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UniProtKB/Swiss-Prot entry P70604


[Entry info] [Name and origin] [References] [Comments] [Cross-references] [Keywords] [Features] [Sequence] [Tools]

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Entry information
Entry name KCNN2_RAT
Primary accession number P70604
Secondary accession numbers None
Integrated into Swiss-Prot on November 16, 2001
Sequence was last modified on February 1, 1997 (Sequence version 1)
Annotations were last modified on    July 22, 2008 (Entry version 64)
Name and origin of the protein
Protein name Small conductance calcium-activated potassium channel protein 2
Synonym SK2
Gene name
Name: Kcnn2
From
Rattus norvegicus (Rat) [TaxID: 10116] 
Taxonomy Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Glires; Rodentia; Sciurognathi; Muroidea; Muridae; Murinae; Rattus.
Protein existence 1: Evidence at protein level;
References
[1]
NUCLEOTIDE SEQUENCE [MRNA].
STRAIN=Sprague-Dawley;
TISSUE=Brain;
PubMed=8781233 [NCBI, ExPASy, EBI, Israel, Japan]
Koehler M., Hirschberg B., Bond C.T., Kinzie J.M., Marrion N.V., Maylie J., Adelman J.P.;
"Small-conductance, calcium-activated potassium channels from mammalian brain.";
Science 273:1709-1714(1996).
[2]
INTERACTION WITH CALMODULIN.
DOI=10.1038/26758; PubMed=9774106 [NCBI, ExPASy, EBI, Israel, Japan]
Xia X.M., Fakler B., Rivard A.F., Wayman G., Johnson-Pais T., Keen J.E., Ishii T., Hirschberg B., Bond C.T., Lutsenko S., Maylie J., Adelman J.P.;
"Mechanism of calcium gating in small-conductance calcium-activated potassium channels.";
Nature 395:503-507(1998).
[3]
X-RAY CRYSTALLOGRAPHY (1.6 ANGSTROMS) OF 395-490 WITH CALMODULIN.
DOI=10.1038/35074145; PubMed=11323678 [NCBI, ExPASy, EBI, Israel, Japan]
Schumacher M.A., Rivard A.F., Bachinger H.P., Adelman J.P.;
"Structure of the gating domain of a Ca2+-activated K+ channel complexed with Ca2+/calmodulin.";
Nature 410:1120-1124(2001).
Comments
  • FUNCTION: Forms a voltage-independent potassium channel activated by intracellular calcium. Activation is followed by membrane hyperpolarization. Thought to regulate neuronal excitability by contributing to the slow component of synaptic afterhyperpolarization. The channel is blocked by apamin.
  • SUBUNIT: Heterooligomer. The complex is composed of 4 channel subunits each of which binds to a calmodulin subunit which regulates the channel activity through calcium-binding.
  • INTERACTION:
    P62161:Calm1; NbExp=1; IntAct=EBI-1031103, EBI-397530;
  • SUBCELLULAR LOCATION: Membrane; Multi-pass membrane protein.
  • TISSUE SPECIFICITY: Brain.
  • SIMILARITY: Belongs to the potassium channel KCNN family.
Copyright
Copyrighted by the UniProt Consortium, see http://www.uniprot.org/terms. Distributed under the Creative Commons Attribution-NoDerivs License.
Cross-references
Sequence databases
EMBL
U69882; AAB09563.1; -; mRNA.[EMBL / GenBank / DDBJ] [CoDingSequence]
RefSeq NP_062187.1; -.
UniGene Rn.44421
3D structure databases
PDB
1G4Y; X-ray; 1.60 A; B=396-487.[ExPASy / RCSB / EBI]
1KKD; NMR; -; A=396-487.[ExPASy / RCSB / EBI]
1QX7; X-ray; 3.09 A; D=411-487.[ExPASy / RCSB / EBI]
2PNV; X-ray; 2.10 A; A/B=488-526.[ExPASy / RCSB / EBI]
Detailed list of linked structures.
PDBsum 1G4Y; -.
1KKD; -.
1QX7; -.
2PNV; -.
ModBase P70604.
Protein-protein interaction databases
IntAct P70604; -.
PTM databases
PhosphoSite P70604; -.
Organism-specific databases
RGD 2963; Kcnn2.
Gene expression databases
ArrayExpress P70604; -.
GermOnline ENSRNOG00000016675; Rattus norvegicus.
Ontologies
GO
GO:0016021; Cellular component: integral to membrane (inferred from direct assay from UniProtKB).
GO:0005515; Molecular function: protein binding (inferred from physical interaction from IntAct).
GO:0016286; Molecular function: small conductance calcium-activated potassium channel activity (inferred from direct assay from UniProtKB).
GO:0006813; Biological process: potassium ion transport (inferred from direct assay from UniProtKB).
QuickGo view.
Family and domain databases
InterPro IPR004178; CaM_bd.
IPR013099; Ion_trans_2.
IPR015449; K_chnl_Ca-activ_SK.
IPR011996; K_chnl_Ca-activ_SK_con.
IPR003931; K_chnl_Ca-activ_SK_con_sub.
Graphical view of domain structure.
PANTHER PTHR10153; CaKChannelSK; 1.
Pfam PF02888; CaMBD; 1.
PF07885; Ion_trans_2; 1.
PF03530; SK_channel; 1.
Pfam graphical view of domain structure.
PRINTS PR01451; SKCHANNEL.
BLOCKS P70604.
Genome annotation databases
Ensembl ENSRNOG00000016675; Rattus norvegicus. [Contig view]
GeneID 54262; -.
KEGG rno:54262; -.
Phylogenomic databases
HOVERGEN P70604; -.
Other
LinkHub P70604; -.
ProtoNet P70604.
UniRef View cluster of proteins with at least 50% / 90% / 100% identity.
Keywords
3D-structure; Calmodulin-binding; Ion transport; Ionic channel; Membrane; Transmembrane; Transport.
Features
SEVIEWER logo Feature table viewer FT aligner logo Feature aligner
KeyFrom   To Length Description FTId
CHAIN   1   580  580     Small conductance calcium-activated potassium channel protein 2. PRO_0000155012
TRANSMEM   140   160  21     Segment S1 (Potential). 
TRANSMEM   169   189  21     Segment S2 (Potential). 
TRANSMEM   215   235  21     Segment S3 (Potential). 
TRANSMEM   257   277  21     Segment S4 (Potential). 
TRANSMEM   306   326  21     Segment S5 (Potential). 
TRANSMEM   346   366  21     Segment H5 (Potential). 
TRANSMEM   375   395  21     Segment S6 (Potential). 
REGION   413   489  77     Calmodulin-binding. 
COMPBIAS   42    46  5     Poly-Gly. 
COMPBIAS   52    56  5     Poly-Ala. 
COMPBIAS   80    85  6     Poly-Gly. 
COMPBIAS   88   103  16     Poly-Gly. 
COMPBIAS   564   567  4     Poly-Arg. 
HELIX   414   439  26      
HELIX   446   485  40      
Sequence information
Length: 580 AA [This is the length of the unprocessed precursor] Molecular weight: 63848 Da [This is the MW of the unprocessed precursor] CRC64: F71E0DAF7EEFA8D4 [This is a checksum on the sequence]
        10         20         30         40         50         60 
MSSCRYNGGV MRPLSNLSSS RRNLHEMDSE AQPLQPPASV VGGGGGASSP SAAAAASSSA 

        70         80         90        100        110        120 
PEIVVSKPEH NNSNNLALYG TGGGGSTGGG GGGGGGGGGS GHGSSSGTKS SKKKNQNIGY 

       130        140        150        160        170        180 
KLGHRRALFE KRKRLSDYAL IFGMFGIVVM VIETELSWGA YDKASLYSLA LKCLISLSTI 

       190        200        210        220        230        240 
ILLGLIIVYH AREIQLFMVD NGADDWRIAM TYERIFFICL EILVCAIHPI PGNYTFTWTA 

       250        260        270        280        290        300 
RLAFSYAPST TTADVDIILS IPMFLRLYLI ARVMLLHSKL FTDASSRSIG ALNKINFNTR 

       310        320        330        340        350        360 
FVMKTLMTIC PGTVLLVFSI SLWIIAAWTV RACERYHDQQ DVTSNFLGAM WLISITFLSI 

       370        380        390        400        410        420 
GYGDMVPNTY CGKGVCLLTG IMGAGCTALV VAVVARKLEL TKAEKHVHNF MMDTQLTKRV 

       430        440        450        460        470        480 
KNAAANVLRE TWLIYKNTKL VKKIDHAKVR KHQRKFLQAI HQLRSVKMEQ RKLNDQANTL 

       490        500        510        520        530        540 
VDLAKTQNIM YDMISDLNER SEDFEKRIVT LETKLETLIG SIHALPGLIS QTIRQQQRDF 

       550        560        570        580 
IETQMENYDK HVTYNAERSR SSSRRRRSSS TAPPTSSESS 

P70604 in FASTA format

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