RGD Reference Report - Inward rectifier potassium channel Kir2.2 is associated with synapse-associated protein SAP97. - Rat Genome Database

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Inward rectifier potassium channel Kir2.2 is associated with synapse-associated protein SAP97.

Authors: Leonoudakis, D  Mailliard, W  Wingerd, K  Clegg, D  Vandenberg, C 
Citation: Leonoudakis D, etal., J Cell Sci. 2001 Mar;114(Pt 5):987-98.
RGD ID: 1581466
Pubmed: PMID:11181181   (View Abstract at PubMed)

The strong inwardly rectifying potassium channels Kir2.x are involved in maintenance and control of cell excitability. Recent studies reveal that the function and localization of ion channels are regulated by interactions with members of the membrane-associated guanylate kinase (MAGUK) protein family. To identify novel interacting MAGUK family members, we constructed GST-fusion proteins with the C termini of Kir2.1, Kir2.2 and Kir2.3. GST affinity-pulldown assays from solubilized rat cerebellum and heart membrane proteins revealed an interaction between all three Kir2.x C-terminal fusion proteins and the MAGUK protein synapse-associated protein 97 (SAP97). A truncated form of the C-terminal GST-Kir2.2 fusion protein indicated that the last three amino acids (S-E-I) are essential for association with SAP97. Affinity interactions using GST-fusion proteins containing the modular domains of SAP97 demonstrate that the second PSD-95/Dlg/ZO-1 (PDZ) domain is sufficient for interaction with Kir2.2. Coimmunoprecipitations demonstrated that endogenous Kir2.2 associates with SAP97 in rat cerebellum and heart. Additionally, phosphorylation of the Kir2.2 C terminus by protein kinase A inhibited the association with SAP97. In rat cardiac ventricular myocytes, Kir2.2 and SAP97 colocalized in striated bands corresponding to T-tubules. In rat cerebellum, Kir2.2 was present in a punctate pattern along SAP97-positive processes of Bergmann glia in the molecular layer, and colocalized with astrocytes and granule cells in the granule cell layer. These results identify a direct association of Kir2.1, Kir2.2 and Kir2.3 with the MAGUK family member SAP97 that may form part of a macromolecular signaling complex in many different tissues.

Gene Ontology Annotations    Click to see Annotation Detail View

Cellular Component
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
T-tubule  IDA 1581466; 1581466 RGD 

Molecular Function
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
PDZ domain binding  IPIDlg1 (Rattus norvegicus)1581466 RGD 
transmembrane transporter binding  IPIKcnj12 (Rattus norvegicus)1581466protein C-terminus bindingRGD 
transmembrane transporter binding  IPIKcnj2 (Mus musculus)1581466protein C-terminus bindingRGD 
transmembrane transporter binding  IPIKCNJ4 (Homo sapiens)1581466protein C-terminus bindingRGD 

Objects Annotated

Genes (Rattus norvegicus)
Dlg1  (discs large MAGUK scaffold protein 1)
Kcnj12  (potassium inwardly-rectifying channel, subfamily J, member 12)


Additional Information