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Anti-GIRK3 (Kir3.3) Antibody

G protein-activated inward rectifier potassium channel 3, KCNJ9

Cat #: APC-038
Alternative Name G protein-activated inward rectifier potassium channel 3, KCNJ9
  • KO Validated
  • Lyophilized Powder yes
    Type: Polyclonal
    Host: Rabbit
    Reactivity: h, m, r
    • Peptide (C)RLDAHLYWSIPSRLDEKV, corresponding to residues 344-361 of rat KCNJ9 (Accession Q63511). Intracellular, C-terminus.
    Accession (Uniprot) Number Q63511
    Gene ID 116560
    Peptide confirmation Confirmed by amino acid analysis and mass spectrometry.
    Homology Mouse, human - identical.
    RRID AB_2040117.
    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 0.75 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, ih, wb
    May also work in: ifc*, ip*
    Western blot
    • Western blot analysis of rat brain membranes:
      Western blot analysis of rat brain membranes:
      1. Anti-GIRK3 (Kir3.3) Antibody (#APC-038), (1:200).
      2. Anti-GIRK3 (Kir3.3) Antibody, preincubated with GIRK3/Kir3.3 Blocking Peptide (#BLP-PC038).
    • Rat brain sections.
    • Expression of GIRK3 in mouse deep cerebellar nuclei (DCN).
      Expression of GIRK3 in mouse deep cerebellar nuclei (DCN).
      Immunohistochemical staining of perfusion-fixed frozen mouse brain sections with Anti-GIRK3 (Kir3.3) Antibody (#APC-038), (1:400), followed by goat anti-rabbit-Alexa-488. A. GIRK3 immunoreactivity (green) appears in DCN cells (arrows). B. Pre-incubation of the antibody with GIRK3 (Kir3.3) Blocking Peptide (#BLP-PC038), suppressed staining. Cell nuclei are stained with DAPI (blue).
    1. Dascal, N. (1997) Cell Signal 9, 551.
    2. Mark, M.D. et al. (2000) Eur. J. Biochem. 267, 5830.
    3. Torrecilla, M. et al. (2002) J. Neurosci. 22, 4328.
    Scientific background

    Kir3.3 (or G-protein regulated Inward-Rectifier K+ channel, GIRK3) is a member of the family of inward rectifying K+ channels. The family includes 15 members that are structurally and functionally different from the voltage-dependent K+ channels.

    The family’s topology consists of two transmembrane domains that flank a single and highly conserved pore region with intracellular N- and C-termini. As is the case for the voltage-dependent K+ channels the functional unit for the Kir channels is composed of four subunit that can assembly as either homo or heterotetramers.

    Kir channels are characterized by a K+ efflux that is limited by depolarizing membrane potentials thus making them essential for controlling resting membrane potential and K+ homeostasis.

    Kir3.3 is a member of the Kir3.x subfamily that includes four members (Kir3.1- Kir3.4). The Kir3 family is characterized by the fact that the channels can be activated by neurotransmitters and other factors acting via the activation of G-protein coupled receptors. Binding of the corresponding ligand to the G-protein receptor induces the dissociation of Ga-GTP from the Gbg dimer. The latter directly binds to Kir3 and activates the channel.1,2

    Kir3.3 is mainly expressed in the brain, were it co-assembles with Kir3.1 or Kir3.2. The functional impact of Kir3.3 is less well understood than the other Kir3 channels. However, heteromers composed of Kir3.2 and Kir3.3 were found to be primarily responsible for the opioid-induced current and hyperpolarization observed in mouse locus ceruleus (LC) neurons.3

    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: 06/11/2022

    Anti-GIRK3 (Kir3.3) Antibody (#APC-038) is a highly specific antibody directed against an epitope of the rat protein. The antibody can be used in western blot, immunohistochemistry, and immunocytochemistry applications. It has been designed to recognize Kir3.3 from human, rat, and mouse samples.

    For research purposes only, not for human use



    KO validation citations
    1. Western blot analysis of mouse brain lysate. Tested in GIRK3-/- mice.
      Koyrakh, L. et al. (2005) J. Neurosci. 25, 11468.
    Western blot citations
    1. Mouse brain lysate. Also tested in GIRK3-/- mice.
      Koyrakh, L. et al. (2005) J. Neurosci. 25, 11468.
    Immunohistochemistry citations
    1. Mouse pancreas sections.
      Iwanir, S. and Reuveny, E. (2008) Pflugers Arch. 456, 1097.
    Immunocytochemistry citations
    1. Mouse INS-IE cells.
      Iwanir, S. and Reuveny, E. (2008) Pflugers Arch. 456, 1097.
    More product citations
    1. Booker, S.A. et al. (2016) Cereb. Cortex pii: bhw090.
    2. Del Burgo, L.S. et al. (2008) J. Comp. Neurol. 510, 581.


    Scientific Background

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