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Anti-Kir2.1/KCNJ2 (extracellular) Antibody

Inward rectifier potassium channel 2, IRK1, HIRK1, LQT7, SQT3

Cat #: APC-159
Alternative Name Inward rectifier potassium channel 2, IRK1, HIRK1, LQT7, SQT3
Lyophilized Powder yes
Type: Polyclonal
Host: Rabbit
Reactivity: h, m, r
  • Peptide (C)DLDASKESKA(S)VSE, corresponding to amino acid residues 112 - 125 of rat Kir2.1 (Accession Q64273). Extracellular loop.
Accession (Uniprot) Number Q64273
Gene ID 29712
Peptide confirmation Confirmed by amino acid analysis and mass spectrometry.
Homology Rat, dog, pig - 13/14 amino acid residues identical; human - 12/14 amino acid residues identical; mouse - 11/14 amino acid residues identical.
RRID AB_2756748.
Purity Affinity purified on immobilized antigen.
Form Lyophilized powder. Reconstituted antibody contains phosphate buffered saline (PBS), pH 7.4, 1% BSA, 0.05% NaN3.
Isotype Rabbit IgG.
Storage before reconstitution The antibody ships as a lyophilized powder at room temperature. Upon arrival, it should be stored at -20°C.
Reconstitution 25 µl, 50 µl or 0.2 ml double distilled water (DDW), depending on the sample size.
Antibody concentration after reconstitution 0.8 mg/ml.
Storage after reconstitution The reconstituted solution can be stored at 4°C for up to 1 week. For longer periods, small aliquots should be stored at -20°C. Avoid multiple freezing and thawing. Centrifuge all antibody preparations before use (10000 x g 5 min).
Standard quality control of each lot Western blot analysis.
Applications: ic, if, ifc, ih, lci, wb
May also work in: ip*
Western blot
  • Western blot analysis of rat brain lysate (lanes 1 and 4), rat heart lysate (lanes 2 and 5) and mouse heart lysate (lanes 3 and 6):
    Western blot analysis of rat brain lysate (lanes 1 and 4), rat heart lysate (lanes 2 and 5) and mouse heart lysate (lanes 3 and 6):
    1-3. Anti-Kir2.1/KCNJ2 (extracellular) Antibody (#APC-159), (1:200).
    4-6. Anti-Kir2.1/KCNJ2 (extracellular) Antibody, preincubated with Kir2.1/KCNJ2 (extracellular) Blocking Peptide (#BLP-PC159).
  • Expression of Kir2.1 in mouse midbrain.
    Expression of Kir2.1 in mouse midbrain.
    Immunohistochemical staining of perfusion-fixed frozen mouse brain sections with Anti-Kir2.1/KCNJ2 (extracellular) Antibody (#APC-159), (1:200), followed by goat anti-rabbit-AlexaFluor-488. A. Staining in the dorsal midbrain region showed immunoreactivity (green) in multipolar neurons (vertical arrow). B. Pre-incubation of the antibody with Kir2.1/KCNJ2 (extracellular) Blocking Peptide (BLP-PC159), suppressed staining. Cell nuclei are stained with DAPI (blue).
Indirect flow cytometry
  • Cell surface detection of Kir2.1 in live intact human THP-1 monocytic leukemia cells:
    Cell surface detection of Kir2.1 in live intact human THP-1 monocytic leukemia cells:
    ___ Cell alone
    ___ Cells + goat-anti-rabbit-Alexa-488.
    ___ Cells + Anti-Kir2.1/KCNJ2 (extracellular) Antibody (#APC-159), 2.5µg + goat-anti-rabbit-AlexaFluor-488 secondary antibody.
Live cell imaging / Immunocytochemistry
  • Expression of Kir2.1 in rat RBL-2H3 cells
    Expression of Kir2.1 in rat RBL-2H3 cells
    Cell surface detection of Kir2.1 in live intact rat RBL-2H3 basophilic leukemia cells. A. Extracellular staining of cells using Anti-Kir2.1/KCNJ2 (extracellular) Antibody (#APC-159), (1:50), followed by goat-anti-rabbit-AlexaFluor-488 secondary antibody (green). B. Live view of the cells.
  1. Hibino, H. et al. (2010) Physiol. Rev. 90, 291.
Scientific background

Inwardly rectifying K+ (Kir) channels allow K+ to move more easily in, rather than out, of the cell. They have diverse physiological functions depending on their type and their location. There are seven Kir channel subfamilies that can be classified into four functional groups.

Kir2.1 belongs to the Kir2.x subfamily. The primary structure of Kir2.1 is comprised of two putative membrane-spanning domains (TM1 and TM2) linked by an extracellular pore-forming region (H5) and cytoplasmic amino and carboxy terminal domains. The H5 region serves as the “ion-selectivity filter” that is shared with other K+-selective ion channels with the signature sequence T-X-G-Y(F)-G.

Although initially thought to form only homomeric complexes, it is now known that Kir2.1 can function as a heterotetramer with other Kir2.x subunits both in vitro and in vivo. 

After synthesis in the endoplasmic reticulum, Kir2.1 is transported to the Golgi apparatus for post-translational modification, and then transported to the cell surface. Sequences in the NH2-terminal region have been identified as responsible for Golgi export.

Kir2.1 is expressed in skeletal and cardiac muscle and contributes to the establishment of highly negative resting potential and long-lasting action potential plateau in various cells including cardiac myocytes. Inward rectification of Kir2.1 is caused by intracellular ions such as Mg2+ and polyamines.

Andersen syndrome is caused by dysfunction of Kir2.1. Patients with Andersen syndrome exhibit cardiac arrhythmias reminiscent of long Q-T syndrome, periodic paralysis, and dysmorphic bone structure in the face and fingers.

Application key:

CBE- Cell-based ELISA, FC- Flow cytometry, ICC- Immunocytochemistry, IE- Indirect ELISA, IF- Immunofluorescence, IFC- Indirect flow cytometry, IHC- Immunohistochemistry, IP- Immunoprecipitation, LCI- Live cell imaging, N- Neutralization, WB- Western blot

Species reactivity key:

H- Human, M- Mouse, R- Rat
Last update: 11/04/2021

Anti-Kir2.1/KCNJ2 (extracellular) Antibody (#APC-159) is a highly specific antibody directed against an epitope of the rat protein. The antibody can be used in western blot, live cell imaging and live cell flow cytometry. It has been designed to recognize Kir2.1 from human, rat, and mouse samples.

For research purposes only, not for human use



Scientific Background


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