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-Structure paper
タイトル | Structure of the full-length human Pannexin1 channel and insights into its role in pyroptosis. |
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ジャーナル・号・ページ | Cell Discov, Vol. 7, Issue 1, Page 30, Year 2021 |
掲載日 | 2021年5月4日 |
著者 | Sensen Zhang / Baolei Yuan / Jordy Homing Lam / Jun Zhou / Xuan Zhou / Gerardo Ramos-Mandujano / Xueyuan Tian / Yang Liu / Renmin Han / Yu Li / Xin Gao / Mo Li / Maojun Yang / |
PubMed 要旨 | Pannexin1 (PANX1) is a large-pore ATP efflux channel with a broad distribution, which allows the exchange of molecules and ions smaller than 1 kDa between the cytoplasm and extracellular space. In ...Pannexin1 (PANX1) is a large-pore ATP efflux channel with a broad distribution, which allows the exchange of molecules and ions smaller than 1 kDa between the cytoplasm and extracellular space. In this study, we show that in human macrophages PANX1 expression is upregulated by diverse stimuli that promote pyroptosis, which is reminiscent of the previously reported lipopolysaccharide-induced upregulation of PANX1 during inflammasome activation. To further elucidate the function of PANX1, we propose the full-length human Pannexin1 (hPANX1) model through cryo-electron microscopy (cryo-EM) and molecular dynamics (MD) simulation studies, establishing hPANX1 as a homo-heptamer and revealing that both the N-termini and C-termini protrude deeply into the channel pore funnel. MD simulations also elucidate key energetic features governing the channel that lay a foundation to understand the channel gating mechanism. Structural analyses, functional characterizations, and computational studies support the current hPANX1-MD model, suggesting the potential role of hPANX1 in pyroptosis during immune responses. |
リンク | Cell Discov / PubMed:33947837 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.15 Å |
構造データ | EMDB-30880, PDB-7dwb: EMDB-30881: EMDB-31025: |
由来 |
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キーワード | MEMBRANE PROTEIN / plasma membrane / ion channel |