Isolation and characterization of lactose non-utilizing mutants inAspergillus nidulans View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1972-06

AUTHORS

W. Gajewski, J. Litwińska, A. Paszewski, T. Chojnacki

ABSTRACT

A number ofAspergillus nidulans mutants unable to grow on lactose or growing very poorly on this sugar have been isolated. They may be divided into two major groups: to the first belong mutants in which β-galactosidase can be induced by galactose but not by lactose. Mutants of the second group are induced neither by lactose nor by galactose. Mutants of the first group showed an impaired lactose-permease system, while those of the second group most likely concern β-galactosidase structural or regulatory genes as they show a normal rate of lactose uptake. Genetic analysis revealed that mutants from the first group fall into three different loci and those from the second into four loci. No mutant has been found so far with the lactose-permease system and β-galactosidase simultaneously impaired, or with a constitutive level of either activity.The wild-type strain ofAspergillus nidulans grows on lactose as the sole carbon source. The two enzymes necessary for the utilization of lactose, that is lactose permease (which is likely to be a complex system) and β-galactosidase show an inductive response to lactose and galactose (Paszewskiet al., 1970). Mycelia grown on glucose show a low level of permease activity which rises 7–10-fold upon induction by lactose, and no activity of β-galactosidase. Induction of both enzymes is not time-coordinated — the induction of permease preceeds the induction of β-galactosidase. In contrast toNeurospora crassa (Bates and Woodward, 1964; Bateset al., 1967; Lester and Byers, 1965) only one type of β-galactosidase with pH optimum 7.5–7.6 was found inAspergillus nidulans.A number of mutants unable to grow on lactose or growing very poorly on this sugar have been isolated. Their genetic and enzymatic characterization is given in this paper. More... »

PAGES

99-106

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00582220

DOI

http://dx.doi.org/10.1007/bf00582220

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1025705808

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/4558195


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