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Abstract:

Phasins (PhaP) are proteins normally associated with granules of poly(3-hydroxybutyrate) (PHB), a biodegradable polymer accumulated by many bacteria as a reserve molecule. These proteins enhance growth and polymer production in natural and recombinant PHB producers. It has been shown that the production of PHB causes stress in recombinant Escherichia coli, revealed by an increase in the concentrations of several heat stress proteins. In this work, quantitative reverse transcription (qRT)-PCR analysis was used to study the effect of PHB accumulation, and that of PhaP from Azotobacter sp. strain FA8, on the expression of stress-related genes in PHB-producing E. coli. While PHB accumulation was found to increase the transcription of dnaK and ibpA, the expression of these genes and of groES, groEL, rpoH, dps, and yfiD was reduced, when PhaP was coexpressed, to levels even lower than those detected in the non-PHB-accumulating control. These results demonstrated the protective role of PhaP in PHB-synthesizing E. coli and linked the effects of the protein to the expression of stress-related genes, especially ibpA. The effect of PhaP was also analyzed in non-PHBsynthesizing strains, showing that expression of this heterologous protein has an unexpected protective effect in E. coli, under both normal and stress conditions, resulting in increased growth and higher resistance to both heat shock and superoxide stress by paraquat. In addition, PhaP expression was shown to reduce RpoH protein levels during heat shock, probably by reducing or titrating the levels of misfolded proteins. © 2011, American Society for Microbiology.

Registro:

Documento: Artículo
Título:Unexpected stress-Reducing effect of PhaP, a poly(3-hydroxybutyrate) granule-associated protein, in Escherichia coli
Autor:Almeida, A.; Catone, M.V.; Rhodius, V.A.; Gross, C.A.; Pettinari, M.J.
Filiación:Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Department of Microbiology and Immunology, University of California at San Francisco, San Francisco, CA 94158, United States
Department of Cell and Tissue Biology, University of California at San Francisco, San Francisco, CA 94158, United States
Palabras clave:Coexpressed; E. coli; Granule-associated proteins; Heat stress; Heat-shock; Heterologous proteins; Misfolded proteins; PCR analysis; PHB accumulation; Poly(3-hydroxybutyrate); Polymer production; Protective effects; Protein level; Recombinant Escherichia coli; Reverse transcription; Stress condition; Stress-related gene; Superoxides; Biodegradable polymers; Escherichia coli; Genes; Granulation; Heat resistance; Oxygen; Proteins; Strain; Transcription; Biosynthesis; bacterial protein; chaperone; DNA binding protein; Escherichia coli protein; hydroxybutyric acid; PHAP protein, Bacteria; poly(3 hydroxybutyric acid); poly-beta-hydroxybutyrate; polyester; recombinant protein; biodegradation; coliform bacterium; experimental study; polymer; polymerase chain reaction; protein; real time; recombination; temperature tolerance; article; Azotobacter; biosynthesis; enzymology; Escherichia coli; gene expression profiling; genetics; metabolism; physiological stress; physiology; Azotobacter; Bacterial Proteins; DNA-Binding Proteins; Escherichia coli; Escherichia coli Proteins; Gene Expression Profiling; Hydroxybutyrates; Molecular Chaperones; Polyesters; Recombinant Proteins; Stress, Physiological; Azotobacter; Escherichia coli
Año:2011
Volumen:77
Número:18
Página de inicio:6622
Página de fin:6629
DOI: http://dx.doi.org/10.1128/AEM.05469-11
Título revista:Applied and Environmental Microbiology
Título revista abreviado:Appl. Environ. Microbiol.
ISSN:00992240
CODEN:AEMID
CAS:hydroxybutyric acid, 1320-61-2, 35054-79-6; poly(3 hydroxybutyric acid), 26063-00-3; Bacterial Proteins; DNA-Binding Proteins; Escherichia coli Proteins; Hydroxybutyrates; Molecular Chaperones; PHAP protein, Bacteria; Polyesters; Recombinant Proteins; poly-beta-hydroxybutyrate, 26063-00-3
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00992240_v77_n18_p6622_Almeida.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00992240_v77_n18_p6622_Almeida

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Citas:

---------- APA ----------
Almeida, A., Catone, M.V., Rhodius, V.A., Gross, C.A. & Pettinari, M.J. (2011) . Unexpected stress-Reducing effect of PhaP, a poly(3-hydroxybutyrate) granule-associated protein, in Escherichia coli. Applied and Environmental Microbiology, 77(18), 6622-6629.
http://dx.doi.org/10.1128/AEM.05469-11
---------- CHICAGO ----------
Almeida, A., Catone, M.V., Rhodius, V.A., Gross, C.A., Pettinari, M.J. "Unexpected stress-Reducing effect of PhaP, a poly(3-hydroxybutyrate) granule-associated protein, in Escherichia coli" . Applied and Environmental Microbiology 77, no. 18 (2011) : 6622-6629.
http://dx.doi.org/10.1128/AEM.05469-11
---------- MLA ----------
Almeida, A., Catone, M.V., Rhodius, V.A., Gross, C.A., Pettinari, M.J. "Unexpected stress-Reducing effect of PhaP, a poly(3-hydroxybutyrate) granule-associated protein, in Escherichia coli" . Applied and Environmental Microbiology, vol. 77, no. 18, 2011, pp. 6622-6629.
http://dx.doi.org/10.1128/AEM.05469-11
---------- VANCOUVER ----------
Almeida, A., Catone, M.V., Rhodius, V.A., Gross, C.A., Pettinari, M.J. Unexpected stress-Reducing effect of PhaP, a poly(3-hydroxybutyrate) granule-associated protein, in Escherichia coli. Appl. Environ. Microbiol. 2011;77(18):6622-6629.
http://dx.doi.org/10.1128/AEM.05469-11