Aleksenko A Y, Makarova N A, Nikolaev I V, Clutterbuck A J
Genetics Laboratories, University of Glasgow, Scotland, UK.
Curr Genet. 1995 Oct;28(5):474-7. doi: 10.1007/BF00310818.
A wild isolate of Penicillium canescens was subjected to mutagenesis, and 150 chlorate-resistant mutants were isolated and classified in respect of their ability to utilize various nitrogen sources. Strains supposedly deficient in nitrate reductase have been transformed with the nitrate-reductase gene from Aspergillus niger. Transformation probably occurred by non-homologous integration of the transforming vector into the chromosome. Co-transformation with the AMA 1 replicating element from A. nidulans enhanced transformation frequency up to 2000-fold, and was shown to result in autonomous maintenance of replicating concatenates, one of which was re-isolated by transformation of E. coli.