Discovery of an Allosteric Binding Site in Kinetoplastid Methionyl-tRNA Synthetase.
ACS Infect Dis
; 6(5): 1044-1057, 2020 05 08.
Article
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| MEDLINE
| ID: mdl-32275825
ABSTRACT
Methionyl-tRNA synthetase (MetRS) is a chemically validated drug target in kinetoplastid parasites Trypanosoma brucei and Leishmania donovani. To date, all kinetoplastid MetRS inhibitors described bind in a similar way to an expanded methionine pocket and an adjacent, auxiliary pocket. In the current study, we have identified a structurally novel class of inhibitors containing a 4,6-diamino-substituted pyrazolopyrimidine core (the MetRS02 series). Crystallographic studies revealed that MetRS02 compounds bind to an allosteric pocket in L. major MetRS not previously described, and enzymatic studies demonstrated a noncompetitive mode of inhibition. Homology modeling of the Trypanosoma cruzi MetRS enzyme revealed key differences in the allosteric pocket between the T. cruzi and Leishmania enzymes. These provide a likely explanation for the lower MetRS02 potencies that we observed for the T. cruzi enzyme compared to the Leishmania enzyme. The identification of a new series of MetRS inhibitors and the discovery of a new binding site in kinetoplastid MetRS enzymes provide a novel strategy in the search for new therapeutics for kinetoplastid diseases.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Trypanosoma brucei brucei
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Proteínas Protozoarias
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Sitio Alostérico
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Metionina-ARNt Ligasa
Idioma:
En
Revista:
ACS Infect Dis
Año:
2020
Tipo del documento:
Article
País de afiliación:
Reino Unido