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http://dx.doi.org/10.4196/kjpp.2020.24.6.555

Dual regulatory effects of PI(4,5)P2 on TREK-2 K+ channel through antagonizing interaction between the alkaline residues (K330 and R355-357) in the cytosolic C-terminal helix  

Kim, Sung Eun (Department of Physiology, Seoul National University College of Medicine)
Kim, Myoung-Hwan (Department of Physiology, Seoul National University College of Medicine)
Woo, Joohan (Department of Physiology, Dongguk University College of Medicine)
Kim, Sung Joon (Department of Physiology, Seoul National University College of Medicine)
Publication Information
The Korean Journal of Physiology and Pharmacology / v.24, no.6, 2020 , pp. 555-561 More about this Journal
Abstract
TWIK-related two-pore domain K+ channel-2 (TREK-2) has voltage-independent activity and shows additional activation by acidic intracellular pH (pHi) via neutralizing the E332 in the cytoplasmic C terminal (Ct). We reported opposite regulations of TREK-2 by phosphatidylinositol 4,5-bisphosphate (PIP2) via the alkaline K330 and triple Arg residues (R355-357); inhibition and activation, respectively. The G334 between them appeared critical because its mutation (G334A) endowed hTREK-2 with tonic activity, similar to the mutation of the inhibitory K330 (K330A). To further elucidate the role of putative bent conformation at G334, we compared the dual mutation forms, K330A/G334A and G334A/R355-7A, showing higher and lower basal activity, respectively. The results suggested that the tonic activity of G334A owes to a dominant influence from R355-7. Since there are additional triple Arg residues (R377-9) distal to R355-7, we also examined the triple mutant (G334A/R355-7A/R377-9A) that showed tonic inhibition same with G334A/R355-7A. Despite the state of tonic inhibition, the activation by acidic pHi was preserved in both G334A/R355-7A and G334A/R355-7A/R377-9A, similar to the R355-7A. Also, the inhibitory effect of ATP could be commonly demonstrated under the activation by acidic pHi in R355-7A, G334A/R355-7A, and G334A/R355-7A/R377-9A. These results suggest that the putative bent conformation at G334 is important to set the tug-of-war between K330 and R355-7 in the PIP2-dependent regulation of TREK-2.
Keywords
Amino acids, basic; C-terminal; $PIP_2$; Tandem pore domain potassium channels; TREK-2;
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