General Information of This Target
Target ID
BTDT00172
Target Name
Potassium voltage-gated channel subfamily B member 2 (KCNB2)
Target Bioclass
Transporter and channel
Uniprot ID
Q92953
3D Structure
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2D Sequence
3D Structure
Source
Predict by Alphafold2
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Alphafold Parameters: msa_mode: mmseqs2_uniref_env model_type: auto num_recycles: auto
Gene Name
KCNB2
Gene ID
9312
Synonym
Voltage-gated potassium channel subunit Kv2.2
Sequence
MAEKAPPGLNRKTSRSTLSLPPEPVDIIRSKTCSRRVKINVGGLNHEVLWRTLDRLPRTR
LGKLRDCNTHESLLEVCDDYNLNENEYFFDRHPGAFTSILNFYRTGKLHMMEEMCALSFG
QELDYWGIDEIYLESCCQARYHQKKEQMNEELRREAETMREREGEEFDNTCCPDKRKKLW
DLLEKPNSSVAAKILAIVSILFIVLSTIALSLNTLPELQETDEFGQLNDNRQLAHVEAVC
IAWFTMEYLLRFLSSPNKWKFFKGPLNVIDLLAILPYYVTIFLTESNKSVLQFQNVRRVV
QIFRIMRILRILKLARHSTGLQSLGFTLRRSYNELGLLILFLAMGIMIFSSLVFFAEKDE
DATKFTSIPASFWWATITMTTVGYGDIYPKTLLGKIVGGLCCIAGVLVIALPIPIIVNNF
SEFYKEQKRQEKAIKRREALERAKRNGSIVSMNLKDAFARSMELIDVAVEKAGESANTKD
SADDNHLSPSRWKWARKALSETSSNKSFENKYQEVSQKDSHEQLNNTSSSSPQHLSAQKL
EMLYNEITKTQPHSHPNPDCQEKPERPSAYEEEIEMEEVVCPQEQLAVAQTEVIVDMKST
SSIDSFTSCATDFTETERSPLPPPSASHLQMKFPTDLPGTEEHQRARGPPFLTLSREKGP
AARDGTLEYAPVDITVNLDASGSQCGLHSPLQSDNATDSPKSSLKGSNPLKSRSLKVNFK
ENRGSAPQTPPSTARPLPVTTADFSLTTPQHISTILLEETPSQGDRPLLGTEVSAPCQGP
SKGLSPRFPKQKLFPFSSRERRSFTEIDTGDDEDFLELPGAREEKQVDSSPNCFADKPSD
GRDPLREEGSVGSSSPQDTGHNCRQDIYHAVSEVKKDSSQEGCKMENHLFAPEIHSNPGD
TGYCPTRETSM

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Family
the potassium channel family
Function
Voltage-gated potassium channel that mediates transmembrane potassium transport in excitable membranes, primarily in the brain and smooth muscle cells. Channels open or close in response to the voltage difference across the membrane, letting potassium ions pass in accordance with their electrochemical gradient. Homotetrameric channels mediate a delayed-rectifier voltage-dependent outward potassium current that display rapid activation and slow inactivation in response to membrane depolarization. Can form functional homotetrameric and heterotetrameric channels that contain variable proportions of KCNB1; channel properties depend on the type of alpha subunits that are part of the channel. Can also form functional heterotetrameric channels with other alpha subunits that are non-conducting when expressed alone, such as KCNS1 and KCNS2, creating a functionally diverse range of channel complexes. In vivo, membranes probably contain a mixture of heteromeric potassium channel complexes, making it difficult to assign currents observed in intact tissues to any particular potassium channel family member. Contributes to the delayed-rectifier voltage-gated potassium current in cortical pyramidal neurons and smooth muscle cells.

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Taxonomy ID
9606
TCDB ID
1.A.1.2.25
        Click to Show/Hide the Complete Species Lineage
Kingdom: Metazoa
Phylum: Chordata
Class: Mammalia
Order: Primates
Family: Hominidae
Genus: Homo
Species: Homo sapiens
Toxin Information Related to This Target
                           Toxin Name Activity Data Type Activity Data Reference
 Toxin Info    Kappa-theraphotoxin-Pg1a Dissociation constant
2.6 nM
[1], [2], [3], [4]
 Toxin Info    Kunitz-type conkunitzin-S1 Inhibition rate . [5], [6], [7]
 Toxin Info    Potassium channel toxin gamma-KTx 2.1 Inhibition rate . [8]
 Toxin Info    Potassium channel toxin alpha-KTx 5.3 IC50
3.76 nM
[9]
References
Ref 1 Blockers of the delayed-rectifier potassium current in pancreatic beta-cells enhance glucose-dependent insulin secretion. Diabetes. 2006 Apr;55(4):1034-42. doi: 10.2337/diabetes.55.04.06.db05-0788.
Ref 2 Gating modifier peptides as probes of pancreatic beta-cell physiology. Toxicon. 2007 Feb;49(2):231-8. doi: 10.1016/j.toxicon.2006.09.012. Epub 2006 Sep 23.
Ref 3 A KV2.1 gating modifier binding assay suitable for high throughput screening. Channels (Austin). 2009 Nov;3(6):437-47. doi: 10.4161/chan.3.6.10201.
Ref 4 Solution structure of GxTX-1E, a high-affinity tarantula toxin interacting with voltage sensors in Kv2.1 potassium channels. Biochemistry. 2010 Jun 29;49(25):5134-42. doi: 10.1021/bi100246u.
Ref 5 Production of recombinant Conkunitzin-S1 in Escherichia coli. Protein Expr Purif. 2006 Jun;47(2):640-4. doi: 10.1016/j.pep.2006.01.019. Epub 2006 Feb 20.
Ref 6 Conkunitzin-S1 is the first member of a new Kunitz-type neurotoxin family. Structural and functional characterization. J Biol Chem. 2005 Jun 24;280(25):23766-70. doi: 10.1074/jbc.C500064200. Epub 2005 Apr 15.
Ref 7 Structure of conkunitzin-S1, a neurotoxin and Kunitz-fold disulfide variant from cone snail. Acta Crystallogr D Biol Crystallogr. 2006 Sep;62(Pt 9):980-90. doi: 10.1107/S0907444906021123. Epub 2006 Aug 19.
Ref 8 An ERG channel inhibitor from the scorpion Buthus eupeus. J Biol Chem. 2001 Mar 30;276(13):9868-76. doi: 10.1074/jbc.M005973200. Epub 2001 Jan 2.
Ref 9 Two conserved arginine residues from the SK3 potassium channel outer vestibule control selectivity of recognition by scorpion toxins. J Biol Chem. 2013 May 3;288(18):12544-53. doi: 10.1074/jbc.M112.433888. Epub 2013 Mar 19.
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