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Anti-KCNN2 (KCa2.2, SK2) Antibody

SKCa2, Small conductance calcium-activated potassium channel protein 2, Apamin-sensitive small conductance Ca2+-dependent K+ channel

Cat #: APC-028
Alternative Name SKCa2, Small conductance calcium-activated potassium channel protein 2, Apamin-sensitive small conductance Ca2+-dependent K+ channel
Lyophilized Powder yes
Type: Polyclonal
Host: Rabbit
Reactivity: h, m, r
  • Peptide (C)ETQMENYDKHVTYNAERS, corresponding to amino acid residues 542-559 of rat KCNN2 (Accession P70604). Intracellular, C-terminal part.
Accession (Uniprot) Number P70604
Gene ID 54262
Peptide confirmation Confirmed by amino acid analysis and mass spectrometry.
Homology Mouse - 17/18 amino acid residues identical; human - 16/18 amino acid residues identical; chicken - 14/18 amino acid residues identical.
RRID AB_2040126.
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, ih, ip, wb
May also work in: ifc*
Western blot
  • Western blot analysis of rat brain membranes:
    Western blot analysis of rat brain membranes:
    1. Anti-KCNN2 (KCa2.2, SK2) Antibody #APC-028), (1:200).
    2. Anti-KCNN2 (KCa2.2, SK2) Antibody, preincubated with KCNN2/KCa2.2 Blocking Peptide (#BLP-PC028).
  • Human Jurkat T cells (1.5 µg/ml) (Desai, R. et al. (2000) J. Biol. Chem. 275, 39954.).

    Human and mouse heart (Xu, Y. et al. (2003) J. Biol. Chem. 278, 49085.).
  • Rat hippocampal slices (2 µg/ml) (Kramar, E.A. et al. (2004) J. Neurosci. 24, 5151.).
  • Expression of KCNN2 (SK2) in rat cerebral cortex
    Expression of KCNN2 (SK2) in rat cerebral cortex
    Immunohistochemical staining of KCNN2 channels using Anti-KCNN2 (KCa2.2, SK2) Antibody (#APC-028) in rat cerebral cortex. Picture showing the the third layer. Note that both neural (black arrows) and glial cells (green arrows) show intense staining. Reaction product is red and counterstain is H&E.
  • Rat neurons from hippocampus (1:200) (Wang, W. et al. (2011) Neuropharmacology 60, 901.).
  1. Kohler, M. et al. (1996) Science 273, 1709.
  2. Xia, X.M. et al. (1998) Nature 395, 503.
  3. Stocker, M. (2004) Nat. Rev. Neurosci. 5, 758.
Scientific background

KCa2.2 (KCNN2, SK2) is a member of the Ca2+-activated K+ channel family with small conductance that includes KCa2.1 (KCNN1, SK1) and KCa2.3 (KCNN3, SK3). The channel is voltage insensitive and is activated by intracellular Ca2+ in the submicromolar range. It has, though, a similar topology to that of voltage-dependent K+ channels (KV channels), that is six transmembrane domains and intracellular N- and C-termini. The functional channel of all the KCa2 family members is a multimeric protein composed of four pore-forming subunits.

KCa2 channels are extremely sensitive to the levels of intracellular Ca2+ and concentrations as low as 300-700 nM can open the channels very rapidly (5-15 ms). Hence, the KCa2 channels are highly sensitive and fast Ca2+ sensors resembling other known Ca2+-binding proteins. This type of Ca2+-dependent activation is achieved by the constitutive binding of the KCa2 channels to calmodulin, a highly expressed Ca2+-binding protein via a calmodulin-binding domain situated at the cytoplasmic C-terminus.

Pharmacologically, the KCa2 channels are the only known targets of the bee venom toxin Apamin, with KCa2.1 being the least sensitive, KCa2.2 the most sensitive and KCa2.3 showing intermediate sensitivity.

KCa2.2 is predominantly expressed in the nervous system although expression in endothelial cells, heart and liver has been described.

KCa2.2 is known to be involved in the regulation of neuronal excitability. They do so mainly via a phenomenon known as after hyperpolarization in which KCa2 channels open in response to increased intracellular Ca2+ concentrations that result from the entry of extracellular Ca2+ through voltage-dependent Ca2+ channels during action potentials. In this way, KCa2 channels effectively form a Ca2+-mediated feedback loop.

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: 08/01/2023

Anti-KCNN2 (KCa2.2, SK2) Antibody (#APC-028) is a highly specific antibody directed against an epitope of the rat protein. The antibody can be used in western blot, immunocytochemistry, immunohistochemistry, and immunoprecipitation applications. It has been designed to recognize KCNN2 from human, rat, and mouse samples.

For research purposes only, not for human use



Western blot citations
  1. Mouse brain lysate.
    Deng, P.Y. et al. (2019) J. Neurosci. 39, 28.
  2. Rat brain lysate (1:1000).
    Rau, A.R. et al. (2015) J. Neurosci. 35, 9730.
  3. Rat brain lysate (1:500).
    Larson, R.A. et al. (2015) Am. J. Physiol. 308, H1547.
  4. Mouse isolated mouse atria and HL-1 cell lysate (1:200).
    Yi, F. et al. (2015) J. Biol. Chem. 290, 7016.
  5. Canine LA and PV cardiomyocytes (1:200).
    Qi, X.Y. et al. (2014) Circulation 129, 430.
  6. Rat hippocampus (1:1000).
    Brewster, A.L. et al. (2013) PLoS ONE 8, e57808.
  7. Human and mouse heart.
    Xu, Y. et al. (2003) J. Biol. Chem. 278, 49085.
  8. Human Jurkat T cells (1.5 µg/ml).
    Desai, R. et al. (2000) J. Biol. Chem. 275, 39954.
Immunoprecipitation citations
  1. Rat hippocampal slices (2 µg/ml).
    Kramar, E.A. et al. (2004) J. Neurosci. 24, 5151.
Immunocytochemistry citations
  1. Rat hippocampal neurons (1:200).
    Wang, W. et al. (2011) Neuropharmacology 60, 901.
More product citations
  1. Deardorff, A.S. et al. (2013) J. Physiol. 591, 875.
  2. Gui, L. et al. (2013) Am. J. Physiol. 304, H118.
  3. Sorensen, C.M. et al. (2011) Pflugers Arch. 462, 655.
  4. Belmeguenai, A. et al. (2010) J. Neurosci. 30, 13630.
  5. Hopf, F.W. et al. (2010) Neuron 65, 682.
  6. Murthy, V. et al. (2009) Mol. Cell. Neurosci. 40, 39.
  7. Waring, D.W. et al. (2009) Endocrinology 150, 2264.
  8. Morimoto, T. et al. (2007) J. Pharmacol. Sci. 104, 94.
  9. Nakajima, H. et al. (2007) J. Neurochem. 103, 2428.
  10. Özgen, N. et al. (2007) Cardiovasc. Res. 75, 758.
  11. Brosh, I. et al. (2006) J. Neurophysiol. 96, 1728.
  12. McNeish, A.J. et al. (2006) Stroke 37, 1277.
  13. Moriguchi, S. et al. (2006) Proc. Natl. Acad. Sci. U.S.A. 103, 10811.
  14. Ren, Y. et al. (2006) J. Biol. Chem. 281, 11769.
  15. Tiwari-Woodroof. S. et al. (2006) Am. J. Physiol. 291, 687.
  16. Yamazaki, D. et al. (2006) J. Biol. Chem. 281, 38430.
  17. Conforti, L. et al. (2003) J. Immunol. 170, 695.
  18. Tamarina, N.A. et al (2003) Diabetes 52, 2000.


Scientific Background

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