Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
Luchian, T; Schreibmayer, W.
Ion permeation through a G-protein activated (GIRK1/GIRK5) inwardly rectifying potassium channel.
BBA, BIOMEMBRANES. 1998; 1368(2): 167-170.
Doi: 10.1016/S0005-2736(97)00248-4
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- Führende Autor*innen der Med Uni Graz
- Schreibmayer Wolfgang
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- Abstract:
- In order to further investigate a G-protein activated inwardly rectifying potassium channel subunit, GIRK1 was expressed in Xenopus oocytes (where it coassembles with the endogenous GIRK5). The mechanism underlying ion permeation and rectification were measured in isolated inside-out patches. Single channel current amplitudes under symmetrical K+ concentrations at different holding potentials were evaluated. Inward-rectification of K+-currents through open GIRK1/GIRK5 channels was removed by washing out polyamines and Mg2+ ions. We developed a simple 'two-sites-three-barrier' (2S3B) Eyring rate theory model of K+ ion permeation for GIRK1/GIRK5 channels. The resulting optimized parameter-set will be used as a working model for subsequent investigation regarding K+ permeation process through the GIRK1/GIRK5 channel.
- Find related publications in this database (using NLM MeSH Indexing)
- Animals -
- Cations, Divalent -
- G Protein-Coupled Inwardly-Rectifying Potassium Channels -
- Ion Channel Gating - physiology
- Ion Transport - physiology
- Magnesium - physiology
- Membrane Potentials - physiology
- Oocytes - physiology
- Patch-Clamp Techniques - physiology
- Polyamines - physiology
- Potassium - metabolism
- Potassium Channels - chemistry
- Potassium Channels, Inwardly Rectifying - chemistry
- Xenopus laevis - chemistry
- Find related publications in this database (Keywords)
- Girk
- Inward Rectifier
- Potassium Channel
- Eyring Rate Theory
- G-Protein
- Ion Permeation