Gene: AT4G18290 (Arabidopsis thaliana)

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Gene Identifier
Transcript Identifier
Gene Type
Coding gene
4 : 10115418-10118477 : positive


Gene family
(197 genes in 16 species)
specific family
Duplication type
Block duplicate

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potassium channel in Arabidopsis thaliana 2
Curated Summary
Encodes KAT2, a member of the Shaker family potassium ion (K+) channel. Critical to stomatal opening induced by blue light. Critical to circadian rhythm of stomatal opening. Involved in plant development in response to high light intensity. Under high light intensity, the mutant plant produced less biomass compared to the wild type. The Shaker family K+ ion channels include five groups based on phylogenetic analysis (FEBS Letters (2007) 581: 2357): I (inward rectifying channel): AKT1 (AT2G26650), AKT5 (AT4G32500) and SPIK (also known as AKT6, AT2G25600); II (inward rectifying channel): KAT1 (AT5G46240) and KAT2 (AT4G18290); III (weakly inward rectifying channel): AKT2 (AT4G22200); IV (regulatory subunit involved in inwardly rectifying conductance formation): KAT3 (also known as AtKC1, AT4G32650); V (outward rectifying channel): SKOR (AT3G02850) and GORK (AT5G37500).
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Identifier Name
aliaspotassium channel in Arabidopsis thaliana 2





Biological Process

GO termEvidence(s)ProviderDescriptionSource
GO:0007623IMPUniProtcircadian rhythm1 2 3 4
GO:0009644IMPUniProtresponse to high light intensity1 2 3 4
GO:0010118IMPUniProtstomatal movement1 2 3 4
GO:0055085IEAInterProtransmembrane transport
GO:0006813IEAInterPropotassium ion transport
GO:0006811IEAInterProion transport

Molecular Function

GO termEvidence(s)ProviderDescriptionSource
GO:0005242IDA, ISSGene Ontologyinward rectifier potassium channel activity1 2
GO:0030551ISSGene Ontologycyclic nucleotide binding1
GO:0005515IPIGene Ontologyprotein binding1
GO:0005249IEAUniProtvoltage-gated potassium channel activity1 2 3
GO:0005216IEAInterProion channel activity
GO:0015079IEAPLAZA Homologypotassium ion transmembrane transporter activityHOM03M000275
GO:0022843IEAPLAZA Homologyvoltage-gated cation channel activityHOM03M000275
GO:0022803IEAPLAZA Homologypassive transmembrane transporter activityHOM03M000275
GO:0022839IEAPLAZA Homologyion gated channel activityHOM03M000275
GO:0005244IEAPLAZA Homologyvoltage-gated ion channel activityHOM03M000275
GO:0005261IEAPLAZA Homologycation channel activityHOM03M000275
GO:0022836IEAPLAZA Homologygated channel activityHOM03M000275
GO:0022838IEAPLAZA Homologysubstrate-specific channel activityHOM03M000275
GO:0022832IEAPLAZA Homologyvoltage-gated channel activityHOM03M000275
GO:0005267IEAPLAZA Homologypotassium channel activityHOM03M000275
GO:0015267IEAPLAZA Homologychannel activityHOM03M000275

Cellular Component

GO termEvidence(s)ProviderDescriptionSource
GO:0005634ISMGene Ontologynucleus1
GO:0005886ISSGene Ontologyplasma membrane1
GO:0016021IEAUniProtintegral to membrane1 2 3

Color Legend

Experimental Evidence
Electronic Evidence
Computational Reviewed Evidence
GO Sources:   Primary     Orthology     Homology  
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InterPro Description
IPR014710RmlC-like jelly roll fold
IPR003938Potassium channel, voltage-dependent, EAG/ELK/ERG
IPR000595Cyclic nucleotide-binding domain
IPR021789Potassium channel, plant-type
IPR005821Ion transport domain
IPR018490Cyclic nucleotide-binding-like

Mapman id Description
No SignalP domains detected for this gene.