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TRANSPORTERS FROM HUMANS:
Transporter Information:
Name: potassium voltage-gated channel, subfamily G, member 4
Symbol: KCNG4
TC: 1.A.1.2.1
Locations: 16q24.1
Aliases: Kv6.4, Kv6.3
GenBank: AF348984
Swiss-Prot: Q8TDN1
Accession Number: NM_172347
LocusLink93107
OMIM607603
PubMed (12060745): Ottschytsch N, Raes A, Van Hoorick D, Snyders DJ. Obligatory heterotetramerization of three previously uncharacterized Kv channelalpha-subunits identified in the human genome.Proc Natl Acad Sci U S A. 2002 Jun 11;99(12):7986-91. PMID: 12060745 [PubMed - indexed for MEDLINE]

Voltage-gated K(+) channels control excitability in neuronal and various other tissues. We identified three unique alpha-subunits of voltage-gated K(+)-channels in the human genome. Analysis of the full-length sequences indicated that one represents a previously uncharacterized member of the Kv6 subfamily, Kv6.3, whereas the others are the first members of two unique subfamilies, Kv10.1 and Kv11.1. Although they have all of the hallmarks of voltage-gated K(+) channel subunits, they did not produce K(+) currents when expressed in mammalian cells. Confocal microscopy showed that Kv6.3, Kv10.1, and Kv11.1 alone did not reach the plasma membrane, but were retained in the endoplasmic reticulum. Yeast two-hybrid experiments failed to show homotetrameric interactions, but showed interactions with Kv2.1, Kv3.1, and Kv5.1. Co-expression of each of the previously uncharacterized subunits with Kv2.1 resulted in plasma membrane localization with currents that differed from typical Kv2.1 currents. This heteromerization was confirmed by co-immunoprecipitation. The Kv2 subfamily consists of only two members and uses interaction with "silent subunits" to diversify its function. Including the subunits described here, the "silent subunits" represent one-third of all Kv subunits, suggesting that obligatory heterotetramer formation is more widespread than previously thought.