Channel-anchored protein kinase CK2 and protein phosphatase 1 reciprocally regulate KCNQ2-containing M-channels via phosphorylation of calmodulin
M-type potassium channels, encoded by the KCNQ family genes (KCNQ2-5), require calmodulin as an essential co-factor. Calmodulin bound to the KCNQ2 subunit regulates channel trafficking and stabilizes channel activity. We demonstrate that phosphorylation of calmodulin by protein kinase CK2 (casein kinase 2) rapidly and reversibly modulated KCNQ2 current. CK2-mediated phosphorylation of calmodulin strengthened its binding to KCNQ2 channel, caused resistance to phosphatidylinositol 4,5-bisphosphate depletion, and increased KCNQ2 current amplitude. Accordingly, application of CK2-selective inhibitors suppressed KCNQ2 current. This suppression was prevented by co-expression of CK2 phosphomimetic calmodulin mutants or pretreatment with a protein phosphatase inhibitor, calyculin A. We also demonstrated that functional CK2 and protein phosphatase 1 (PP1) were selectively tethered to the KCNQ2 subunit. We identified a functional KVXF consensus site for PP1 binding in the N-terminal tail of KCNQ2 subunit: mutation of this site augmented current density. CK2 inhibitor treatment suppressed M-current in rat superior cervical ganglion neurons, an effect negated by overexpression of phosphomimetic calmodulin or pretreatment with calyculin A Furthermore, CK2 inhibition diminished the medium after hyperpolarization by suppressing the M-current. These findings suggest that CK2-mediated phosphorylation of calmodulin regulates the M-current, which is tonically regulated by CK2 and PP1 anchored to the KCNQ2 channel complex.
| Medienart: |
E-Artikel |
|---|
| Erscheinungsjahr: |
2014 |
|---|---|
| Erschienen: |
2014 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:289 |
|---|---|
| Enthalten in: |
The Journal of biological chemistry - 289(2014), 16 vom: 18. Apr., Seite 11536-11544 |
| Sprache: |
Englisch |
|---|
| Beteiligte Personen: |
Kang, Seungwoo [VerfasserIn] |
|---|
| Links: |
|---|
| Anmerkungen: |
Date Completed 04.06.2014 Date Revised 21.10.2021 published: Print-Electronic Citation Status MEDLINE |
|---|
| doi: |
10.1074/jbc.M113.528497 |
|---|
| funding: |
|
|---|---|
| Förderinstitution / Projekttitel: |
|
| PPN (Katalog-ID): |
NLM236378597 |
|---|
| LEADER | 01000naa a22002652 4500 | ||
|---|---|---|---|
| 001 | NLM236378597 | ||
| 003 | DE-627 | ||
| 005 | 20231224105438.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 231224s2014 xx |||||o 00| ||eng c | ||
| 024 | 7 | |a 10.1074/jbc.M113.528497 |2 doi | |
| 028 | 5 | 2 | |a pubmed24n0788.xml |
| 035 | |a (DE-627)NLM236378597 | ||
| 035 | |a (NLM)24627475 | ||
| 035 | |a (PII)S0021-9258(20)48367-X | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rakwb | ||
| 041 | |a eng | ||
| 100 | 1 | |a Kang, Seungwoo |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Channel-anchored protein kinase CK2 and protein phosphatase 1 reciprocally regulate KCNQ2-containing M-channels via phosphorylation of calmodulin |
| 264 | 1 | |c 2014 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ƒaComputermedien |b c |2 rdamedia | ||
| 338 | |a ƒa Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Date Completed 04.06.2014 | ||
| 500 | |a Date Revised 21.10.2021 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a M-type potassium channels, encoded by the KCNQ family genes (KCNQ2-5), require calmodulin as an essential co-factor. Calmodulin bound to the KCNQ2 subunit regulates channel trafficking and stabilizes channel activity. We demonstrate that phosphorylation of calmodulin by protein kinase CK2 (casein kinase 2) rapidly and reversibly modulated KCNQ2 current. CK2-mediated phosphorylation of calmodulin strengthened its binding to KCNQ2 channel, caused resistance to phosphatidylinositol 4,5-bisphosphate depletion, and increased KCNQ2 current amplitude. Accordingly, application of CK2-selective inhibitors suppressed KCNQ2 current. This suppression was prevented by co-expression of CK2 phosphomimetic calmodulin mutants or pretreatment with a protein phosphatase inhibitor, calyculin A. We also demonstrated that functional CK2 and protein phosphatase 1 (PP1) were selectively tethered to the KCNQ2 subunit. We identified a functional KVXF consensus site for PP1 binding in the N-terminal tail of KCNQ2 subunit: mutation of this site augmented current density. CK2 inhibitor treatment suppressed M-current in rat superior cervical ganglion neurons, an effect negated by overexpression of phosphomimetic calmodulin or pretreatment with calyculin A Furthermore, CK2 inhibition diminished the medium after hyperpolarization by suppressing the M-current. These findings suggest that CK2-mediated phosphorylation of calmodulin regulates the M-current, which is tonically regulated by CK2 and PP1 anchored to the KCNQ2 channel complex | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, N.I.H., Extramural | |
| 650 | 4 | |a CK2 | |
| 650 | 4 | |a Calmodulin | |
| 650 | 4 | |a KCNQ2 | |
| 650 | 4 | |a PP1 | |
| 650 | 4 | |a Potassium Channels | |
| 650 | 4 | |a Protein Kinases | |
| 650 | 4 | |a Protein Phosphorylation | |
| 650 | 7 | |a Calmodulin |2 NLM | |
| 650 | 7 | |a Enzyme Inhibitors |2 NLM | |
| 650 | 7 | |a KCNQ2 Potassium Channel |2 NLM | |
| 650 | 7 | |a Kcnq2 protein, rat |2 NLM | |
| 650 | 7 | |a Marine Toxins |2 NLM | |
| 650 | 7 | |a Oxazoles |2 NLM | |
| 650 | 7 | |a calyculin A |2 NLM | |
| 650 | 7 | |a 7D07U14TK3 |2 NLM | |
| 650 | 7 | |a Casein Kinase II |2 NLM | |
| 650 | 7 | |a EC 2.7.11.1 |2 NLM | |
| 650 | 7 | |a Protein Phosphatase 1 |2 NLM | |
| 650 | 7 | |a EC 3.1.3.16 |2 NLM | |
| 700 | 1 | |a Xu, Mingxuan |e verfasserin |4 aut | |
| 700 | 1 | |a Cooper, Edward C |e verfasserin |4 aut | |
| 700 | 1 | |a Hoshi, Naoto |e verfasserin |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t The Journal of biological chemistry |d 1945 |g 289(2014), 16 vom: 18. Apr., Seite 11536-11544 |w (DE-627)NLM000004995 |x 1083-351X |7 nnns |
| 773 | 1 | 8 | |g volume:289 |g year:2014 |g number:16 |g day:18 |g month:04 |g pages:11536-11544 |
| 856 | 4 | 0 | |u http://dx.doi.org/10.1074/jbc.M113.528497 |3 Volltext |
| 912 | |a GBV_USEFLAG_A | ||
| 912 | |a GBV_NLM | ||
| 951 | |a AR | ||
| 952 | |d 289 |j 2014 |e 16 |b 18 |c 04 |h 11536-11544 | ||