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-Structure paper
タイトル | Structure of the Inhibited State of the Sec Translocon. |
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ジャーナル・号・ページ | Mol Cell, Vol. 79, Issue 3, Page 406-415.e7, Year 2020 |
掲載日 | 2020年8月6日 |
著者 | Samuel F Gérard / Belinda S Hall / Afroditi M Zaki / Katherine A Corfield / Peter U Mayerhofer / Catia Costa / Daniel K Whelligan / Philip C Biggin / Rachel E Simmonds / Matthew K Higgins / |
PubMed 要旨 | Protein secretion in eukaryotes and prokaryotes involves a universally conserved protein translocation channel formed by the Sec61 complex. Unrelated small-molecule natural products and synthetic ...Protein secretion in eukaryotes and prokaryotes involves a universally conserved protein translocation channel formed by the Sec61 complex. Unrelated small-molecule natural products and synthetic compounds inhibit Sec61 with differential effects for different substrates or for Sec61 from different organisms, making this a promising target for therapeutic intervention. To understand the mode of inhibition and provide insight into the molecular mechanism of this dynamic translocon, we determined the structure of mammalian Sec61 inhibited by the Mycobacterium ulcerans exotoxin mycolactone via electron cryo-microscopy. Unexpectedly, the conformation of inhibited Sec61 is optimal for substrate engagement, with mycolactone wedging open the cytosolic side of the lateral gate. The inability of mycolactone-inhibited Sec61 to effectively transport substrate proteins implies that signal peptides and transmembrane domains pass through the site occupied by mycolactone. This provides a foundation for understanding the molecular mechanism of Sec61 inhibitors and reveals novel features of translocon function and dynamics. |
リンク | Mol Cell / PubMed:32692975 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.69 Å |
構造データ | EMDB-11064, PDB-6z3t: |
化合物 | ChemComp-Q6B: |
由来 |
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キーワード | MEMBRANE PROTEIN / Sec61; mycolactone; ribosome-translocon complex; translocation inhibitor |