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. 1981 Jun;146(3):1091–1097. doi: 10.1128/jb.146.3.1091-1097.1981

Isolation and characterization of antibiotic resistance plasmids from thermophilic bacilli and construction of deletion plasmids.

T Imanaka, M Fujii, S Aiba
PMCID: PMC216965  PMID: 6263856

Abstract

Ten plasmids were isolated as covalently closed circular deoxyribonucleic acid from antibiotic-resistant thermophilic bacteria. Of the 10 plasmids tested, 2 could transform Bacillus subtilis, yielding resistance to specific antibiotics. Plasmid pTB20 (2.8 X 10(6) daltons, approximately 24 copies per chromosome) specifies resistance to tetracycline (Tcr), whereas pTB19 (17.2 X 10(6) daltons, approximately 1 copy per chromosome) renders the host resistant to both kanamycin and tetracycline (KMrTcr). Three plasmids were not self-transmissible. The restriction endonuclease cleavage maps of the two plasmids, pTB19 and pTB20, were constructed. pTB19 and pTB20, both of which were originally isolated from thermophilic bacilli, were tested for stability in B. subtilis. Digestion of pTB19 followed by ligation yielded deletion plasmids pTB512 (Kmr), pTB52 (Tcr), and pTB53 (KmrTcr). Determinants of Kmr, Tcr, and DNA replication were associated with EcoRI fragments R1b (4.2 X 10(6) daltons), R3 (2.8 X 10(6) daltons), and R1a (4.2 X 10(6) daltons), respectively. Restriction endonuclease cleavage maps of pTB51, pTB52, and pTB53 were constructed. Tetracycline resistance of pTB20 was confirmed to be in the EcoRI fragment (1.85 X 10(6) daltons).

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Selected References

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