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The linear mitochondrial plasmid pClK1 of the phytopathogenic fungus Claviceps purpurea may code for a DNA polymerase and an RNA polymerase

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Summary

Plasmid pClK1, a linear mitochondrial plasmid of Claviceps purpurea, was completely sequenced. The sequence contains two long open reading frames (ORF1, 3291 bp; ORF2, 2910 bp), and at least four smaller ORFs. The potential polypeptide derived from ORF1 shows homology to the family B type DNA polymerases. The product of ORF2 has significant homology to the mitochondrial RNA polymerase of yeast and RNA polymerases from bacteriophages. ORF1 and ORF2 show homology to URF3 and URF1 of the maize plasmids S1 and S2, respectively. No homology to any published protein sequence was found for the smaller ORFs. The origin of the terminal protein attached to the 5′ ends of pClK1 remains open; several alternatives for its origin are discussed. The sequence data as a whole confirm the virus-like character of pClK1 already postulated from structural properties. Thus pClK1 together with S plasmids of maize and several other linear plasmids make up a distinct class of DNA species of plants and fungi probably derived from a common virus-like ancestor.

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  1. Allgemeine Botanik/Mikrobiologie, Botanisches Institut, Westfälische Wilhelms-Universität, Schloßgarten 3, D-4400, Münster, Federal Republic of Germany

    Birgitt Oeser & Paul Tudzynski

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  1. Birgitt Oeser
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  2. Paul Tudzynski
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Communicated by D.M. Lonsdale

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Oeser, B., Tudzynski, P. The linear mitochondrial plasmid pClK1 of the phytopathogenic fungus Claviceps purpurea may code for a DNA polymerase and an RNA polymerase. Mol Gen Genet 217, 132–140 (1989). https://doi.org/10.1007/BF00330952

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  • DOI: https://doi.org/10.1007/BF00330952

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