Probable inward-rectifying potassium channel. Assuming opened or closed conformations in response to the voltage difference across the membrane, the channel is activated by hyperpolarization (By similarity). The potassium channel is probably a homo- or heterotetrameric complex of pore-forming subunits. The segment S4 is probably the voltage-sensor and is characterized by a series of positively charged amino acids. The pore-forming region H5 is enclosed by the transmembrane segments S5 and S6 in the Shaker-type (1P/6TM) and contains the GYGD signature motif which seems to be involved in potassium selectivity (By similarity). The KHA domain (rich in hydrophobic and acidic residues) present in the C-terminal part is likely to be important for tetramerization. Belongs to the potassium channel family. Plant (TC 1.A.1.4) subfamily.