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In vitro replication of a DNA fragment containing the vicinity of the origin of E. coli DNA replication

✍ Scribed by Nüsslein-Crystalla, Volker ;Scheefers-Borchel, Ursula

Publisher: Springer
Year: 1979
Tongue: English
Weight: 610 KB
Volume: 169
Category: Article
ISSN: 0026-8925
DOI: 10.1007/bf00267542

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✦ Synopsis

The restriction nuclease cleavage pattern of E. coli DNA synthesized in vitro in the cellophane membrane system (Schaller et al., 1972) is similar to the one obtained after labelling E. coli in vivo. This is shown for exponentially growing cells and for cells synchronized by amino acid starvation followed by thymine starvation. In synchronized cells a piece of some 180 kilobase pairs is labelled containing oriC and neighbouring regions at 82 min on the genetic map of E. coli. A pulse label in vitro is incorporated into the same piece of DNA, but the center of this region, i.e. the EcoR1 fragment of 8.6 kbp length which contains the oriC region (Marsh and Worcel, 1977; v. Meyenburg et al., 1977; Yasuda and Hirota, 1977) is missing.

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