The phospho-IKK-beta (Ser177/181) assay enables the cell-based detection of Ser177/181 phosphorylation of activated IKK-beta directly in whole cells.
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  • Ready-to-use
  • Faster and more convenient than ELISA
The phospho-IKK-beta (Ser177/181) assay enables the cell-based detection of Ser177/181 phosphorylation of activated IKK-beta directly in whole cells.
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Overview

The Phospho-IKK-beta (Ser177/181) assay enables the detection of Ser177/181 phosphorylation of activated IKK-beta directly in whole cells. Using a streamlined protocol, amenable to low-volume formats, this kit can be used from basic research to High Throughput drug screening.

Phospho-IKKß (Ser177/181) assay principle

The phospho-IKK-beta (Ser177/181) assay measures IKK beta when phosphorylated at Ser177/181. Contrary to Western Blot, the assay is entirely plate-based and does not require gels, electrophoresis or transfer. The phospho-IKK-beta (Ser177/181) assay uses 2 labeled antibodies: one with a donor fluorophore, the other one with an acceptor. The first antibody is selected for its specific binding to the phosphorylated motif on the protein, the second for its ability to recognize the protein independent of its phosphorylation state. Protein phosphorylation enables an immune-complex formation involving both labeled antibodies and which brings the donor fluorophore into close proximity to the acceptor, thereby generating a FRET signal. Its intensity is directly proportional to the concentration of phosphorylated protein present in the sample, and provides a means of assessing the protein’s phosphorylation state under a no-wash assay format.

Phospho-IKKß (Ser177/181) 2-plate assay protocol

The 2 plate protocol involves culturing cells in a 96-well plate before lysis then transferring lysates to a 384-well low volume detection plate before adding Phospho-IKK beta (Ser177/181) HTRF detection reagents. This protocol enables the cells' viability and confluence to be monitored.

Phospho-IKKß (Ser177/181) 1-plate assay protocol

Detection of Phosphorylated IKK-beta (Ser177/181) with HTRF reagents can be performed in a single plate used for culturing, stimulation and lysis. No washing steps are required. This HTS designed protocol enables miniaturization while maintaining robust HTRF quality.

HTRF phospho-IKKß assay compared to Western Blot

HeLa cells were grown in a T175 flask 37°C, 5% Co2, 2 days. Stimulation was done with IL1b 0.5nM for 15min. After elimination of cell culture medium, 3 mL of supplemented lysis buffer was added and incubated for 45min. Soluble supernatants were collected after 10min centrifuging. Equal amounts of lysates were used for a side by side comparison of WB and HTRF. HTRF assay shows better sensitivity than Western Blot: 12,000 cells for HTRF compared to 46,000 cells for Western Blot.

TNFa dose-response on HeLa cells

Two concentrations of HeLa cells (100 and 200K cells/well) were incubated for 15 minutes at 37°C with various concentrations of TNF alpha. After a 30 minutes lysis incubation time, phosphorylated IKK-beta was measured using the two-plate assay protocol.

IL1ß dose-response on HeLa cells

Two concentrations of HeLa cells (100 and 200K cells/well) were incubated for 15 minutes at 37°C with various concentrations of IL1 beta. After a 30 minutes lysis incubation time, phosphorylated IKK-beta was measured using the two-plate assay protocol.

Detection of phospho and total IKK-beta on HeLa cells

Different cell densities (200K and 100K) of HeLa cells were plated under 100µL in 96-well plate and incubated overnight. Media was aspirated and 50µL of different concentrations of IL-1beta was added during 15 minutes. After incubation, media was aspirated and cells were lysed with 50µL of lysis buffer 1X for 30 min at RT under gentle shaking. 16 µL of lysate were transferred into a 384-well sv white microplate and 4 µL of the HTRF phospho IKKbeta (Ser177/181) or total IKKbeta detection reagents were added. The HTRF signal was recorded after a 2 hour incubation at room temperature.

IKKß Simplified Pathway

Activation of the NF-?B is initiated by the signal-induced degradation of I?B proteins. This occurs primarily via activation of a kinase called the I?B kinase (IKK). IKK is composed of a heterotrimer of 3 subunits, IKK-alpha and IKK-beta (the two catalytic subunits) and IKK-gamma/NEMO (a regulatory component). Activated IKK-beta phosphorylates a protein called the inhibitor of NF-?B, I?B (I?Ba), which binds NF-?B to inhibit its function. Phosphorylated I?B is degraded via the ubiquitination pathway, freeing NF-?B and allowing its entry into the nucleus of the cell, where it activates various genes involved in inflammation and other immune responses. IKK-beta plays a significant role in brain cells following a stroke.
Simplified pathway dissection with HTRF phospho-assays and CyBi-felix liquid handling

Analyse of PI3K/AKT/mTor translational control pathway - Application Notes

Investigating kinase activity in a cellular context

HTRF cellular assays - Scientific Presentations

Open R&D: Sanofi Access Platform

In collaboration with Sanofi - Scientific Presentations

Translating academic research into early stage drug discovery projects

In collaboration with European ScreeningPort - Scientific Presentations

Cisbio lysis buffer compatibility

Cell Signaling: Biomarkers, Phospho- & total-protein Assays - Flyers

HTRF cellular phospho-protein assays

physiologically relevant results fo fast flowing research - Flyers

Save time and money

Switch to HTRF assays - Flyers

Species compatibility

Cell Signaling: Biomarkers, Phospho- & total-protein assays - Flyers

HTRF assays for Oncology and Inflammation

Signaling in the immune syqtem - Brochures

Side-by-side comparison of HTRF, Western Blot, ELISA and AlphaScreen® SureFire®

Do all cell-based kinase assays perform similarly? - Posters

Universal HTRF® phospho-protein platform: from 2D, 3D, primary cells to patient derived tumor cells

Analysis of a large panel of diverse biological samples and cellular models - Posters

HTRF phospho assays reveal subtle drug induced effects in tumor-xenografts

Tumor xenograft analysis: HTRF versus Western blot - Application Notes

HTRF cell-based phospho-protein data normalization

Valuable guidelines for efficiently analyzing and interpreting results - Application Notes

HTRF phospho-total lysis buffer: a universal alternative to RIPA lysis buffers

Increased flexibility of phospho-assays - Application Notes

Best practices for analyzing brain samples with HTRF® phospho assays for neurosciences

Insider Tips for successful sample treatment - Technical Notes

HTRF Alpha-tubulin Housekeeping kit

Properly interpret your compound effect - Application Notes

Optimize your HTRF cell signaling assays on tissues

HTRF and WB compatible guidelines - Technical Notes

Key guidelines to successful cell signaling experiments

Mastering the art of cell signaling assays optimization - Guides

HTRF phospho-assays reveal subtle drug-induced effects

Detailed protocol and direct comparison with WB - Posters

Best practices for analyzing tumor xenografts with HTRF phospho assays

Protocol for tumor xenograft analysis with HTRF - Technical Notes

How to run a cell based phospho HTRF assay

What to expect at the bench - Videos

Unleash the potential of your phosphorylation research with HTRF

Unmatched ease of use, sensitivity and specificity assays - Videos

Cisbio Product Catalog 2019

All your HTRF assays in one document! - Catalog

A guide to Homogeneous Time Resolved Fluorescence

General principles of HTRF - Guides

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