Abstract：
:Homomeric assembly of Kir5.1, an inward-rectifying K+ channel subunit, is believed to be nonfunctional, although the subunit exists abundantly in the brain. We show that HEK293T cells cotransfected with Kir5.1 and PSD-95 exhibit a Ba(2+)-sensitive inward-rectifying K+ current. Kir5.1 coexpressed with PSD-95 located on the plasma membrane in a clustered manner, while the Kir5.1 subunit expressed alone distributed mostly in cytoplasm, probably due to rapid internalization. The binding of Kir5.1 with PSD-95 was prevented by protein kinase A (PKA)-mediated phosphorylation of its carboxyl terminus. The currents flowing through Kir5.1/PSD-95 were suppressed promptly and reversibly by PKA activation. Because the Kir5.1/PSD-95 complex was detected in the brain, this functional brain K+ channel is potentially a novel physiological target of PKA-mediated signaling.
journal_name
Neuronjournal_title
Neuronauthors
Tanemoto M,Fujita A,Higashi K,Kurachi Ydoi
10.1016/s0896-6273(02)00675-xsubject
Has Abstractpub_date
2002-04-25 00:00:00pages
387-97issue
3eissn
0896-6273issn
1097-4199pii
S089662730200675Xjournal_volume
34pub_type
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