ID KCNB2_BOVIN Reviewed; 911 AA.
AC Q4ZHA6;
DT 05-SEP-2006, integrated into UniProtKB/Swiss-Prot.
DT 07-JUN-2005, sequence version 1.
DT 27-MAR-2024, entry version 112.
DE RecName: Full=Potassium voltage-gated channel subfamily B member 2 {ECO:0000250|UniProtKB:Q92953};
GN Name=KCNB2 {ECO:0000250|UniProtKB:Q92953};
OS Bos taurus (Bovine).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC Eutheria; Laurasiatheria; Artiodactyla; Ruminantia; Pecora; Bovidae;
OC Bovinae; Bos.
OX NCBI_TaxID=9913;
RN [1]
RP NUCLEOTIDE SEQUENCE [MRNA].
RC TISSUE=Lens epithelium;
RA Rae J.L.;
RT "Ion channels in ocular epithelia.";
RL Submitted (APR-2005) to the EMBL/GenBank/DDBJ databases.
RN [2]
RP REVIEW.
RX PubMed=10414301; DOI=10.1111/j.1749-6632.1999.tb11293.x;
RA Coetzee W.A., Amarillo Y., Chiu J., Chow A., Lau D., McCormack T.,
RA Moreno H., Nadal M.S., Ozaita A., Pountney D., Saganich M.,
RA Vega-Saenz de Miera E., Rudy B.;
RT "Molecular diversity of K+ channels.";
RL Ann. N. Y. Acad. Sci. 868:233-285(1999).
CC -!- FUNCTION: Voltage-gated potassium channel that mediates transmembrane
CC potassium transport in excitable membranes, primarily in the brain and
CC smooth muscle cells. Channels open or close in response to the voltage
CC difference across the membrane, letting potassium ions pass in
CC accordance with their electrochemical gradient. Homotetrameric channels
CC mediate a delayed-rectifier voltage-dependent outward potassium current
CC that display rapid activation and slow inactivation in response to
CC membrane depolarization. Can form functional homotetrameric and
CC heterotetrameric channels that contain variable proportions of KCNB1;
CC channel properties depend on the type of alpha subunits that are part
CC of the channel. Can also form functional heterotetrameric channels with
CC other alpha subunits that are non-conducting when expressed alone, such
CC as KCNS1 and KCNS2, creating a functionally diverse range of channel
CC complexes. In vivo, membranes probably contain a mixture of heteromeric
CC potassium channel complexes, making it difficult to assign currents
CC observed in intact tissues to any particular potassium channel family
CC member. Contributes to the delayed-rectifier voltage-gated potassium
CC current in cortical pyramidal neurons and smooth muscle cells.
CC {ECO:0000250|UniProtKB:A6H8H5, ECO:0000250|UniProtKB:Q63099}.
CC -!- ACTIVITY REGULATION: Inhibited by quinine at micromolar levels.
CC Modestly sensitive to millimolar levels of tetraethylammonium (TEA) and
CC 4-aminopyridine (4-AP). {ECO:0000250|UniProtKB:Q63099,
CC ECO:0000250|UniProtKB:Q95167, ECO:0000305|PubMed:10414301}.
CC -!- BIOPHYSICOCHEMICAL PROPERTIES:
CC Kinetic parameters:
CC Note=Homotetrameric channels expressed in xenopus oocytes or in
CC mammalian non-neuronal cells display delayed-rectifier voltage-
CC dependent potassium currents which are activated during membrane
CC depolarization, i.e within a risetime of about 20 msec. After that,
CC inactivate very slowly. Their activation requires low threshold
CC potentials of about -20 to -30 mV, with a midpoint activation at
CC about 10 mV. For inactivation, the voltage at half-maximal amplitude
CC is about -30 mV. Channels have an unitary conductance of about 14 pS.
CC The voltage-dependence of activation and inactivation and other
CC channel characteristics vary depending on the experimental
CC conditions, the expression system and post-translational
CC modifications. {ECO:0000305|PubMed:10414301};
CC -!- SUBUNIT: Homotetramer or heterotetramer with KCNB1. Heterotetramer with
CC KCNS1 and KCNS2 (By similarity). Interacts (via phosphorylated FFAT
CC motif) with VAPA and VAPB (By similarity).
CC {ECO:0000250|UniProtKB:Q63099, ECO:0000250|UniProtKB:Q92953}.
CC -!- SUBCELLULAR LOCATION: Cell membrane {ECO:0000250|UniProtKB:Q63099};
CC Multi-pass membrane protein {ECO:0000250|UniProtKB:Q63099}. Perikaryon
CC {ECO:0000250|UniProtKB:Q63099}. Cell projection, dendrite
CC {ECO:0000250|UniProtKB:Q63099}. Note=Localized uniformly throughout
CC cell bodies and dendrites. Colocalizes with KCNB1 to high-density
CC somatodendritic clusters on cortical pyramidal neurons.
CC {ECO:0000250|UniProtKB:Q63099}.
CC -!- DOMAIN: The transmembrane segment S4 functions as a voltage-sensor and
CC is characterized by a series of positively charged amino acids at every
CC third position. Channel opening and closing is effected by a
CC conformation change that affects the position and orientation of the
CC voltage-sensor paddle formed by S3 and S4 within the membrane. A
CC transmembrane electric field that is positive inside would push the
CC positively charged S4 segment outwards, thereby opening the pore, while
CC a field that is negative inside would pull the S4 segment inwards and
CC close the pore. Changes in the position and orientation of S4 are then
CC transmitted to the activation gate formed by the inner helix bundle via
CC the S4-S5 linker region. {ECO:0000250|UniProtKB:P63142}.
CC -!- PTM: Phosphorylated (By similarity). Phosphorylation at Ser-608 of the
CC FFAT motif activates interaction with MOSPD2, VAPA and VAPB (By
CC similarity). {ECO:0000250|UniProtKB:Q63099,
CC ECO:0000250|UniProtKB:Q92953}.
CC -!- SIMILARITY: Belongs to the potassium channel family. B (Shab) (TC
CC 1.A.1.2) subfamily. Kv2.2/KCNB2 sub-subfamily. {ECO:0000305}.
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DR EMBL; DQ009866; AAY26233.1; -; mRNA.
DR RefSeq; NP_001019734.1; NM_001024563.1.
DR AlphaFoldDB; Q4ZHA6; -.
DR SMR; Q4ZHA6; -.
DR STRING; 9913.ENSBTAP00000051715; -.
DR GlyCosmos; Q4ZHA6; 1 site, No reported glycans.
DR PaxDb; 9913-ENSBTAP00000051715; -.
DR Ensembl; ENSBTAT00000053147.3; ENSBTAP00000051715.3; ENSBTAG00000040496.3.
DR GeneID; 535990; -.
DR KEGG; bta:535990; -.
DR CTD; 9312; -.
DR VEuPathDB; HostDB:ENSBTAG00000040496; -.
DR VGNC; VGNC:30431; KCNB2.
DR eggNOG; KOG3713; Eukaryota.
DR GeneTree; ENSGT00940000161902; -.
DR InParanoid; Q4ZHA6; -.
DR OMA; YNPINRA; -.
DR OrthoDB; 1478695at2759; -.
DR Reactome; R-BTA-1296072; Voltage gated Potassium channels.
DR Proteomes; UP000009136; Chromosome 14.
DR Bgee; ENSBTAG00000040496; Expressed in fornix of vagina and 54 other cell types or tissues.
DR GO; GO:0030425; C:dendrite; ISS:UniProtKB.
DR GO; GO:0043025; C:neuronal cell body; IBA:GO_Central.
DR GO; GO:0032809; C:neuronal cell body membrane; ISS:UniProtKB.
DR GO; GO:0043204; C:perikaryon; IEA:UniProtKB-SubCell.
DR GO; GO:0005886; C:plasma membrane; ISS:UniProtKB.
DR GO; GO:0008076; C:voltage-gated potassium channel complex; ISS:UniProtKB.
DR GO; GO:0005251; F:delayed rectifier potassium channel activity; ISS:UniProtKB.
DR GO; GO:0046982; F:protein heterodimerization activity; ISS:UniProtKB.
DR GO; GO:0071805; P:potassium ion transmembrane transport; ISS:UniProtKB.
DR GO; GO:0006813; P:potassium ion transport; ISS:UniProtKB.
DR GO; GO:0051260; P:protein homooligomerization; IEA:InterPro.
DR GO; GO:0072659; P:protein localization to plasma membrane; ISS:UniProtKB.
DR CDD; cd18412; BTB_POZ_KCNB2; 1.
DR Gene3D; 1.10.287.70; -; 1.
DR Gene3D; 1.20.120.350; Voltage-gated potassium channels. Chain C; 1.
DR InterPro; IPR000210; BTB/POZ_dom.
DR InterPro; IPR005821; Ion_trans_dom.
DR InterPro; IPR003968; K_chnl_volt-dep_Kv.
DR InterPro; IPR003973; K_chnl_volt-dep_Kv2.
DR InterPro; IPR005826; K_chnl_volt-dep_Kv2.2.
DR InterPro; IPR011333; SKP1/BTB/POZ_sf.
DR InterPro; IPR003131; T1-type_BTB.
DR InterPro; IPR027359; Volt_channel_dom_sf.
DR PANTHER; PTHR11537:SF134; POTASSIUM VOLTAGE-GATED CHANNEL SUBFAMILY B MEMBER 2; 1.
DR PANTHER; PTHR11537; VOLTAGE-GATED POTASSIUM CHANNEL; 1.
DR Pfam; PF02214; BTB_2; 1.
DR Pfam; PF00520; Ion_trans; 1.
DR Pfam; PF03521; Kv2channel; 1.
DR PRINTS; PR00169; KCHANNEL.
DR PRINTS; PR01515; KV22CHANNEL.
DR PRINTS; PR01491; KVCHANNEL.
DR PRINTS; PR01495; SHABCHANNEL.
DR SMART; SM00225; BTB; 1.
DR SUPFAM; SSF54695; POZ domain; 1.
DR SUPFAM; SSF81324; Voltage-gated potassium channels; 1.
PE 2: Evidence at transcript level;
KW Cell membrane; Cell projection; Glycoprotein; Ion channel; Ion transport;
KW Membrane; Phosphoprotein; Potassium; Potassium channel;
KW Potassium transport; Reference proteome; Transmembrane;
KW Transmembrane helix; Transport; Voltage-gated channel.
FT CHAIN 1..911
FT /note="Potassium voltage-gated channel subfamily B member
FT 2"
FT /id="PRO_0000248277"
FT TOPO_DOM 1..190
FT /note="Cytoplasmic"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT TRANSMEM 191..212
FT /note="Helical; Name=Segment S1"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT TOPO_DOM 213..232
FT /note="Extracellular"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT TRANSMEM 233..254
FT /note="Helical; Name=Segment S2"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT TOPO_DOM 255..265
FT /note="Cytoplasmic"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT TRANSMEM 266..284
FT /note="Helical; Name=Segment S3"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT TOPO_DOM 285..296
FT /note="Extracellular"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT TRANSMEM 297..317
FT /note="Helical; Voltage-sensor; Name=Segment S4"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT TOPO_DOM 318..332
FT /note="Cytoplasmic"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT TRANSMEM 333..354
FT /note="Helical; Name=Segment S5"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT TOPO_DOM 355..368
FT /note="Extracellular"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT INTRAMEM 369..380
FT /note="Helical; Name=Pore helix"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT INTRAMEM 381..388
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT TOPO_DOM 389..395
FT /note="Extracellular"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT TRANSMEM 396..424
FT /note="Helical; Name=Segment S6"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT TOPO_DOM 425..911
FT /note="Cytoplasmic"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT REGION 1..21
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 503..534
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 549..571
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 677..742
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 804..861
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT MOTIF 381..386
FT /note="Selectivity filter"
FT /evidence="ECO:0000250|UniProtKB:P63142"
FT MOTIF 605..611
FT /note="FFAT"
FT /evidence="ECO:0000250|UniProtKB:Q92953"
FT COMPBIAS 519..534
FT /note="Polar residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 549..564
FT /note="Polar residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 697..716
FT /note="Polar residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 804..823
FT /note="Basic and acidic residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT MOD_RES 448
FT /note="Phosphoserine"
FT /evidence="ECO:0000250|UniProtKB:Q63099"
FT MOD_RES 608
FT /note="Phosphoserine"
FT /evidence="ECO:0000250|UniProtKB:Q92953"
FT CARBOHYD 287
FT /note="N-linked (GlcNAc...) asparagine"
FT /evidence="ECO:0000255"
SQ SEQUENCE 911 AA; 102276 MW; E27553522CD3C2EB CRC64;
MAEKVPPGLN RKTSRSTLSL PPEPVDIIRS KTCSRRVKIN VGGLNHEVLW RTLDRLPRTR
LGKLRDCNTH ESLLEVCDDY NLNENEYFFD RHPGAFTSIL NFYRTGKLHM MEEMCALSFG
QELDYWGIDE IYLESCCQAR YHQKKEQMNE ELRREAETMR EREGEEFDNT CCPEKRKKLW
DLLEKPNSSV AAKILAIVSI LFIVLSTIAL SLNTLPELQE MDEFGQPNDN PQLAHVEAVC
IAWFTMEYLL RFLSSPNKWK FFKGPLNVID LLAILPYYVT IFLTESNKSV LQFQNVRRVV
QIFRIMRILR ILKLARHSTG LQSLGFTLRR SYNELGLLIL FLAMGIMIFS SLVFFAEKDE
DATKFTSIPA SFWWATITMT TVGYGDIYPK TLLGKIVGGL CCIAGVLVIA LPIPIIVNNF
SEFYKEQKRQ EKAIKRREAL ERAKRNGSIV SMNLKDAFAR SMELIDVAVE KTGESANTKG
STDDNHLSPS RWKWARKALS ETSSNKSYEN KYQEVSQKDS HEQLNNTSSS SPQHLSAQKL
EMLYNEITKT QPHSHPNPDG QEQAERPSTY EEEIEMEEVV CPQEQLAVAQ TEGVVDMKST
SSIDSFTSCA TDFTETERSP LPPPSASHLQ MKFPPDLAGL EEHQRARAPP FLALIRQKGP
TVREATPEYA PIDITVNLDA AGGPQGGPHG PLPTDCASES PKSSLKGSNP LKSRSLKVNF
KDSRGGAPPT PPSTARPLPV TAADFPLTAP QLISTILLEE TPSQGDRPLL GAEVHCQGPS
KGLTPRFPKQ KLFTFSARER RSFTEIDTGE DDDFLELQGT RRPDKQADSS PNCLTDKPSD
GRDPLREEAC VGSSSAQDTS HNCRQGIYHG VAEVKKDNSQ EGCKMENHLF APEIHSNPGD
TGYCPTRETS M
//
