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Four G protein gated inwardly-rectifying potassium (GIRK) channel subunits have been identified in mammals: GIRK1, GIRK2, GIRK3, and GIRK4. The GIRK subunits come together to form GIRK ion channels.

G-protein-gated inwardly rectifying K + (GIRK) channels play a key role in maintaining resting membrane potential, cell excitability and inhibitory neurotransmission.

In this chapter, we describe advances in our understanding of GIRK channel function based on recent high-resolution atomic structures of inwardly rectifying K (+) channels discussed in the context of classical structure-function experiments.

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