Summary
Two cryptic plasmids pMG110 (10.5 kb) and pMG120 (14.5 kb) isolated from Streptomyces luteolutescens were cleaved by restriction endonucleases BglII, KpnI, and SalGI. A physical map was constructed for pMG110. After denaturation and intrastrand reannealing, two types of snap-back structures were identified by electron microscopy, differing in the size of the loop (type 1, 1 kb; type 2, 1.6 kb), whereas the stem of both structures was about 190 bp long. Stem-loop structures of similar size were also observed in pMG120. In rare cases, both types of elements were present on the same DNA molecule. The analysis of BglII- and KpnI-generated fragments allowed the localization of the elements at two alternative positions on the physical map of pMG110.
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Klaus, S., Krügel, H. & Walter, F. Inverted repeats in the DNA of Streptomyces plasmids pMG110 and pMG120. Mol Gen Genet 197, 143–149 (1984). https://doi.org/10.1007/BF00327935
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DOI: https://doi.org/10.1007/BF00327935