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Structure paper

TitleStructure of mycobacterial CIIICIV respiratory supercomplex bound to the tuberculosis drug candidate telacebec (Q203).
Journal, issue, pagesElife, Vol. 10, Year 2021
Publish dateSep 30, 2021
AuthorsDavid J Yanofsky / Justin M Di Trani / Sylwia Król / Rana Abdelaziz / Stephanie A Bueler / Peter Imming / Peter Brzezinski / John L Rubinstein /
PubMed AbstractThe imidazopyridine telacebec, also known as Q203, is one of only a few new classes of compounds in more than 50 years with demonstrated antituberculosis activity in humans. Telacebec inhibits the ...The imidazopyridine telacebec, also known as Q203, is one of only a few new classes of compounds in more than 50 years with demonstrated antituberculosis activity in humans. Telacebec inhibits the mycobacterial respiratory supercomplex composed of complexes III and IV (CIIICIV). In mycobacterial electron transport chains, CIIICIV replaces canonical CIII and CIV, transferring electrons from the intermediate carrier menaquinol to the final acceptor, molecular oxygen, while simultaneously transferring protons across the inner membrane to power ATP synthesis. We show that telacebec inhibits the menaquinol:oxygen oxidoreductase activity of purified CIIICIV at concentrations similar to those needed to inhibit electron transfer in mycobacterial membranes and growth in culture. We then used electron cryomicroscopy (cryoEM) to determine structures of CIIICIV both in the presence and absence of telacebec. The structures suggest that telacebec prevents menaquinol oxidation by blocking two different menaquinol binding modes to prevent CIIICIV activity.
External linksElife / PubMed:34590581 / PubMed Central
MethodsEM (single particle)
Resolution3.0 - 3.5 Å
Structure data

24455

7rh5

EMDB-24455, PDB-7rh5:
Mycobacterial CIII2CIV2 supercomplex, Inhibitor free
Method: EM (single particle) / Resolution: 3.0 Å

24456

7rh6

EMDB-24456, PDB-7rh6:
Mycobacterial CIII2CIV2 supercomplex, inhibitor free, -Lpqe cyt cc open
Method: EM (single particle) / Resolution: 3.5 Å

24457

7rh7

EMDB-24457, PDB-7rh7:
Mycobacterial CIII2CIV2 supercomplex, Telacebec (Q203) bound
Method: EM (single particle) / Resolution: 3.0 Å

Chemicals

ChemComp-CU:
COPPER (II) ION / Copper

ChemComp-HEA:
HEME-A / Heme A

ChemComp-CDL:
CARDIOLIPIN / phospholipid*YM / Cardiolipin

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE / Heme B

ChemComp-MQ9:
MENAQUINONE-9 / Vitamin K2

ChemComp-9Y0:
(2R)-3-(((2-aminoethoxy)(hydroxy)phosphoryl)oxy)-2-(palmitoyloxy)propyl (E)-octadec-9-enoate

ChemComp-PLM:
PALMITIC ACID / Palmitic acid

ChemComp-9XX:
(2S)-1-(hexadecanoyloxy)propan-2-yl (10S)-10-methyloctadecanoate

ChemComp-HEC:
HEME C / Heme C

ChemComp-9YF:
(2R)-2-(hexadecanoyloxy)-3-{[(S)-hydroxy{[(1R,2R,3R,4R,5R,6S)-2,3,4,5,6-pentahydroxycyclohexyl]oxy}phosphoryl]oxy}propyl (9S)-9-methyloctadecanoate

ChemComp-FES:
FE2/S2 (INORGANIC) CLUSTER / Iron–sulfur cluster

ChemComp-HUU:
6-chloranyl-2-ethyl-N-[[4-[4-[4-(trifluoromethyloxy)phenyl]piperidin-1-yl]phenyl]methyl]imidazo[1,2-a]pyridine-3-carboxamide

Source
  • mycolicibacterium smegmatis (strain atcc 700084 / mc(2)155) (bacteria)
  • mycolicibacterium smegmatis mc2 155 (bacteria)
KeywordsMEMBRANE PROTEIN / Electron transport chain / CIII2CIV2 supercomplex

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