7ABR image
Entry Detail
PDB ID:
7ABR
EMDB ID:
Keywords:
Title:
Cryo-EM structure of B. subtilis ClpC (DWB mutant) hexamer bound to a substrate polypeptide
Biological Source:
PDB Version:
Deposition Date:
2020-09-08
Release Date:
2021-10-06
Method Details:
Experimental Method:
Resolution:
3.70 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Negative regulator of genetic competence ClpC/MecB
Mutations:E280A, E618A
Chain IDs:A, B, C, D, E, F
Chain Length:818
Number of Molecules:6
Biological Source:Bacillus subtilis (strain 168)
Polymer Type:polypeptide(L)
Description:substrate polypeptide
Chain IDs:G (auth: S)
Chain Length:26
Number of Molecules:1
Biological Source:unidentified
Primary Citation

Abstact

Hijacking the cellular protein degradation system offers unique opportunities for drug discovery, as exemplified by proteolysis-targeting chimeras. Despite their great promise for medical chemistry, so far, it has not been possible to reprogram the bacterial degradation machinery to interfere with microbial infections. Here, we develop small-molecule degraders, so-called BacPROTACs, that bind to the substrate receptor of the ClpC:ClpP protease, priming neo-substrates for degradation. In addition to their targeting function, BacPROTACs activate ClpC, transforming the resting unfoldase into its functional state. The induced higher-order oligomer was visualized by cryo-EM analysis, providing a structural snapshot of activated ClpC unfolding a protein substrate. Finally, drug susceptibility and degradation assays performed in mycobacteria demonstrate in vivo activity of BacPROTACs, allowing selective targeting of endogenous proteins via fusion to an established degron. In addition to guiding antibiotic discovery, the BacPROTAC technology presents a versatile research tool enabling the inducible degradation of bacterial proteins.

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Primary Citation of related structures