Cryo-EM structures and dynamics of substrate-engaged human 26S proteasome

Yuanchen Dong, Shuwen Zhang, Zhaolong Wu, Xuemei Li, Wei Li Wang, Yanan Zhu, Svetla Stoilova-McPhie, Ying Lu, Daniel Finley and Youdong Mao ()
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Yuanchen Dong: Peking University
Shuwen Zhang: Peking University
Zhaolong Wu: Peking University
Xuemei Li: School of Physics, Peking University
Wei Li Wang: Peking University
Yanan Zhu: Peking University
Svetla Stoilova-McPhie: Harvard University
Ying Lu: Harvard Medical School
Daniel Finley: Harvard Medical School
Youdong Mao: Peking University

Nature, 2019, vol. 565, issue 7737, 49-55

Abstract: Abstract The proteasome is an ATP-dependent, 2.5-megadalton molecular machine that is responsible for selective protein degradation in eukaryotic cells. Here we present cryo-electron microscopy structures of the substrate-engaged human proteasome in seven conformational states at 2.8–3.6 Å resolution, captured during breakdown of a polyubiquitylated protein. These structures illuminate a spatiotemporal continuum of dynamic substrate–proteasome interactions from ubiquitin recognition to substrate translocation, during which ATP hydrolysis sequentially navigates through all six ATPases. There are three principal modes of coordinated hydrolysis, featuring hydrolytic events in two oppositely positioned ATPases, in two adjacent ATPases and in one ATPase at a time. These hydrolytic modes regulate deubiquitylation, initiation of translocation and processive unfolding of substrates, respectively. Hydrolysis of ATP powers a hinge-like motion in each ATPase that regulates its substrate interaction. Synchronization of ATP binding, ADP release and ATP hydrolysis in three adjacent ATPases drives rigid-body rotations of substrate-bound ATPases that are propagated unidirectionally in the ATPase ring and unfold the substrate.

Date: 2019
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DOI: 10.1038/s41586-018-0736-4

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