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-Structure paper
タイトル | Rearrangement of a unique Kv1.3 selectivity filter conformation upon binding of a drug. |
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ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 119, Issue 5, Year 2022 |
掲載日 | 2022年2月1日 |
著者 | Anu Tyagi / Tofayel Ahmed / Shi Jian / Saumya Bajaj / Seow Theng Ong / Stephanie Shee Min Goay / Yue Zhao / Igor Vorobyov / Changlin Tian / K George Chandy / Shashi Bhushan / |
PubMed 要旨 | We report two structures of the human voltage-gated potassium channel (Kv) Kv1.3 in immune cells alone (apo-Kv1.3) and bound to an immunomodulatory drug called dalazatide (dalazatide-Kv1.3). Both the ...We report two structures of the human voltage-gated potassium channel (Kv) Kv1.3 in immune cells alone (apo-Kv1.3) and bound to an immunomodulatory drug called dalazatide (dalazatide-Kv1.3). Both the apo-Kv1.3 and dalazatide-Kv1.3 structures are in an activated state based on their depolarized voltage sensor and open inner gate. In apo-Kv1.3, the aromatic residue in the signature sequence (Y447) adopts a position that diverges 11 Å from other K channels. The outer pore is significantly rearranged, causing widening of the selectivity filter and perturbation of ion binding within the filter. This conformation is stabilized by a network of intrasubunit hydrogen bonds. In dalazatide-Kv1.3, binding of dalazatide to the channel's outer vestibule narrows the selectivity filter, Y447 occupies a position seen in other K channels, and this conformation is stabilized by a network of intersubunit hydrogen bonds. These remarkable rearrangements in the selectivity filter underlie Kv1.3's transition into the drug-blocked state. |
リンク | Proc Natl Acad Sci U S A / PubMed:35091471 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.7 - 3.9 Å |
構造データ | EMDB-32459, PDB-7wf3: EMDB-32460, PDB-7wf4: EMDB-32486: EMDB-32487: EMDB-32488: EMDB-32489: EMDB-32494: EMDB-32495: |
化合物 | ChemComp-K: ChemComp-NAP: ChemComp-HOH: |
由来 |
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キーワード | MEMBRANE PROTEIN / Ion channel / Kv channel / Potassium channel / Peptide toxin / ShK / Dalazatide / Selectivity filter / Molecular dynamics simulation |