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Title: Heat shock protein-mediated resistance to high hydrostatic pressure in Escherichia coli
Authors: Aertsen, Abram ×
Vanoirbeek, K
De Spiegeleer, Philipp
Sermon, Jan
Hauben, Kristel
Farewell, A
Nystrom, T
Michiels, Christiaan #
Issue Date: 2004
Publisher: Amer soc microbiology
Series Title: Applied and Environmental Microbiology vol:70 issue:5 pages:2660-2666
Abstract: A random library of Escherichia coli MG1655 genomic fragments fused to a promoterless green fluorescent protein (GFP) gene was constructed and screened by differential fluorescence induction for promoters that are induced after exposure to a sublethal high hydrostatic pressure stress. This screening yielded three promoters of genes belonging to the heat shock regulon (dnaK, Ion, clpPX), suggesting a role for heat shock proteins in protection against, and/or repair of, damage caused by high pressure. Several further observations provide additional support for this hypothesis: (i) the expression of rpoH, encoding the heat shock-specific sigma factor sigma(32), was also induced by high pressure; (ii) heat shock rendered E. coli significantly more resistant to subsequent high-pressure inactivation, and this heat shock-induced pressure resistance followed the same time course as the induction of heat shock genes; (iii) basal expression levels of GFP from heat shock promoters, and expression of several heat shock proteins as determined by two-dimensional sodium dodecyl sulfate-polyacrylamide gel electrophoresis of proteins extracted from pulse-labeled cells, was increased in three previously isolated pressure-resistant mutants of E. coli compared to wild-type levels.
URI: 
ISSN: 0099-2240
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Food and Microbial Technology
× corresponding author
# (joint) last author

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