Structural basis of prokaryotic ubiquitin-like protein engagement and translocation by the mycobacterial Mpa-proteasome complex

Mikhail Kavalchuk, Ahmad Jomaa (), Andreas U. Müller and Eilika Weber-Ban ()
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Mikhail Kavalchuk: ETH Zurich, Institute of Molecular Biology & Biophysics
Ahmad Jomaa: ETH Zurich, Institute of Molecular Biology & Biophysics
Andreas U. Müller: ETH Zurich, Institute of Molecular Biology & Biophysics
Eilika Weber-Ban: ETH Zurich, Institute of Molecular Biology & Biophysics

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract Proteasomes are present in eukaryotes, archaea and Actinobacteria, including the human pathogen Mycobacterium tuberculosis, where proteasomal degradation supports persistence inside the host. In mycobacteria and other members of Actinobacteria, prokaryotic ubiquitin-like protein (Pup) serves as a degradation tag post-translationally conjugated to target proteins for their recruitment to the mycobacterial proteasome ATPase (Mpa). Here, we use single-particle cryo-electron microscopy to determine the structure of Mpa in complex with the 20S core particle at an early stage of pupylated substrate recruitment, shedding light on the mechanism of substrate translocation. Two conformational states of Mpa show how substrate is translocated stepwise towards the degradation chamber of the proteasome core particle. We also demonstrate, in vitro and in vivo, the importance of a structural feature in Mpa that allows formation of alternating charge-complementary interactions with the proteasome resulting in radial, rail-guided movements during the ATPase conformational cycle.

Date: 2022
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DOI: 10.1038/s41467-021-27787-3

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