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Inverted repeats in the DNA of Streptomyces plasmids pMG110 and pMG120

✍ Scribed by Klaus, Siegfried ;Krügel, Hans ;Walter, Friedrich

Publisher: Springer
Year: 1984
Tongue: English
Weight: 1006 KB
Volume: 197
Category: Article
ISSN: 0026-8925
DOI: 10.1007/bf00327935

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✦ Synopsis

Two cryptic plasmids pMG110 (10.5 kb) and pMG120 (14.5 kb) isolated from Streptomyces luteolutescens were cleaved by restriction endonucleases Bg/II, 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 Bg/II- and KpnI-generated fragments allowed the localization of the elements at two alternative positions on the physical map of pMG110.

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