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TitleActivation mechanism and structural assembly of the Mycobacterium tuberculosis ClpP1P2 protease and its associated ATPases.
Journal, issue, pagesCell Rep, Vol. 45, Issue 6, Page 117400, Year 2026
Publish dateJun 23, 2026
AuthorsKatharina Weinhäupl / Tatos Akopian / Dmitry A Semchonok / Olga Krandor / Rocío Arranz / M Teresa Bueno-Carrasco / Marcos Gragera / Maelenn Chevreuil / Bertrand Raynal / Samuel Zinga / Yuxin Liu / Jack Lai / WenGen Wu / William Bachovchin / Diego Gauto / Alfred Goldberg / Eric Rubin / Hugo Fraga /
PubMed AbstractSupramolecular assemblies are fundamental to cellular biochemical processes, relying on their dynamic nature to perform essential functions. The protease ClpP1P2, in association with ATPase partners ...Supramolecular assemblies are fundamental to cellular biochemical processes, relying on their dynamic nature to perform essential functions. The protease ClpP1P2, in association with ATPase partners ClpC1 or ClpX, is critical for the survival of Mycobacterium tuberculosis (Mtb). While the ClpP1P2 complex requires activation by specific N-blocked dipeptides to exhibit proteolytic activity in vitro, the mechanism of in vivo activation remains unclear. In this study, we use cryo-electron microscopy (cryo-EM) to determine the structure of the ClpC1P1P2 complex, revealing a highly asymmetric architecture with ClpC1 bound to the ClpP1P2 protease barrel. The activator dipeptide is observed only in the ClpP2 active site, while the ClpP1 entry pore remains closed. Molecular crowding agents promote the formation of larger ClpXP1P2 and ClpC1P1P2 complexes, enhancing structural stability and enzymatic activity. These findings suggest that molecular crowding stabilizes these complexes and promotes their activation, providing new insights into ClpC1P1P2 structural dynamics and function.
External linksCell Rep / PubMed:42213777
MethodsEM (single particle)
Resolution3.05 - 3.37 Å
Structure data

EMDB-52764: Structure of the Mycobacterium tuberculosis ClpC1P1P2 complex bound to the activator Bz-LL - focused refinement ClpC1
Method: EM (single particle) / Resolution: 3.13 Å

EMDB-52765: Structure of the Mycobacterium tuberculosis ClpC1P1P2 complex bound to the activator Bz-LL - consensus map
Method: EM (single particle) / Resolution: 3.37 Å

EMDB-52766: Structure of the Mycobacterium tuberculosis ClpC1P1P2 complex bound to the activator Bz-LL - focused map ClpP1P2
Method: EM (single particle) / Resolution: 3.05 Å

52840

9if4

EMDB-52840, PDB-9if4:
Structure of the Mycobacterium Tuberculosis ClpC1P1P2 complex bound to the activator Bz-Leu-Leu
Method: EM (single particle) / Resolution: 3.09 Å

Chemicals

ChemComp-ADP:
ADENOSINE-5'-DIPHOSPHATE / ADP, energy-carrying molecule*YM

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM

Source
  • mycobacterium tuberculosis (bacteria)
  • synthetic construct (others)
KeywordsCHAPERONE / protein quality control / peptide activator / protease / ATPase

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