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. 1985 Jul;163(1):180–185. doi: 10.1128/jb.163.1.180-185.1985

Efficient plasmid transformation of Streptomyces ambofaciens and Streptomyces fradiae protoplasts.

P Matsushima, R H Baltz
PMCID: PMC219096  PMID: 4008440

Abstract

A procedure for efficient transformation of Streptomyces ambofaciens and Streptomyces fradiae protoplasts with plasmid DNA was developed. Transformation frequencies with S. fradiae protoplasts were strongly influenced by the temperatures for cell growth, protoplast formation, and protoplast regeneration. Transformation frequencies for both species were also influenced by the culture age before protoplast formation, the source and concentration of polyethylene glycol, the transformation-inducing agent, the concentration of protoplasts used in the transformation procedure, and the number of protoplasts added to regeneration plates. Transformation frequencies were substantially higher for both species when calf thymus DNA and protamine sulfate were added to the transformation mix. With S. fradiae, transformation frequencies were much lower with plasmid DNA prepared from other species than with the same plasmids prepared from S. fradiae, suggesting that S. fradiae expresses restriction and modification. With the modified transformation procedures using DNA prepared from homologous hosts, S. ambofaciens and S. fradiae are now transformed routinely at frequencies of 10(6) to 10(7) transformants per micrograms of plasmid DNA.

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Selected References

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