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Nucleic Acids Research, Vol 25, Issue 16 3275-3280, Copyright © 1997 by Oxford University Press

ARTICLES

The Cryphonectria parasitica plasmid pUG1 contains a large ORF with motifs characteristic of family B DNA polymerases

E Gobbi, A Carpanelli, G Firrao and R Locci
Dipartimento di Biologia applicata alla Difesa delle Piante, Universita di Udine, Via Scienze 208, Udine I-33100, Italy. micol@pldef.uniud.it

The isolation and characterization of the circular mitochondrial plasmid pUG1 from the ascomycete Cryphonectria parasitica is described. The entire sequence (4182 bp) was obtained and high similarities to DNA- dependent DNA polymerases were revealed. Strikingly common features with the DNA polymerases encoded by the Neurospora intermedia plasmids Fiji and LaBelle, such as matches to the conserved motifs A and B and the presence of TTD instead of DTD in motif C, were found, suggesting the existence of a distinct group of members of the B DNA family polymerases. These strong similarities between the plasmids might suggest a common origin of the C.parasitica and the Neurospora plasmids.
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