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-Structure paper
タイトル | Atomic structures of anthrax toxin protective antigen channels bound to partially unfolded lethal and edema factors. |
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ジャーナル・号・ページ | Nat Commun, Vol. 11, Issue 1, Page 840, Year 2020 |
掲載日 | 2020年2月11日 |
著者 | Nathan J Hardenbrook / Shiheng Liu / Kang Zhou / Koyel Ghosal / Z Hong Zhou / Bryan A Krantz / |
PubMed 要旨 | Following assembly, the anthrax protective antigen (PA) forms an oligomeric translocon that unfolds and translocates either its lethal factor (LF) or edema factor (EF) into the host cell. Here, we ...Following assembly, the anthrax protective antigen (PA) forms an oligomeric translocon that unfolds and translocates either its lethal factor (LF) or edema factor (EF) into the host cell. Here, we report the cryo-EM structures of heptameric PA channels with partially unfolded LF and EF at 4.6 and 3.1-Å resolution, respectively. The first α helix and β strand of LF and EF unfold and dock into a deep amphipathic cleft, called the α clamp, which resides at the interface of two PA monomers. The α-clamp-helix interactions exhibit structural plasticity when comparing the structures of lethal and edema toxins. EF undergoes a largescale conformational rearrangement when forming the complex with the channel. A critical loop in the PA binding interface is displaced for about 4 Å, leading to the weakening of the binding interface prior to translocation. These structures provide key insights into the molecular mechanisms of translocation-coupled protein unfolding and translocation. |
リンク | Nat Commun / PubMed:32047164 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.2 - 4.6 Å |
構造データ | EMDB-20459, PDB-6psn: EMDB-20955, PDB-6uzb: EMDB-20957, PDB-6uzd: EMDB-20958, PDB-6uze: |
化合物 | ChemComp-CA: |
由来 |
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キーワード | TRANSLOCASE / anthrax toxin / protective antigen / lethal factor / edema factor |