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TitleMefloquine targets the Plasmodium falciparum 80S ribosome to inhibit protein synthesis.
Journal, issue, pagesNat Microbiol, Vol. 2, Page 17031, Year 2017
Publish dateMar 13, 2017
AuthorsWilson Wong / Xiao-Chen Bai / Brad E Sleebs / Tony Triglia / Alan Brown / Jennifer K Thompson / Katherine E Jackson / Eric Hanssen / Danushka S Marapana / Israel S Fernandez / Stuart A Ralph / Alan F Cowman / Sjors H W Scheres / Jake Baum /
PubMed AbstractMalaria control is heavily dependent on chemotherapeutic agents for disease prevention and drug treatment. Defining the mechanism of action for licensed drugs, for which no target is characterized, ...Malaria control is heavily dependent on chemotherapeutic agents for disease prevention and drug treatment. Defining the mechanism of action for licensed drugs, for which no target is characterized, is critical to the development of their second-generation derivatives to improve drug potency towards inhibition of their molecular targets. Mefloquine is a widely used antimalarial without a known mode of action. Here, we demonstrate that mefloquine is a protein synthesis inhibitor. We solved a 3.2 Å cryo-electron microscopy structure of the Plasmodium falciparum 80S ribosome with the (+)-mefloquine enantiomer bound to the ribosome GTPase-associated centre. Mutagenesis of mefloquine-binding residues generates parasites with increased resistance, confirming the parasite-killing mechanism. Furthermore, structure-guided derivatives with an altered piperidine group, predicted to improve binding, show enhanced parasiticidal effect. These data reveal one possible mode of action for mefloquine and demonstrate the vast potential of cryo-electron microscopy to guide the development of mefloquine derivatives to inhibit parasite protein synthesis.
External linksNat Microbiol / PubMed:28288098 / PubMed Central
MethodsEM (single particle)
Resolution3.2 Å
Structure data

8576

5umd

EMDB-8576, PDB-5umd:
Structure of the Plasmodium falciparum 80S ribosome bound to the antimalarial drug mefloquine
Method: EM (single particle) / Resolution: 3.2 Å

Chemicals

ChemComp-YMZ:
Mefloquine / medication*YM / Mefloquine

ChemComp-MG:
Unknown entry

ChemComp-ZN:
Unknown entry

Source
  • plasmodium falciparum 3d7 (eukaryote)
KeywordsRIBOSOME / protein synthesis / antimalarial

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