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.
journal_name
Proc Natl Acad Sci U S Aauthors
Leonard AS,Yermolaieva O,Hruska-Hageman A,Askwith CC,Price MP,Wemmie JA,Welsh MJdoi
10.1073/pnas.252782799keywords:
subject
Has Abstractpub_date
2003-02-18 00:00:00pages
2029-34issue
4eissn
0027-8424issn
1091-6490pii
252782799journal_volume
100pub_type
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