Application

GTPγS Binding and Radioligand Binding Assay.

Biochem/physiol Actions

Protein Target: CCR9

GPCR Class: A

Target Sub-Family: Chemokine

Disclaimer

Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.

General description

Full length Human CCR9

The CCR9 receptor is a GPCR expressed selectively in the thymus, lymph node, spleen, and the small bowel (SB). CCR9 binds to Thymus-expressed chemokine ligand (TECK / CCL25) (Zaballos et al. 1999; Youn et al., 1999; Yu et al., 2000), and is involved in directing the movement of mature T cells in the thymus (Carramolino et al., 2001b). CCR9 also plays an important role in the pathogenesis of SB Crohn′s disease (Carramolino et al., 2001a; Papadakis et al, 2001). The CCR9 selective expression in the small bowel but not the colon indicates the role of CCR9 in the specialized immune response in the SB (Kunkel et al., 2000; Papadakis et al., 2000). It was also shown that CCR9-mediated antiapoptosis could help in the study of cell survival mechanism and T cell malfunctioning (Youn et al, 2002). Chemicon′s CCR9 membrane preparations are crude membrane preparations made from our proprietary stable recombinant cell lines to ensure high-level of GPCR surface expression; thus, they are ideal HTS tools for screening of antagonists of CCR9 interactions with its ligands. The membrane preparations exhibit an EC50 of 8 nM for TECK/CCL25 in a GTPgammaS binding assay.

Legal Information

CHEMICON is a registered trademark of Merck KGaA, Darmstadt, Germany

Physical form

Liquid in packaging buffer: 50 mM Tris pH 7.4, 10% glycerol and 1% BSA with no preservatives.Packaging method: Membrane protein was adjusted to 0.5 mg/ml in packaging buffer, rapidly frozen, and stored at -80°C.

Quality

SPECIFICATIONS:
Kd for TECK/CCL25: ~8 nM in a GTPγS binding assay

Specifications

Inucbation ConditionsASSAY CONDITIONS: Membranes are permeabilized by addition of saponin to an equal concentration by mass, then mixed with [³⁵S]-GTPγS (final concentration of 0.1 nM) in 20 mM HEPES, pH 7.4/100 mM NaCl/10 mM MgCl₂/0.5 µM GDP in a nonbinding 96-well plate. Unlabeled TECK/CCL25 is added to the final concentration indicated in Figure 1 (final volume 100 µL), and incubated for 30 min at 30°C. The binding reaction is transferred to a GF/B filter plate (prewetted with water), and washed 3 times (1 mL per well per wash) with cold 10 mM sodium phosphate, pH 7.4. The plate is dried and counted.

One vial contains enough membranes for at least 200 assays (units), where one unit is the amount of membrane that will yield greater than 1000 cpm specific TECK-stimulated [³⁵S]-GTPγS binding.

The CCR9 membrane preparation is expected to be functional in a radioligand binding assay; however, the end user will need to determine the optimal radiolabeled ligand for use with this product.

Storage and Stability

Maintain frozen at -70°C for up to 2 years. Do not freeze and thaw.