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Artículo

The LonB protease controls membrane lipids composition and is essential for viability in the extremophilic haloarchaeon Haloferax volcanii

Cerletti, MicaelaIcon ; Martinez, Maria JuliaIcon ; Gimenez, Maria InesIcon ; Sastre, Diego EmilianoIcon ; Paggi, Roberto A.; de Castro, Rosana EstherIcon
Fecha de publicación: 06/2014
Editorial: Wiley
Revista: Environmental Microbiology
ISSN: 1462-2912
e-ISSN: 1462-2920
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Biología Celular, Microbiología

Resumen

Although homologs of the ATP-dependent Lon protease exist in all domains of life, the relevance of this protease in archaeal physiology remains a mystery. In this study, we have constructed and phenotypically characterized deletion and conditional lon mutants in the model haloarchaeon Haloferax volcanii to elucidate the role of the unusual membrane-bound LonB protease in archaea. Hvlon could be deleted from the chromosome only when a copy of the wild type gene was provided in trans suggesting that Lon is essential for survival in this archaeon. Successful complementation of the lethal phenotype of ΔHvlon was attained by expression of the heterologous protease gene Nmlon from the haloalkaliphilic archaeon Natrialba magadii, meaning that the biological function of Lon is conserved in these organisms. Suboptimal cellular levels of Lon protein affected growth rate, cell shape, cell pigmentation, lipid composition and sensitivity to various antibiotics. The contents of bacterioruberins and some polar lipids were increased in the lon mutants suggesting that Lon is linked to maintenance of membrane lipid balance which likely affects cell viability in this archaeon. The phenotypes associated to a membrane-bound LonB protease mutant were examined for the first time providing insight on the relevance of this protease in archaeal physiology.
Palabras clave: Lonb Protease , Haloferax Volcanii , Haloarchaea
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/13121
URL: http://onlinelibrary.wiley.com/doi/10.1111/1462-2920.12385/abstract
URL: http://dx.doi.org/10.1111/1462-2920.12385
Colecciones
Articulos(IIB)
Articulos de INSTITUTO DE INVESTIGACIONES BIOLOGICAS
Citación
Cerletti, Micaela; Martinez, Maria Julia; Gimenez, Maria Ines; Sastre, Diego Emiliano; Paggi, Roberto A.; et al.; The LonB protease controls membrane lipids composition and is essential for viability in the extremophilic haloarchaeon Haloferax volcanii; Wiley; Environmental Microbiology; 16; 6; 6-2014; 1779-1792
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