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The kalilo linear senescence-inducing plasmid of Neurospora is an invertron and encodes DNA and RNA polymerases

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Summary

The nucleotide sequence of kalilo, a linear plasmid that induces senescence in Neurospora by intergrating into the mitochondrial chromosome, reveals structural and genetic features germane to the unique properties of this element. Prominent features include: (1) very long perfect terminal inverted repeats of nucleotide sequences which are devoid of obvious genetic functions, but are unusually GC-rich near both ends of the linear DNA; (2) small imperfect palindromes that are situated at the termini of the plasmid and are cognate with the active sites for plasmid integration into mtDNA; (3) two large, non-overlapping open-reading frames, ORF-1 and ORF-2, which are located on opposite strands of the plasmid and potentially encode RNA and DNA polymerases, respectively, and (4) a set of imperfect palindromes that coincide with similar structures that have been detected at more or less identical locations in the nucleotide sequences of other linear mitochondrial plasmids. The nucleotide sequence does not reveal a distinct gene that codes for the protein that is attached to the ends of the plasmid. However, a 335-amino acid, cryptic, N-terminal domain of the putative DNA polymersse might function as the terminal protein. Although the plasmid has been co-purifed with nuclei and mitochondria, its nucleotide composition and codon usage indicate that it is a mitochondrial genetic element.

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Authors and Affiliations

  1. Department of Microbiology, University of Guelph, N1G 2W1, Guelph, Ontario, Canada

    Benedict Shiu-Shing Chan, Deborah A. Court, P. John Vierula & Helmut Bertrand

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  1. Benedict Shiu-Shing Chan
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  2. Deborah A. Court
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  3. P. John Vierula
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Communicated by C. S. Levings III

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Shiu-Shing Chan, B., Court, D.A., Vierula, P.J. et al. The kalilo linear senescence-inducing plasmid of Neurospora is an invertron and encodes DNA and RNA polymerases. Curr Genet 20, 225–237 (1991). https://doi.org/10.1007/BF00326237

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