MetaCyc Transporter: stelar K+ outward rectifying channel

Gene: SKOR Accession Number: G-11131 (MetaCyc)

Synonyms: At3g02850, potassium channel SKOR, stelar K+ outward rectifying channel

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

A cDNA clone that was isolated from Arabidopsis thaliana encodes a Shaker-like outward K+ channel. The gene, which was named SKOR, has a cyclic nucteotide binding domain. Expression in Xenopus oocytes showed that it is an outward rectifying K+ channel. An internal pH decrease from 7.4 to 7.2 induced a strong (ca. 80%) voltage-independent decrease of the macroscopic SKOR current. An external acidification from 7.4 to 6.4 had similar effects.

The expression of SKOR is restricted to the root stelar tissues, and is strongly inhibited by the stress phytohormone abscisic acid [Lacombe00].

Molecular Weight of Polypeptide: 93.8 kD (from nucleotide sequence), 93.8 kD (experimental) [Pilot03 ]

Unification Links: ArrayExpress:Q9M8S6 , PhylomeDB:Q9M8S6 , Pride:Q9M8S6 , Protein Model Portal:Q9M8S6 , SMR:Q9M8S6 , String:Q9M8S6 , UniProt:Q9M8S6

Relationship Links: InterPro:IN-FAMILY:IPR000595 , InterPro:IN-FAMILY:IPR002110 , InterPro:IN-FAMILY:IPR003938 , InterPro:IN-FAMILY:IPR005821 , InterPro:IN-FAMILY:IPR014710 , InterPro:IN-FAMILY:IPR018490 , InterPro:IN-FAMILY:IPR020683 , InterPro:IN-FAMILY:IPR021789 , Pfam:IN-FAMILY:PF00023 , Pfam:IN-FAMILY:PF00027 , Pfam:IN-FAMILY:PF00520 , Pfam:IN-FAMILY:PF11834 , Prints:IN-FAMILY:PR01415 , Prints:IN-FAMILY:PR01463 , Prosite:IN-FAMILY:PS50042 , Prosite:IN-FAMILY:PS50088 , Prosite:IN-FAMILY:PS50297 , Prosite:IN-FAMILY:PS51490 , Smart:IN-FAMILY:SM00100 , Smart:IN-FAMILY:SM00248

Gene-Reaction Schematic: ?

Gene-Reaction Schematic

Created 10-Mar-2009 by Pujar A , Boyce Thompson Institute

Enzymatic reaction of: stelar K+ outward rectifying channel

Transport reaction diagram for stelar K+ outward rectifying channel


Lacombe00: Lacombe B, Pilot G, Gaymard F, Sentenac H, Thibaud JB (2000). "pH control of the plant outwardly-rectifying potassium channel SKOR." FEBS Lett 466(2-3);351-4. PMID: 10682858

Pilot03: Pilot G, Gaymard F, Mouline K, Cherel I, Sentenac H (2003). "Regulated expression of Arabidopsis shaker K+ channel genes involved in K+ uptake and distribution in the plant." Plant Mol Biol 51(5);773-87. PMID: 12678562

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
Page generated by SRI International Pathway Tools version 19.0 on Fri Oct 9, 2015, biocyc14.