Cloning, purification and characterization of Geobacillus stearothermophilus V uroporphyrinogen-III C-methyltransferase: evaluation of its role in resistance to potassium tellurite in Escherichia coli

Manuel A. Araya, Juan C. Tantaleán, José M. Pérez, Derie E. Fuentes, Iván L. Calderón, Claudia P. Saavedra, Radhika Burra, Thomas G. Chasteen, Claudio C. Vásquez

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

7 Citas (Scopus)

Resumen

The Geobacillus stearothermophilus V cobA gene encoding uroporphyrinogen-III C-methyltransferase (also referred to as SUMT) was cloned into Escherichia coli and the recombinant enzyme was overexpressed and purified to homogeneity. The enzyme binds S-adenosyl-l-methionine and catalyzes the production of III methyl uroporphyrinogen in vitro. E. coli cells expressing the G. stearothermophilus V cobA gene exhibited increased resistance to potassium tellurite and potassium tellurate. Site-directed mutagenesis of cobA abolished tellurite resistance of the mesophilic, heterologous host and SUMT activity in vitro. No methylated, volatile derivatives of tellurium were found in the headspace of tellurite-exposed cobA-expressing E. coli, suggesting that the role of SUMT methyltransferase in tellurite(ate) detoxification is not related to tellurium volatilization.

Idioma originalInglés
Páginas (desde-hasta)125-133
Número de páginas9
PublicaciónResearch in Microbiology
Volumen160
N.º2
DOI
EstadoPublicada - mar. 2009

Nota bibliográfica

Funding Information:
This work received financial support from Fondecyt grant # 1060022 and Dicyt-USACH to C.C.V. and from the Robert A. Welch Foundation (X-011) at Sam Houston State University to T.G.C. and R.B.

Funding Information:
M.A.A. and D.E.F. were supported by doctoral fellowships from Mecesup, Chile. I.L.C. received a doctoral fellowship from Conicyt, Chile and J.M.P. was supported by Mecesup, Conicyt and Dicyt-USACH, Chile.

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