Catalase activity is necessary for heat-shock recovery in Aspergillus nidulans germlings

To understand the molecular mechanisms induced by stress that contribute to the development of tolerance in eukaryotic cells, the filamentous fungus Aspergillus nidulans has been chosen as a model system. Here, the response of A. nidulans germlings to heat shock is reported. The heat treatment drama...

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Published inMicrobiology (Society for General Microbiology) Vol. 145; no. 11; pp. 3229 - 3234
Main Authors Noventa-Jordao, M.A, Couto, R.M, Goldman, M.H.S, Aguirre, J, Iyer, S, Caplan, A, Terenzi, H.F, Goldman, G.H
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Published Reading Soc General Microbiol 01.11.1999
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Abstract To understand the molecular mechanisms induced by stress that contribute to the development of tolerance in eukaryotic cells, the filamentous fungus Aspergillus nidulans has been chosen as a model system. Here, the response of A. nidulans germlings to heat shock is reported. The heat treatment dramatically increased the concentration of trehalose and induced the accumulation of mannitol and mRNA from the catalase gene catA. Both mannitol and catalase function to protect cells from different reactive oxygen species. Treatment with hydrogen peroxide increased A. nidulans germling viability after heat shock whilst mutants deficient in catalase were more sensitive to a 50 degrees C heat exposure. It is concluded that the defence against the lethal effects of heat exposure can be correlated with the activity of the defence system against oxidative stress.
AbstractList To understand the molecular mechanisms induced by stress that contribute to the development of tolerance in eukaryotic cells, the filamentous fungus Aspergillus nidulans has been chosen as a model system. Here, the response of A. nidulans germlings to heat shock is reported. The heat treatment dramatically increased the concentration of trehalose and induced the accumulation of mannitol and mRNA from the catalase gene catA. Both mannitol and catalase function to protect cells from different reactive oxygen species. Treatment with hydrogen peroxide increased A. nidulans germling viability after heat shock whilst mutants deficient in catalase were more sensitive to a 50 degrees C heat exposure. It is concluded that the defence against the lethal effects of heat exposure can be correlated with the activity of the defence system against oxidative stress.
To understand the molecular mechanisms induced by stress that contribute to the development of tolerance in eukaryotic cells, the filamentous fungus Aspergillus nidulans has been chosen as a model system. Here, the response of A. nidulans germlings to heat shock is reported. The heat treatment dramatically increased the concentration of trehalose and induced the accumulation of mannitol and mRNA from the catalase gene catA. Both mannitol and catalase function to protect cells from different reactive oxygen species. Treatment with hydrogen peroxide increased A. nidulans germling viability after heat shock whilst mutants deficient in catalase were more sensitive to a 50 degrees C heat exposure. It is concluded that the defence against the lethal effects of heat exposure can be correlated with the activity of the defence system against oxidative stress.To understand the molecular mechanisms induced by stress that contribute to the development of tolerance in eukaryotic cells, the filamentous fungus Aspergillus nidulans has been chosen as a model system. Here, the response of A. nidulans germlings to heat shock is reported. The heat treatment dramatically increased the concentration of trehalose and induced the accumulation of mannitol and mRNA from the catalase gene catA. Both mannitol and catalase function to protect cells from different reactive oxygen species. Treatment with hydrogen peroxide increased A. nidulans germling viability after heat shock whilst mutants deficient in catalase were more sensitive to a 50 degrees C heat exposure. It is concluded that the defence against the lethal effects of heat exposure can be correlated with the activity of the defence system against oxidative stress.
Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo and Universidade de Franca, Av. do Café S/N, CEP 14040-903, Ribeirão Preto, São Paulo, Brazil 1 Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil 2 Instituto de Fisiologia Celular-UNAM, Mexico City, Mexico 3 Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID, USA 4 Author for correspondence: Gustavo H. Goldman. Tel: +55 16 6024280/81. Fax: +55 16 6331092/6024280. e-mail: ggoldman{at}usp.br To understand the molecular mechanisms induced by stress that contribute to the development of tolerance in eukaryotic cells, the filamentous fungus Aspergillus nidulans has been chosen as a model system. Here, the response of A. nidulans germlings to heat shock is reported. The heat treatment dramatically increased the concentration of trehalose and induced the accumulation of mannitol and mRNA from the catalase gene catA . Both mannitol and catalase function to protect cells from different reactive oxygen species. Treatment with hydrogen peroxide increased A. nidulans germling viability after heat shock whilst mutants deficient in catalase were more sensitive to a 50 °C heat exposure. It is concluded that the defence against the lethal effects of heat exposure can be correlated with the activity of the defence system against oxidative stress. Keywords: catalase, heat shock, stress tolerance, Aspergillus nidulans Abbreviations: ROS, reactive oxygen species
Author Goldman, M.H.S
Goldman, G.H
Iyer, S
Aguirre, J
Terenzi, H.F
Noventa-Jordao, M.A
Couto, R.M
Caplan, A
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Issue 11
Keywords Oxidative stress
Trehalose
Enzyme
Gene expression
Hydrogen Peroxides
Fungi
Resistance
Peroxidases
Catalase
Aspergillus nidulans
Thermal shock
Mannitol
Fungi Imperfecti
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Snippet To understand the molecular mechanisms induced by stress that contribute to the development of tolerance in eukaryotic cells, the filamentous fungus...
Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo and Universidade de Franca, Av. do Café S/N, CEP 14040-903, Ribeirão Preto,...
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SubjectTerms Action of physical and chemical agents
Aspergillus nidulans
Aspergillus nidulans - drug effects
Aspergillus nidulans - enzymology
Aspergillus nidulans - physiology
Biological and medical sciences
Blotting, Northern
catA gene
Catalase - genetics
Catalase - metabolism
Chromatography, Gas
Fundamental and applied biological sciences. Psychology
Fungal Proteins - genetics
Fungal Proteins - metabolism
Gene Deletion
Heat-Shock Proteins - genetics
Heat-Shock Proteins - metabolism
hydrogen peroxide
Hydrogen Peroxide - pharmacology
mannitol
Mannitol - metabolism
Microbiology
Mycology
plant biochemistry
plant physiology
RNA, Fungal - analysis
RNA, Messenger - analysis
Time Factors
Trehalose - metabolism
Title Catalase activity is necessary for heat-shock recovery in Aspergillus nidulans germlings
URI http://mic.sgmjournals.org/cgi/content/abstract/145/11/3229
https://www.ncbi.nlm.nih.gov/pubmed/10589732
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