Domain

Potassium channel, plant-type (IPR021789)

Short name: K_channel_plant

Domain relationships

None.

Description

Potassium channels take part in important processes of higher plants, including opening and closing of stomatal pores and leaf movement. Inward rectifying potassium (K(+)in) channels play an important role in turgor regulation and ion uptake in higher plants. All of them comprise, from their N-terminal to their C-terminal ends: a short hydrophilic region, a hydrophobic region structurally analogous and partially homologous to the transmembrane domain of voltage-gated animal channels from the Shaker superfamily, a putative cyclic nucleotide-binding domain, and a conserved C-terminal KHA domain. Between these last two regions, some of them (AKT1, AKT2 and SKT1) contain an ankyrin-repeat domain with six repeats homologous to those of human erythrocyte ankyrin.

This entry represents the KHA domain which is unique to plant K(+)in channels. The KHA domain contains two high-homology blocks enriched for hydrophobic and acidic residues, respectively. The KHA domain is essential for interaction of plant K(+)in channels. The KHA domain mediates tetramerization and/or stabilisation of the heteromers [PMID: 9202139, PMID: 9218788, PMID: 11849592].

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
PROSITE profiles
Pfam