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-Structure paper
タイトル | Regulation of Eag1 gating by its intracellular domains. |
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ジャーナル・号・ページ | Elife, Vol. 8, Year 2019 |
掲載日 | 2019年9月6日 |
著者 | Jonathan R Whicher / Roderick MacKinnon / |
PubMed 要旨 | Voltage-gated potassium channels (Ks) are gated by transmembrane voltage sensors (VS) that move in response to changes in membrane voltage. K10.1 or Eag1 also has three intracellular domains: PAS, C- ...Voltage-gated potassium channels (Ks) are gated by transmembrane voltage sensors (VS) that move in response to changes in membrane voltage. K10.1 or Eag1 also has three intracellular domains: PAS, C-linker, and CNBHD. We demonstrate that the Eag1 intracellular domains are not required for voltage-dependent gating but likely interact with the VS to modulate gating. We identified specific interactions between the PAS, CNBHD, and VS that modulate voltage-dependent gating and provide evidence that VS movement destabilizes these interactions to promote channel opening. Additionally, mutation of these interactions renders Eag1 insensitive to calmodulin inhibition. The structure of the calmodulin insensitive mutant in a pre-open conformation suggests that channel opening may occur through a rotation of the intracellular domains and calmodulin may prevent this rotation by stabilizing interactions between the VS and intracellular domains. Intracellular domains likely play a similar modulatory role in voltage-dependent gating of the related K11-12 channels. |
リンク | Elife / PubMed:31490124 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.67 - 4.0 Å |
構造データ | EMDB-20294, PDB-6pbx: EMDB-20295, PDB-6pby: |
由来 |
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キーワード | TRANSPORT PROTEIN/CALCIUM BINDING PROTEIN / Voltage-gated potassium channel / ion channel / calmodulin / TRANSPORT PROTEIN-CALCIUM BINDING PROTEIN complex |