cAMP-dependent protein kinase phosphorylation of the acid-sensing ion channel-1 regulates its binding to the protein interacting with C-kinase-1.

Abstract:

:The acid-sensing ion channel-1 (ASIC1) contributes to synaptic plasticity and may influence the response to cerebral ischemia and acidosis. We found that cAMP-dependent protein kinase phosphorylated heterologously expressed ASIC1 and endogenous ASIC1 in brain slices. ASIC1 also showed significant phosphorylation under basal conditions. Previous studies showed that the extreme C-terminal residues of ASIC1 bind the PDZ domain of the protein interacting with C-kinase-1 (PICK1). We found that protein kinase A phosphorylation of Ser-479 in the ASIC1 C terminus interfered with PICK1 binding. In contrast, minimizing phosphorylation or mutating Ser-479 to Ala enhanced PICK1 binding. Phosphorylation-dependent disruption of PICK1 binding reduced the cellular colocalization of ASIC1 and PICK1. Thus, the ASIC1 C terminus contains two sites that influence its binding to PICK1. Regulation of this interaction by phosphorylation provides a mechanism to control the cellular localization of ASIC1.

authors

Leonard AS,Yermolaieva O,Hruska-Hageman A,Askwith CC,Price MP,Wemmie JA,Welsh MJ

doi

10.1073/pnas.252782799

keywords:

subject

Has Abstract

pub_date

2003-02-18 00:00:00

pages

2029-34

issue

4

eissn

0027-8424

issn

1091-6490

pii

252782799

journal_volume

100

pub_type

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