MetaCyc Transporter: potassium channel

Gene: KAT1 Accession Number: G-11123 (MetaCyc)

Synonyms: At5g46240, potassium channel KAT1, potassium transporter KAT1

Species: Arabidopsis thaliana col

Potassium ions are essential for plant nutrition and play an important role in osmoregulation [Zeilinger94]. Potassium is used for regulation of cell membrane potential and turgor pressure. For example, higher plants require potassium as an osmoticum in the opening of stomata.

Plants possess different kinds of potassium transporters differing in their energy requirements, their selectivity, and their tissue specific localization. Three types of voltage-dependent potassium channels have been demonstrated in guard cells [Basset95].

A cDNA clone of the KAT1 gene was isolated from Arabidopsis thaliana. When recombinantly expressed in Xenopus oocytes, a functional hyperpolarization-activated K+ channel was expressed. The channels encoded by KAT1 are highly selective for K+ over other monovalent cations and are blocked by tetraethylammonium and barium, with typical functional characteristics of inward-rectifying K+ channels in eukaryotic cells [Schachtman92].

Molecular Weight of Polypeptide: 78.3 kD (from nucleotide sequence), 78.3 kD (experimental) [Schachtman92 ]

Unification Links: ArrayExpress:Q39128 , PhylomeDB:Q39128 , Pride:Q39128 , Protein Model Portal:Q39128 , SMR:Q39128 , String:Q39128 , UniProt:Q39128

Relationship Links: InterPro:IN-FAMILY:IPR000595 , InterPro:IN-FAMILY:IPR003938 , InterPro:IN-FAMILY:IPR005821 , InterPro:IN-FAMILY:IPR014710 , InterPro:IN-FAMILY:IPR018490 , InterPro:IN-FAMILY:IPR021789 , Pfam:IN-FAMILY:PF00027 , Pfam:IN-FAMILY:PF00520 , Pfam:IN-FAMILY:PF11834 , Prints:IN-FAMILY:PR01463 , Prosite:IN-FAMILY:PS50042 , Prosite:IN-FAMILY:PS51490 , Smart:IN-FAMILY:SM00100

Gene-Reaction Schematic: ?

Gene-Reaction Schematic

Created 09-Mar-2009 by Pujar A , Boyce Thompson Institute

Enzymatic reaction of: potassium channel

Transport reaction diagram for potassium channel


Basset95: Basset M, Conejero G, Lepetit M, Fourcroy P, Sentenac H (1995). "Organization and expression of the gene coding for the potassium transport system AKT1 of Arabidopsis thaliana." Plant Mol Biol 29(5);947-58. PMID: 8555458

Schachtman92: Schachtman DP, Schroeder JI, Lucas WJ, Anderson JA, Gaber RF (1992). "Expression of an inward-rectifying potassium channel by the Arabidopsis KAT1 cDNA." Science 258(5088);1654-8. PMID: 8966547

Zeilinger94: Zeilinger C (1994). "Isolation of a potassium-selective ion channel from the plasma membrane of the broad bean Vicia faba L." FEBS Lett 348(3);278-82. PMID: 8034054

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Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
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