Updating In Vivo and In Vitro Phosphorylation and Methylation Sites of Voltage-Gated Kv7.2 Potassium Channels.

Abstract:

:Voltage-gated Kv7.2 potassium channels regulate neuronal excitability. The gating of these channels is tightly controlled by various mediators and neurotransmitters acting via G protein-coupled receptors; the underlying signaling cascades involve phosphatidylinositol-4,5-bisphosphate (PIP2 ), Ca2+ /calmodulin, and phosphorylation. Recent studies found that the PIP2 sensitivity of Kv7.2 channels is affected by two posttranslational modifications, phosphorylation and methylation, harboured within putative PIP2 -binding domains. In this study, we updated phosphorylation and methylation sites in Kv7.2 either heterologously expressed in mammalian cells or as GST-fusion proteins exposed to recombinant protein kinases by using LC-MS/MS. In vitro kinase assays revealed that CDK5, protein kinase C (PKC) alpha, PKA, p38 MAPK, CamKIIα, and GSK3β could mediate phosphorylation. Taken together, we provided a comprehensive map of phosphorylation and methylation in Kv7.2 within protein-protein and protein-lipid interaction domains. This may help to interpret the functional roles of individual PTM sites in Kv7.2 channels. All MS data are available via ProteomeXchange with the identifier PXD005567.

journal_name

Proteomics

journal_title

Proteomics

authors

Erdem FA,Salzer I,Heo S,Chen WQ,Jung G,Lubec G,Boehm S,Yang JW

doi

10.1002/pmic.201700015

subject

Has Abstract

pub_date

2017-10-01 00:00:00

issue

19

eissn

1615-9853

issn

1615-9861

journal_volume

17

pub_type

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