8HCR
Cryo-EM structure of the Mycobacterium tuberculosis cytochrome bcc:aa3 supercomplex and a novel inhibitor targeting subunit cytochrome cI
Summary for 8HCR
| Entry DOI | 10.2210/pdb8hcr/pdb |
| EMDB information | 34664 |
| Descriptor | Cytochrome bc1 complex Rieske iron-sulfur subunit, FE2/S2 (INORGANIC) CLUSTER, PROTOPORPHYRIN IX CONTAINING FE, ... (13 entities in total) |
| Functional Keywords | cytochrome bcc:aa3 oxidase, mycobacterium tuberculosis, oxidoreductase |
| Biological source | Mycobacterium tuberculosis variant bovis BCG More |
| Total number of polymer chains | 18 |
| Total formula weight | 620764.09 |
| Authors | Mathiyazakan, V.,Gruber, G. (deposition date: 2022-11-02, release date: 2023-05-03, Last modification date: 2023-09-13) |
| Primary citation | Mathiyazakan, V.,Wong, C.F.,Harikishore, A.,Pethe, K.,Gruber, G. Cryo-Electron Microscopy Structure of the Mycobacterium tuberculosi s Cytochrome bcc : aa 3 Supercomplex and a Novel Inhibitor Targeting Subunit Cytochrome c I. Antimicrob.Agents Chemother., 67:e0153122-e0153122, 2023 Cited by PubMed Abstract: The mycobacterial cytochrome complex deserves the name "supercomplex" since it combines three cytochrome oxidases-cytochrome , cytochrome , and cytochrome -into one supramolecular machine and performs electron transfer for the reduction of oxygen to water and proton transport to generate the proton motive force for ATP synthesis. Thus, the complex represents a valid drug target for Mycobacterium tuberculosis infections. The production and purification of an entire M. tuberculosis cytochrome are fundamental for biochemical and structural characterization of this supercomplex, paving the way for new inhibitor targets and molecules. Here, we produced and purified the entire and active M. tuberculosis cyt- oxidase, as demonstrated by the different heme spectra and an oxygen consumption assay. The resolved M. tuberculosis cyt- cryo-electron microscopy structure reveals a dimer with its functional domains involved in electron, proton, oxygen transfer, and oxygen reduction. The structure shows the two cytochrome III head domains of the dimer, the counterpart of the soluble mitochondrial cytochrome , in a so-called "closed state," in which electrons are translocated from the to the domain. The structural and mechanistic insights provided the basis for a virtual screening campaign that identified a potent M. tuberculosis cyt- inhibitor, cyt1. cyt1 targets the mycobacterium-specific α3-helix of cytochrome I and interferes with oxygen consumption by interrupting electron translocation via the III head. The successful identification of a new cyt- inhibitor demonstrates the potential of a structure-mechanism-based approach for novel compound development. PubMed: 37158740DOI: 10.1128/aac.01531-22 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY |
Structure validation
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