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HTRF MAb PT66-Eu cryptate, 5,000 Assay Points

MAb PT66-Eu cryptate enables the rapid detection of phosphorylation of peptides or proteins on Tyrosine in a biochemical kinase assay format.

For research use only. Not for use in diagnostic procedures.
Product Variants
Part number: 61T66KLA
Unit Size: 5,000 Assay Points
List price: USD 297.92
Your price:
USD 297.92
USD 297.92 /each
Part number: 61T66KLB
Unit Size: 20,000 Assay Points
List price: USD 892.70
Your price:
USD 0.00
USD 892.70 /each


PT66-Eu cryptate is a labeled mouse monoclonal IgG1. It shows to react specifically with phosphorylated tyrosine, both as free amino acid or when conjugated to carriers. No cross-reactivity has been observed with non-phosphorylated tyrosine, phosphothreonine, phosphoserine, AMP or ATP. This allows the construction of a highly specific biochemical Tyrosine kinase assay. Any kind of substrate can be used, from small synthetic peptides to natural substrates, meaning high assay detection versatility. HTRF allows to perform assay at physiological ATP concentrations.


Assay Points
Assay Target Type
Fluorescent reagent
Assay Technology
Therapeutic Area
Infectious Diseases
Oncology & Inflammation
Rare Diseases
Unit Size
5,000 Assay Points

Video gallery

How it works

Assay principle

HTRF kinase assays typically use a combination of a Europium-cryptate labeled anti-phosphoresidue antibody, SA-XL665 and a biotinylated* substrate. The signal is proportional to the concentration of phospho-residues. *Alternatively, other tags such as 6HIS, GST, c-myc, DNP, or FLAG may be used to label the kinase substrate.

Kinase how it works assay principle htrf kinase 61t66kla
Assay protocol

HTRF kinase assays have two basic phases: 1. Enzymatic step: biotinylated substrate is incubated with the kinase of interest and with the compounds in presence of co-factors. The reaction starts with the addition of ATP. 2. Detection step: The phosphorylated biotinylated substrate is then detected by the addition of Streptavidin-XL665 and MAb PT66-Eu cryptate prepared in a buffer containing EDTA to stop the enzymatic reaction.

Kinase how it works assay protocol htrf kinase 61t66kla


Assay validation

Detection at physiological ATP concentration

ATP concentration is an important factor for in vitro kinase assay design, as the sensitivity of ATP competitive inhibitors varies with ATP concentration. As shown in Figure 5, HTRF tolerates the extremely high ATP concentrations (up to mM range) needed for mechanistic studies, e.g. the confirmation of ATP competitive inhibitors. The shift observed for increasing ATP concentrations in the graph confirms the ATP-competitive effect of the compound tested. Assay was performed on a tyrosine kinase revealed by PT66.

Assay validation mab pt66 eu cryptate 1
Membrane friendly

In addition to fresh and frozen cells, the HTRF Kinase toolbox can be used with membrane preparations. The graph depicts an assay scheme for measuring autophosphorylation of a receptor tyrosine kinase (RTK), using membrane preparations as a source of active kinase. Autophosphorylation of an RTK expressed as a tagged fusion protein is detected using a Eu3+ labeled anti-phospho tyrosine antibody and XL665 labeled anti-tag antibody.

PPI Assay validation autophosphylation RTK HTRF 61t66kla



1-1 of 1 Resources
HTRF solutions, guide to major applications

This guide provides you an overview of HTRF applications in several therapeutic areas.

SDS, COAs, Manuals and more Illuminator

SDS, COAs, Manuals and more

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