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HTRF Human and Mouse Total ERK Detection Kit, 500 Assay Points

This HTRF kit monitors the cellular ERK expression level and can be used as a normalization assay for the phospho-ERK kit.

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Feature	Specification
Application	Cell Signaling
Sample Volume	16 µL

This HTRF kit monitors the cellular ERK expression level and can be used as a normalization assay for the phospho-ERK kit.

View product information

Product variants

Unit Size: 96 assay points

Part #:

64NRKPET

Unit Size: 500 assay points

Part #:

64NRKPEG

Unit Size: 10,000 assay points

Part #:

64NRKPEH

Unit Size: 50,000 assay points

Part #:

64NRKPEY

For research use only. Not for use in diagnostic procedures. All products to be used in accordance with applicable laws and regulations including without limitation, consumption, and disposal requirements under European REACH regulations (EC 1907/2006).

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Product information

Overview

The Total-ERK1/2 assay is ideal for ERK normalization with the phospho-ERK kits. It is compatible with the buffers from the phospho or Advanced phospho-ERK kits, so the same lysate can be used for fast and easy analysis of the total and the phosphorylated protein populations.

How it works

Total-ERK assay principle

The Total-ERK assay quantifies the expression level of ERK in a cell lysate. Contrary to Western Blot, the assay is entirely plate-based and does not require gels, electrophoresis or transfer. The Total-ERK assay uses two labeled antibodies: one coupled to a donor fluorophore, the other to an acceptor. Both antibodies are highly specific for a distinct epitope on the protein. In presence of ERK in a cell extract, the addition of these conjugates brings the donor fluorophore into close proximity with the acceptor and thereby generates a FRET signal. Its intensity is directly proportional to the concentration of the protein present in the sample, and provides a means of assessing the proteins expression under a no-wash assay format.

Total-ERK 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 Total ERK HTRF detection reagents. This protocol enables the cells' viability and confluence to be monitored.

Total-ERK 1-plate assay protocol

Detection of total ERK 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.

Assay validation

Validation of total-ERK1/2 assay on various cell lines

Human (Hela, A431, HEK293, Jurkat), murine (NIH 3T3) and Hamster (CHO-K1) cells were grown in a T175 flask at 37°C, 5% CO2 for 2 days. After removal of cell culture medium, 3 mL of supplemented lysis buffer 3 were added and incubated for 45 min. Soluble supernatants were collected after 10 min centrifuging. ERK1/2 was detected using 16 µL of cell lysate. Cell lines from other species have not been tested, hence they must be evaluated case by case.

Total-ERK assay to control phosphorylation of ERK1/2

A431 cells (100,000 cells/well) were activated with EGF for 10 min, using the two-plate assay protocol of the Phospho-ERK1/2 and Total-ERK1/2 assays. As expected, results obtained show a dose-response increase of ERK1/2 phosphorylation upon EGF stimulation while ERK1/2 expression level remains constant.

Simplified pathway

MAPK/ERK cell signaling

The MAPK/ERK signaling cascade is activated by a wide variety of receptors involved in growth and differentiation. The core signal transduction cascade elicits regulation of numerous cellular processes including adhesion, migration, apoptosis, differentiation and metabolism. MEK1/2 catalyze the phosphorylation of ERK1/2 at Tyr204 and Thr202. In response, ERK phosphorylates hundreds of cytoplasmic and nuclear substrates. The wide complexity and diversity of MAPK signaling makes ERK a key regulator and major signaling node in biology.

ERK in GPCR signaling

ERK modulation plays a major role in GPCR signaling and is therefore an important measurable GPCR readout. GPCRs act via G proteins to regulate a wide range of cellular functions. Upon stimulation, these receptors activate effectors like adenylate cyclase and phospholipase C, which influence not only intracellular concentrations of second messengers like cAMP and Ca2+, but also mediate ERK1/2 phosphorylation. GPCRs have also been shown to mediate ERK1/2 activation in a G protein-independent but beta-arrestin dependent manner.

Specifications

Other specifications

Application	Cell Signaling
Brand	HTRF
Detection Modality	HTRF
Molecular Modification	Total
Product Group	Kit
Sample Volume	16 µL
Shipping Conditions	Shipped in Dry Ice
Target	ERK1/2
Target Class	Phosphoproteins
Target Species	Human Mouse
Technology	TR-FRET
Therapeutic Area	Metabolism/Diabetes NASH/Fibrosis Neuroscience Oncology & Inflammation Rare Diseases
Unit Size	500 assay points