nutley, NJ, USA). Supernatant was incubated with LDS loading buffer (Invitrogen, Grand Island, NY, USA) at 70°C for 10 min. Thirty micrograms of denatured protein was separated on 10% NuPAGE Novex 4–12% Bis-Tris precast polyacrylamide gels (Invitrogen, Grand Island, NY, USA) and transferred to PVDF membranes. Following incubation with primary and secondary antibodies, blots were visualized with Pierce ECL western blotting substrate (Thermo Fisher Scientific, Waltham, MA, USA). Three independent biological replicates were generated for all analyses, and samples for AKT and 4E-BP produced at different times. Band intensity was quantified with Image Lab software (Bio-Rad, Hercules, CA, USA).
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2

Rapid Protein Transfer Optimization

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SDS–PAGE was performed on NuPAGE® Novex® 4-12% Bis-Tris pre-cast polyacrylamide gels (Invitrogen). We used iBlot® Transfer Stacks and the iBlot® Gel Transfer Device (Thermo Fisher Scientific) for protein transfer. The 7-min transfer programme efficiently transferred most of the proteins.
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