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TitleCryo-Electron Microscopy Structure of the s Cytochrome : Supercomplex and a Novel Inhibitor Targeting Subunit Cytochrome I.
Journal, issue, pagesAntimicrob Agents Chemother, Vol. 67, Issue 6, Page e0153122, Year 2023
Publish dateJun 15, 2023
AuthorsVikneswaran Mathiyazakan / Chui-Fann Wong / Amaravadhi Harikishore / Kevin Pethe / Gerhard Grüber /
PubMed AbstractThe mycobacterial cytochrome complex deserves the name "supercomplex" since it combines three cytochrome oxidases-cytochrome , cytochrome , and cytochrome -into one supramolecular machine and ...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.
External linksAntimicrob Agents Chemother / PubMed:37158740 / PubMed Central
MethodsEM (tomography)
Structure data

34664

8hcr

EMDB-34664, PDB-8hcr:
Cryo-EM structure of the Mycobacterium tuberculosis cytochrome bcc:aa3 supercomplex and a novel inhibitor targeting subunit cytochrome cI
Method: EM (tomography)

Chemicals

ChemComp-FES:
FE2/S2 (INORGANIC) CLUSTER

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE

ChemComp-HEC:
HEME C

ChemComp-HEA:
HEME-A

Source
  • mycobacterium tuberculosis variant bovis bcg (bacteria)
KeywordsOXIDOREDUCTASE / Cytochrome bcc:aa3 oxidase / Mycobacterium tuberculosis

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