Evidence for three differentially regulated catalase genes in Neurospora crassa: effects of oxidative stress, heat shock, and development.
AUTOR(ES)
Chary, P
RESUMO
Genetic and biochemical studies demonstrated that Neurospora crassa possesses three catalases encoded by three separate structural genes. The specific activities of the three enzymes varied in response to superoxide-mediated stress, heat shock, and development. The three loci, which we designated cat-1, cat-2, and cat-3, map to the right arms of chromosomes III, VII, and III, respectively. The cat-1-encoded enzyme (designated Cat-1; estimated molecular weight, 315,000; pI 5.2) was the predominant catalase in rapid-growth mycelium, and its activity was substantially increased in paraquat-treated and heat-shocked mycelium. Cat-2 (Mw, 165,000; pI 5.4) was absent from rapid-growth mycelium but present at low levels in conidia and stationary-phase mycelium. It was the predominant catalase in extracts derived from mycelium that had been heat shocked for 2 h. Cat-3 (Mw, 340,000; pI 5.5) was the predominant catalase in extracts from mature conidia.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=209947Documentos Relacionados
- Two divergent catalase genes are differentially regulated during Aspergillus nidulans development and oxidative stress.
- Heat shock response of Neurospora crassa: protein synthesis and induced thermotolerance.
- Circadian Rhythms in Neurospora crassa: Effects of Saturated Fatty Acids
- Circadian rhythms in Neurospora crassa: effects of unsaturated fatty acids.
- Superoxide Dismutase (Sod-1) Null Mutants of Neurospora Crassa: Oxidative Stress Sensitivity, Spontaneous Mutation Rate and Response to Mutagens
