Cryo-EM structure of the gasdermin A3 membrane pore.
Cryo-EM structure of the gasdermin A3 membrane pore.
复制标题
Gasdermin A3膜孔的冷冻EM结构。
DOI:
10.1038/s41586-018-0058-6
复制
发表时间:
2018-05
期刊:
影响因子:
64.8
通讯作者:
Wu H
中科院分区:
文献类型:
--
作者:
Ruan J;Xia S;Liu X;Lieberman J;Wu H
Gasdermins mediate inflammatory cell death after cleavage by caspases or other, unknown enzymes. The cleaved N-terminal fragments bind to acidic membrane lipids to form pores, but the mechanism of pore formation remains unresolved. Here we present the cryo-electron microscopy structures of the 27-fold and 28-fold single-ring pores formed by the N-terminal fragment of mouse GSDMA3 (GSDMA3-NT) at 3.8 and 4.2 Å resolutions, and of a double-ring pore at 4.6 Å resolution. In the 27-fold pore, a 108-stranded anti-parallel β-barrel is formed by two β-hairpins from each subunit capped by a globular domain. We identify a positively charged helix that interacts with the acidic lipid cardiolipin. GSDMA3-NT undergoes radical conformational changes upon membrane insertion to form long, membrane-spanning β-strands. We also observe an unexpected additional symmetric ring of GSDMA3-NT subunits that does not insert into the membrane in the double-ring pore, which may represent a pre-pore state of GSDMA3-NT. These structures provide a basis that explains the activities of several mutant gasdermins, including defective mutants that are associated with cancer.
登录
查看更多内容
影响因子:
48
作者:
Kucukelbir, Alp;Sigworth, Fred J.;Tagare, Hemant D.
通讯作者:
Tagare, Hemant D.
影响因子:
32.4
作者:
Evavold CL;Ruan J;Tan Y;Xia S;Wu H;Kagan JC
通讯作者:
Kagan JC
DOI:
10.1083/jcb.200708010
发表时间:
2008-03-10
期刊:
The Journal of cell biology
影响因子:
--
作者:
Idone V;Tam C;Goss JW;Toomre D;Pypaert M;Andrews NW
通讯作者:
Andrews NW
影响因子:
64.8
作者:
Shi, Jianjin;Zhao, Yue;Shao, Feng
通讯作者:
Shao, Feng
DOI:
10.1073/pnas.1607769113
发表时间:
2016-07-12
影响因子:
11.1
作者:
Aglietti, Robin A.;Estevez, Alberto;Dueber, Erin C.
通讯作者:
Dueber, Erin C.