Complete subunit architecture of the proteasome regulatory particle.
Complete subunit architecture of the proteasome regulatory particle.
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DOI:
10.1038/nature10774
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发表时间:
2012-01-11
期刊:
影响因子:
64.8
通讯作者:
Martin, Andreas
中科院分区:
文献类型:
--
作者:
Lander, Gabriel C.;Estrin, Eric;Matyskiela, Mary E.;Bashore, Charlene;Nogales, Eva;Martin, Andreas
The proteasome is the major ATP-dependent protease in eukaryotic cells, but limited structural information strongly restricts a mechanistic understanding of its activities. The proteasome regulatory particle, consisting of the lid and base subcomplexes, recognizes and processes poly-ubiquitinated substrates. We used electron microscopy and a newly-developed heterologous expression system for the lid to delineate the complete subunit architecture of the regulatory particle. Our studies reveal the spatial arrangement of ubiquitin receptors, deubiquitinating enzymes, and the protein unfolding machinery at subnanometer resolution, outlining the substrate’s path to degradation. Unexpectedly, the ATPase subunits within the base unfoldase are arranged in a spiral staircase, providing insight into potential mechanisms for substrate translocation through the central pore. Large conformational rearrangements of the lid upon holoenzyme formation suggest allosteric regulation of deubiquitination. We provide a structural basis for the ability of the proteasome to degrade a diverse set of substrates and thus regulate vital cellular processes.
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影响因子:
16
作者:
Leggett, DS;Hanna, J;Finley, D
通讯作者:
Finley, D
影响因子:
3
作者:
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通讯作者:
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DOI:
10.1038/80992
发表时间:
2000-11-01
期刊:
NATURE STRUCTURAL BIOLOGY
影响因子:
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作者:
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通讯作者:
Finley, D
影响因子:
64.5
作者:
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通讯作者:
Lang MJ
影响因子:
16.6
作者:
Finley D
通讯作者:
Finley D