ChemiSCREEN Human D3 Dopamine Receptor Membrane Preparation

Human D3 GPCR membrane preparation for Radioligand binding Assays & GTPγS binding.


Niveau de qualité


Source biologique



expressed in Chem-1 cells




ligand binding assay: suitable (GTPγS)
radioligand binding assay (RLBA): suitable

N° d'accession NCBI

N° d'accession UniProt

Expédié(e)(s) dans

dry ice

Description générale

Dopamine is a catecholamine neurotransmitter that functions in the CNS to control locomotor, cognitive, emotional and neurendocrine processes, and in the periphery to modulate cardiovascular, renal and gastrointestinal processes. The biological activities of dopamine are mediated by a family of five GPCRs. The D1 and D5 subtypes couple to Gs to increase intracellular cAMP, whereas the D2, D3 and D4 subtypes couple to Gi to reduce cAMP (Missale et al., 1998). The dopamine D3 receptor is expressed in phylogenetically older regions of the brain, suggesting that it plays a role in cognitive and emotional functions. It has been the target of potential drugs for psychotic disorders and Parkinson′s disease. Chemicon′s D3 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 D3 interactions and its ligands. The membrane preparations exhibit a Kd of 0.1 nM for [125I]-Iodospiperone. With 5.0ug/well D3 membrane prep and 0.1 nM [125I]-Iodospiperone, a greater than 4-fold signal-to-background ratio was obtained.
Human D3 Receptor


Human D3 GPCR membrane preparation for Radioligand binding Assays & GTPγS binding.

Actions biochimiques/physiologiques

Protein Target: D3


Table 1. Signal:background and specific binding values obtained in a competition binding assay with varying amounts of D3 Receptor membrane prep.
10 µg/well 5 µg/well
Signal:Background 4.88 5.93
Specific Binding (cpm) 1853.7 1861.3

SPECIFICATIONS: 1 unit = 5 µg membrane preparation
Bmax: 0.32 pmol/mg
Kd: 0.1 nM


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 Tris, pH 7.4. 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 Tris, pH 7.4, 120mM NaCl, filtered and stored at 4°C
Radioligand: [125I] -Iodospiperone(Perkin Elmer # NEX284)
Wash Buffer: 50 mM Tris, pH 7.4, filtered and stored at 4°C.

Forme physique

One package contains enough membranes for at least 200 assays (units), where an unit is the amount of membrane that will yield greater than 4-fold signal:background with 125I-labeled Iodospiperone at 0.1 nM.

Liquid in packaging buffer: 50 mM Tris, pH 7.4, 10% glycerol with no preservatives.
Packaging method: Membranes protein was adjusted to the indicated concentration in packaging buffer, rapidly frozen, and stored at -80oC.

Informations légales

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

WGK Allemagne


Flash Point(F)

Not applicable

Point d'éclair C

Not applicable

Notre équipe de scientifiques dispose d'une expérience dans tous les secteurs de la recherche, notamment en sciences de la vie, science des matériaux, synthèse chimique, chromatographie, analyse et dans de nombreux autres domaines..

Contacter notre Service technique

Réseaux sociaux

LinkedIn icon
Twitter icon
Facebook Icon
Instagram Icon


Recherche. Développement. Production

Nous sommes un des tout premiers fournisseurs du secteur mondial des Sciences de la vie proposant des solutions et des services pour la recherche, le développement et la production en biotechnologies, et le développement et la production de produits thérapeutiques pharmaceutiques.

© 2021 Merck KGaA, Darmstadt, Allemagne et/ou ses sociétés affiliées. Tous droits réservés.

La reproduction d'une quelconque partie du contenu de ce site est strictement interdite sans autorisation.