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General description
Human VPAC2
Vasoactive intestinal peptide (VIP), a 28 amino acid peptide originally isolated by its vasodilation activity, binds to two class B GPCRs, VPAC1 and VPAC2, to exert its functions in the CNS, vasculature, immune system and adrenal medulla (Harmar et al., 1998). In the immune system, VPAC2 is expressed on stimulated CD4 T cells, and binding of T cell-derived VIP to VPAC2 induces a shift toward the Th2 pathway (Delgado et al., 2004; Voice et al., 2004). In addition, VPAC2 is an essential regulator of the circadian pacemaker of the hypothalamic suprachiasmatic nuclei (Hughes et al., 2004). Chemicon′s VPAC2 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 VPAC2 interactions with PACAP. The membrane preparations exhibit a Kd of 0.9 nM for [125I]-PACAP27. With 5 µg/well VPAC2 Membrane Prep and 0.5 nM [125I]-PACAP27, a greater than 15-fold signal-to-background ratio was obtained.
Application
Radioligand binding assay, and GTPγS binding.
Biochem/physiol Actions
Protein Target: VPAC2 / VIP2
Features and Benefits
Inucbation Conditions
Membranes are mixed with radioactive ligand and unlabeled competitor (see Figures 1 and 2 for concentrations tested) in binding buffer in a nonbinding 96-well plate, and incubated for 1-2 h. Prior to filtration, a GF/C 96-well filter plate is coated with 0.33% polyethyleneimine for 30 min, then washed with 50mM HEPES, pH 7.4, 0.5% BSA. Binding reaction is transferred to the filter plate, and washed 3 times (1 mL per well per wash) with Wash Buffer. The plate is dried and counted.
Binding buffer: 50 mM Hepes, pH 7.4, 5 mM MgCl2, 1 mM CaCl2, 0.2% BSA, filtered and stored at 4°C
Radioligand: [125I] PACAP27 (Perkin Elmer # NEX294)
Wash Buffer: 50 mM Hepes, pH 7.4, 500mM NaCl , 0.1% BSA, filtered and stored at 4°C.
One package contains enough membranes for at least 200 assays (units), where an unit is the amount of membrane that will yield greater than 15-fold signal:background with 125I-labeled PACAP27 at 0.5 nM.
Physical form
Liquid in packaging buffer: 50 mM Tris pH 7.4, 10% glycerol and 1% BSA with no preservatives.
Packaging method: Membranes protein were adjusted to the indicated concentration in packaging buffer, rapidly frozen, and stored at -80°C.
Analysis Note
Signal:background and specific binding values obtained in a competition binding assay with 5ug/well of VPAC2 membrane prep:
| 10 µg/well | 5 µg/well | |
|---|---|---|
| Signal:Background | 25.5. | 22.8 |
| Specific Binding (cpm) | 32913 | 27650 |
SPECIFICATIONS: 1 unit = 5 µg membrane preparation
Bmax: 17.3 pmol/mg
Kd: 0.9 nM
Legal Information
CHEMICON is a registered trademark of Merck KGaA, Darmstadt, Germany
| biological source | human |
| Quality Segment | 100 |
| recombinant | expressed in Chem-1 cells |
| manufacturer/tradename | ChemiScreen,Chemicon® |
| technique(s) | ligand binding assay: suitable (GTPγS),radioligand binding assay (RLBA): suitable |
| NCBI accession no. | NM_003382.3 |
| UniProt accession no. | P41587 |
| shipped in | dry ice |
| storage temp. | -65 to -96°C |
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