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Microbiology 142 (1996), 261-267
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microbiology, Vol 142, 261-267, Copyright © 1996 by Society for General Microbiology

ARTICLES

A gene cloning system for 'Streptomyces toyocaensis'

P Matsushima and RH Baltz
Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285, USA.

We explored different methods of introducing DNA into 'Streptomyces toyocaensis' and Streptomyces virginiae to construct stable recombinant strains. Plasmid pIJ702 isolated from Streptomyces lividans transformed protoplasts of 'S. toyocaensis' at a frequency of 7 x 10(3) transformants (mu g DNA)-1. pIJ702 prepared from 'S. toyocaensis' transformed 'S. toyocaensis' protoplasts at a frequency of 1 center dot 5 x 10(5) (mu g DNA)-1, suggesting that 'S. toyocaensis' expresses restriction and modification. Plasmid pRHB126 was transduced by bacteriophage FP43 into 'S. toyocaensis' at a frequency of 1.2 x 10(-6) (p.f.u)-1. Plasmids pOJ436 and pRHB304 were introduced into 'S. toyocaensis' by conjugation from Escherichia coli S17-1 at frequencies of about 2 x 10(-4) and 1 x 10(-4) per recipient, respectively. Analysis of several exconjugants indicated that pOJ436 and pRHB304 inserted into a unique phiC31 attB site and that some of the insertions had minimal deleterious effects on glycopeptide A47934 production. The results indicate that 'S. toyocaensis' is a suitable host for gene cloning, whereas S. virginiae does not appear to be.


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