Ras-association domain of sorting Nexin 27 is critical for regulating expression of GIRK potassium channels.
Ras-association domain of sorting Nexin 27 is critical for regulating expression of GIRK potassium channels.
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DOI:
10.1371/journal.pone.0059800
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Slesinger PA
中科院分区:
文献类型:
--
作者:
Balana B;Bahima L;Bodhinathan K;Taura JJ;Taylor NM;Nettleton MY;Ciruela F;Slesinger PA
G protein-gated inwardly rectifying potassium (GIRK) channels play an important role in regulating neuronal excitability. Sorting nexin 27b (SNX27b), which reduces surface expression of GIRK channels through a PDZ domain interaction, contains a putative Ras-association (RA) domain with unknown function. Deleting the RA domain in SNX27b (SNX27b-ΔRA) prevents the down-regulation of GIRK2c/GIRK3 channels. Similarly, a point mutation (K305A) in the RA domain disrupts regulation of GIRK2c/GIRK3 channels and reduces H-Ras binding in vitro. Finally, the dominant-negative H-Ras (S17N) occludes the SNX27b-dependent decrease in surface expression of GIRK2c/GIRK3 channels. Thus, the presence of a functional RA domain and the interaction with Ras-like G proteins comprise a novel mechanism for modulating SNX27b control of GIRK channel surface expression and cellular excitability.
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