Abstract
A plasmid transformation system for Rhodococcus sp. strain H13-A was developed by using an Escherichia coli-Rhodococcus shuttle plasmid constructed in this study. Rhodococcus sp. strain H13-A contains three cryptic indigenous plasmids, designated pMVS100, pMVS200, and pMVS300, of 75, 19.5, and 13.4 kilobases (kb), respectively. A 3.8-kb restriction fragment of pMVS300 was cloned into pIJ30, a 6.3-kb pBR322 derivative, containing the E. coli origin of replication (ori) and ampicillin resistance determinant (bla), as well as a Streptomyces gene for thiostrepton resistance, tsr. The resulting 10.1-kb recombinant plasmid, designated pMVS301, was isolated from E. coli DH1(pMVS301) and transformed into Rhodococcus sp. strain AS-50, a derivative of strain H13-A, by polyethylene glycol-assisted transformation of Rhodococcus protoplasts and selection for thiostrepton-resistant transformants. Thiostrepton-resistant transformants were also ampicillin resistant and were shown to contain pMVS301, which was subsequently isolated and transformed back into E. coli. The cloned 3.8-kb fragment of Rhodococcus DNA in pMVS301 contains a Rhodococcus origin of replication, since the hybrid plasmid was capable of replication in both genera. The plasmid was identical in E. coli and Rhodococcus transformants as determined by restriction analysis and was maintained as a stable, independent replicon in both organisms. Optimization of the transformation procedure resulted in transformation frequencies in the range of 10(5) transformants per micrograms of pMVS301 DNA in Rhodococcus sp. strain H13-A and derivative strains. The plasmid host range extends to strains of Rhodococcus erythropolis, R. globulerus, and R. equi, whereas stable transformants were not obtained with R. rhodochrous or with several coryneform bacteria tested as recipients. A restriction map demonstrated 14 unique restriction sites in pMVS301, some of which are potentially useful for molecular cloning in Rhodococcus spp. and other actinomycetes. This is the first report of plasmid transformation and of heterologous gene expression in a Rhodococcus sp.
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