Mutagenesis of Aspergillus oryzae IPT-301 to improve the production of ¥â-fructofuranosidase
Braz. j. microbiol
; 41(1): 186-195, Jan.-Mar. 2010. ilus, graf, tab
Artigo
em Inglês
| LILACS
| ID: lil-531751
Biblioteca responsável:
BR32.1
ABSTRACT
Aspergillus oryzae IPT-301, previously reported as a ¥â-fructofuranosidase producing microorganism, was successfully mutated using UV irradiation at 253.7 nm followed by the screening of survivors resistant to certain stress conditions. Strains were first subjected to the ¥â-fructofuranosidase activity assay using a portion from the colony grown in Petri dish as the enzyme source. Seven mutants with fructofuranosidase activity values relative to the parent culture between 140 -190 percent were selected from survivors grown at temperature of 40¨¬C or 0.018 percent (w/v) sodium dodecyl sulfate concentration. They were cultivated on a rotary shaker to characterize mycelium and extracellular fructosyltransferase activities. Three mutants named IPT-745, IPT-746 and IPT-748 showed the highest amount of mycelium activity whose values increased 1.5 -1.8 fold, compared with the parent strain. It was found that more than 55 percent of total enzyme activity (mycelium- plus extracellular- activity) from these strains was detected in the mycelium fraction. Only one mutant, IPT-747, exceeded the amount of extracellular enzyme exhibited by the parent strain (1.5 times). This mutant also showed the highest value of total fructosyltransferase activity.
Texto completo:
Disponível
Coleções:
Bases de dados internacionais
Base de dados:
LILACS
Assunto principal:
Aspergillus oryzae
/
Transferases
/
Furanos
Idioma:
Inglês
Revista:
Braz. j. microbiol
Assunto da revista:
Microbiologia
Ano de publicação:
2010
Tipo de documento:
Artigo
País de afiliação:
Brasil
/
Cuba
Instituição/País de afiliação:
Instituto Cubano de Investigaciones Azucareras/CU
/
Universidade de São Paulo/BR