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Functional analysis of the Agrobacterium tumefaciens octopine Ti-plasmid left and right T-region border fragments

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Summary

Border fragments of the octopine Ti-plasmid were tested for their ability to restore tumorigenicity of an avirulent mutant carrying a deleted right border. It was found that neither introduction of left border fragments nor that of small right border fragments at the position of the deletion resulted in a complete restoration of oncogenicity. However, insertion of a larger right border fragment in the deletion mutant gave fully oncogenic strains. In the latter case sequences to the right side of the right border repeat were found to be responsible for a complete restoration of oncogenicity. Also a left border repeat inserted together with this enhancer sequence fully restored the oncogenicity of the deletion mutant. The enhancer-sequence on itself was not able to mediate the transfer of the T-region to the plant cell. Border fragments inserted in inverted orientation in the deletion mutant were able to mediate the transfer of the T-region to the plant cell, but at a reduced frequency.

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Authors and Affiliations

  1. Department of Plant Molecular Biology, University of Leiden, Wassenaarseweg 64, 2333 AL, Leiden, The Netherlands

    M. J. J. van Haaren, J. T. Pronk, R. A. Schilperoort & P. J. J. Hooykaas

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  1. M. J. J. van Haaren
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  2. J. T. Pronk
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  3. R. A. Schilperoort
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  4. P. J. J. Hooykaas
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van Haaren, M.J.J., Pronk, J.T., Schilperoort, R.A. et al. Functional analysis of the Agrobacterium tumefaciens octopine Ti-plasmid left and right T-region border fragments. Plant Mol Biol 8, 95–104 (1987). https://doi.org/10.1007/BF00016438

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  • DOI: https://doi.org/10.1007/BF00016438

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