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. 1986 Jan;51(1):126–131. doi: 10.1128/aem.51.1.126-131.1986

Transformation and transfection of anthracycline-producing streptomycetes.

J S Lampel, W R Strohl
PMCID: PMC238828  PMID: 3456737

Abstract

Streptomyces peucetius and Streptomyces strain C5, producers or anthracycline antibiotics, were converted to protoplasts from vegetatively growing mycelia. Conditions are described for maximal protoplast formation (greater than 99%) and for regeneration frequencies of up to 13%. Streptomycete plasmids pIJ61, pIJ702, and pIJ922, from the replicons SLP1, pIJ101, and SCP2, respectively, were isolated from Streptomyces lividans 66 and successfully introduced into S. peucetius and Streptomyces strain C5 by polyethylene glycol-mediated protoplast transformation. Frequencies of up to 10(6) transformations X microgram of plasmid DNA-1 were achieved by these procedures. Analyses showed that the two anthracycline-producing strains can stably harbor the plasmids without deletion of plasmid sequences or loss of the plasmids for several transfers through selective media. Fragments of DNA from S. peucetius ligated into pIJ702 and introduced into Streptomyces strain C5 were stable after several transfers through selective media. Both anthracycline producers also were sensitive to infection and transfection by actinophages KC401 and KC515, clear plaque derivatives of bacteriophage phi C31. Optimal conditions were determined for the transfection of S. peucetius and Streptomyces strain C5 protoplasts with phi C31 KC401 and KC515 DNA with liposome-assisted, polyethylene glycol-mediated protoplast transfection.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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