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Substrate-engaged 26S proteasome structures reveal mechanisms for ATP-hydrolysis-driven translocation.

de la Peña AH, Goodall EA, Gates SN, Lander GC, Martin A
Science 362 (2018)
Related entries: 6ef0, 6ef1, 6ef2

Cited: 145 times
EuropePMC logo PMID: 30309908

Abstract

The 26S proteasome is the primary eukaryotic degradation machine and thus is critically involved in numerous cellular processes. The heterohexameric adenosine triphosphatase (ATPase) motor of the proteasome unfolds and translocates targeted protein substrates into the open gate of a proteolytic core while a proteasomal deubiquitinase concomitantly removes substrate-attached ubiquitin chains. However, the mechanisms by which ATP hydrolysis drives the conformational changes responsible for these processes have remained elusive. Here we present the cryo-electron microscopy structures of four distinct conformational states of the actively ATP-hydrolyzing, substrate-engaged 26S proteasome. These structures reveal how mechanical substrate translocation accelerates deubiquitination and how ATP-binding, -hydrolysis, and phosphate-release events are coordinated within the AAA+ (ATPases associated with diverse cellular activities) motor to induce conformational changes and propel the substrate through the central pore.

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Articles - 6ef3 mentioned but not cited (8)

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