Summary
When tobacco suspension culture line BY2 cells in stationary phase are transferred into fresh medium, replication of proplastid DNA proceeds for 24 h in the absence of nuclear DNA replication. Replicative intermediates of the proplastid DNA concentrated by benzoylated, naphthoylated DEAE cellulose chromatography, were radioactively labelled and hybridized to several sets of restriction endonuclease fragments of tobacco chloroplast DNA. The intermediates hybridized preferentially to restriction fragments in the two large inverted repeats. Mapping of D-loops and of restriction fragment lengths by electron microscopy permitted the localization of the replication origin, which was close to the 23S rRNA gene in the inverted repeats. The replication origins in both segments of the inverted repeat in tobacco proplastid DNA were active in vivo.
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Communicated by M. Sekiguchi
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Takeda, Y., Hirokawa, H. & Nagata, T. The replication origin of proplastid DNA in cultured cells of tobacco. Molec. Gen. Genet. 232, 191–198 (1992). https://doi.org/10.1007/BF00279996
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DOI: https://doi.org/10.1007/BF00279996