The chromosomal DNA of Streptomyces lividans 66 is linear
Article first published online: 27 OCT 2006
Volume 10, Issue 5, pages 923–933, December 1993
How to Cite
Lin, Y.-S., Kieser, H. M., Hopwood, D. A. and Chen, C. W. (1993), The chromosomal DNA of Streptomyces lividans 66 is linear. Molecular Microbiology, 10: 923–933. doi: 10.1111/j.1365-2958.1993.tb00964.x
- Issue published online: 27 OCT 2006
- Article first published online: 27 OCT 2006
- Received 7 August, 1993; accepted 9 August, 1993.
Two copies of a DNA sequence similar or identical to one end of the linear plasmid SLP2 were found on the Streptomyces lividans chromosome. Restriction mapping showed that these sequences represented free ends. Electrophoretic retardation and glass-binding studies indicated that the telomeres carry covalently bound proteins. Moreover, the chromosome migrated as an 8Mb linear DNA in pulsed-field gel electrophoresis. A similar finding with the chromosomes of six other Streptomyces species suggested that a linear chromosome may be characteristic of the genus. The S. lividans chromosome can be circularized by joining the two ends by artificial targeted recombination or by spontaneous deletions spanning both telomeres. Thus the chromosome appears to be able to exist, in viable bacteria, as a linear or a circular molecule.