Escherichia coli 6-phosphogluconate dehydrogenase aids in tellurite resistance by reducing the toxicant in a NADPH-dependent manner

J. M. Sandoval, F. A. Arenas, J. A. García, W. A. Díaz-Vásquez, M. Valdivia-González, M. Sabotier, C. C. Vásquez*

*Autor correspondiente de este trabajo

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

13 Citas (Scopus)

Resumen

Exposure to the tellurium oxyanion tellurite (TeO32-) results in the establishment of an oxidative stress status in most microorganisms. Usually, bacteria growing in the presence of the toxicant turn black because of the reduction of tellurite (Te4+) to the less-toxic elemental tellurium (Te0). In vitro, at least part of tellurite reduction occurs enzymatically in a nicotinamide dinucleotide-dependent reaction. In this work, we show that TeO32- reduction by crude extracts of Escherichia coli overexpressing the zwf gene (encoding glucose-6-phosphate dehydrogenase) takes place preferentially in the presence of NADPH instead of NADH. The enzyme responsible for toxicant reduction was identified as 6-phosphogluconate dehydrogenase (Gnd). The gnd gene showed a subtle induction at short times after toxicant exposure while strains lacking gnd were more susceptible to the toxicant. These results suggest that both NADPH-generating enzymes from the pentose phosphate shunt may be involved in tellurite detoxification and resistance in E. coli.

Idioma originalInglés
Páginas (desde-hasta)22-27
Número de páginas6
PublicaciónMicrobiological Research
Volumen177
DOI
EstadoPublicada - 2015

Nota bibliográfica

Publisher Copyright:
© 2015 Elsevier GmbH.

Áreas temáticas de ASJC Scopus

  • Microbiología

Huella

Profundice en los temas de investigación de 'Escherichia coli 6-phosphogluconate dehydrogenase aids in tellurite resistance by reducing the toxicant in a NADPH-dependent manner'. En conjunto forman una huella única.

Citar esto