Cyclic AMP dependent,constitutive thermotolerance in the adenylate cyclase-deficient cr-1 (crisp) mutant of Neurospora crassa |
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Authors: | Angela Kaysel Cruz Hernán F Terenzi João A Jorge Héctor F Terenzi |
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Institution: | (1) Departmento de Biologia da Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, 14049 São Paulo, Brasil;(2) Present address: Departmento de Ciências Morfológicas da Faculdade de Ondotologia de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, 14049 São Paulo, Brasil |
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Abstract: | Summary We investigated the heat shock response of the adenylate cyclase deficient mutant cr-1 (crisp) of Neurospora crassa. This strain was observed to be much more resistant to a lethal temperature of 50 °C than the wild type. This constitutive thermotolerance was absent in cr-1 conidiospores raised on cyclic AMP (cAMP, 2.5 mM) supplemented solid medium, but was partially restored when the conidiospores were germinated at 30 °C, a temperature which fails to induce thermotolerance in the wild-type strain. Two other crisp-like Neurospora mutants, cr-2 and cr-3 which, in contrast to cr-1, contain normal levels of cAMP, did not exhibit the thermotolerance phenomenon observed for cr-1. A cr-1, pe, fl (crisp-microconidial) strain also lacked the ability to tolerate a lethal heat treatment. Our results demonstrate that the adenylate cyclase deficient cr-1 mutant of Neu-rospora crassa expresses a constitutive thermotolerant phenotype as a consequence of its primary genetic defect: low levels of cAMP. |
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Keywords: | Heat shock Cyclic AMP cr-1 mutants Neurospora crassa |
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