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A deletion derivative of the kalilo senescence plasmid forms hairpin and duplex DNA structures in the mitochondria of Neurospora

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Summary

A novel deletion derivative, Δkal, of the kalilo senescence plasmid from Neurospora intermedia, was recovered from a culture treated with chloramphenicol. The deletion derivative exists in mitochondria as two different, equally abundant forms: a 2.8 kb duplex DNA molecule Δkal-2.8) and a 1.4 kb hairpin form Δkal-1.4). The Δkal-2.8 plasmid contains the 1366 by terminal inverted repeats and a partially duplicated 102 by segment of the unique sequence of the 8.6 kb kalilo plasmid. In contrast, the Δkal-1.4 hairpin plasmid appears to result from the folding of single strands that are generated during the replication of Δkal-2.8. Both forms of Δkal have covalently linked terminal proteins. Sequence analysis suggests that Δkal was generated either by slippage of the tip of a growing strand during the replication of kalilo, or by illegitimate recombination between two copies of the plasmid at non-homologous palindromic sequences that might form cruciform structures. In either case, the deletion process was mediated at least in part by an inverted repeat of 5 by in the unique region of kalilo. Since the terminal segments of kalilo DNA that are implicated in plasmid integration might also form cruciform structures, it is possible, but improbable, that the process that generated the first Δkal molecule is related to that which mediates integration of the plasmid into mitochondrial DNA.

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  1. P. John Vierula

    Present address: Department of Biology, Carleton University, K1S 5B6, Ottawa, Ontario, Canada

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

    P. John Vierula & Helmut Bertrand

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Vierula, P.J., Bertrand, H. A deletion derivative of the kalilo senescence plasmid forms hairpin and duplex DNA structures in the mitochondria of Neurospora . Molec. Gen. Genet. 234, 361–368 (1992). https://doi.org/10.1007/BF00538695

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