9j38

Structural highlights

Disease

KCNQ5_HUMAN The disease is caused by mutations affecting the gene represented in this entry.

Function

KCNQ5_HUMAN Associates with KCNQ3 to form a potassium channel which contributes to M-type current, a slowly activating and deactivating potassium conductance which plays a critical role in determining the subthreshold electrical excitability of neurons. Therefore, it is important in the regulation of neuronal excitability. May contribute, with other potassium channels, to the molecular diversity of a heterogeneous population of M-channels, varying in kinetic and pharmacological properties, which underlie this physiologically important current. Insensitive to tetraethylammonium, but inhibited by barium, linopirdine and XE991. Activated by niflumic acid and the anticonvulsant retigabine. As the native M-channel, the potassium channel composed of KCNQ3 and KCNQ5 is also suppressed by activation of the muscarinic acetylcholine receptor CHRM1.^{[1] [2] [3]}

References

1. ↑ Lerche C, Scherer CR, Seebohm G, Derst C, Wei AD, Busch AE, Steinmeyer K. Molecular cloning and functional expression of KCNQ5, a potassium channel subunit that may contribute to neuronal M-current diversity. J Biol Chem. 2000 Jul 21;275(29):22395-400. doi: 10.1074/jbc.M002378200. PMID:10787416 doi:http://dx.doi.org/10.1074/jbc.M002378200
2. ↑ Wickenden AD, Zou A, Wagoner PK, Jegla T. Characterization of KCNQ5/Q3 potassium channels expressed in mammalian cells. Br J Pharmacol. 2001 Jan;132(2):381-4. PMID:11159685 doi:http://dx.doi.org/10.1038/sj.bjp.0703861
3. ↑ Lehman A, Thouta S, Mancini GMS, Naidu S, van Slegtenhorst M, McWalter K, Person R, Mwenifumbo J, Salvarinova R, Guella I, McKenzie MB, Datta A, Connolly MB, Kalkhoran SM, Poburko D, Friedman JM, Farrer MJ, Demos M, Desai S, Claydon T. Loss-of-Function and Gain-of-Function Mutations in KCNQ5 Cause Intellectual Disability or Epileptic Encephalopathy. Am J Hum Genet. 2017 Jul 6;101(1):65-74. doi: 10.1016/j.ajhg.2017.05.016. Epub, 2017 Jun 29. PMID:28669405 doi:http://dx.doi.org/10.1016/j.ajhg.2017.05.016