Escherichia coli 6-phosphogluconate dehydrogenase aids in tellurite resistance by reducing the toxicant in a NADPH-dependent manner
dc.creator | Universidad San Sebastián | |
dc.creator | Universidad San Sebastián | |
dc.creator | Universidad San Sebastián | |
dc.creator | Universidad San Sebastián | |
dc.creator | Universidad San Sebastián | |
dc.creator | Sandoval, J. M. | |
dc.creator | Arenas, F. A. | |
dc.creator | García, J. A. | |
dc.creator | Díaz-Vásquez, W. A. | |
dc.creator | Valdivia-González, M. | |
dc.creator | Sabotier, M. | |
dc.creator | Vásquez, C. C. | |
dc.date.accessioned | 2023-05-24T04:56:55Z | |
dc.date.available | 2023-05-24T04:56:55Z | |
dc.date.created | 2023-05-24T04:56:55Z | |
dc.date.issued | 2015-08-01 | |
dc.identifier | 0944-5013 | |
dc.identifier | https://repositorio.uss.cl/handle/uss/6863 | |
dc.identifier | 10.1016/j.micres.2015.05.002 | |
dc.description.abstract | 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. | |
dc.language | eng | |
dc.relation | Microbiological Research | |
dc.title | Escherichia coli 6-phosphogluconate dehydrogenase aids in tellurite resistance by reducing the toxicant in a NADPH-dependent manner | |
dc.type | Artículo |