Anthracyclines: isolation of overproducing strains by the selection and genetic recombination of putative regulatory mutants of Streptomycespeucetius var. caesius |
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Authors: | D Segura C Santana R Gosh L Escalante S Sanchez |
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Institution: | (1) Departamento de Biotecnología del Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, México, D.F. 04510 Mexico Tel.: +525 622 3867 Fax: +525 622 38 55 e-mail: sersan@servidor.unam.mx, MX |
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Abstract: | In Streptomyces peucetius var. caesius, the production of anthracyclines was suppressed either by 330 mM d-glucose or 25 mM phosphate. In addition, the anthracycline doxorubicin and the glucose analogue 2-deoxyglucose inhibited
the growth of this microorganism at concentrations of 0.025 mM and 10 mM respectively. Spontaneous and induced mutants, resistant
to the action of these compounds, were isolated, tested and chosen by their ability to overproduce anthracyclines. Genetic
recombination between representative mutants was carried out by the protoplast fusion technique. Some recombinants carrying
resistance to doxorubicin, phosphate and 2-deoxyglucose produced more than 40-fold greater levels of anthracyclines than those
obtained with the parental strain. This improvement resulted in total antibiotic titres of more than 2 g/l culture medium
at 6 days of fermentation.
Received: 14 April 1997 / Received revision: 19 June 1997 / Accepted: 4 July 1997 |
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