Sulfolobus islandicus plasmids pRN1 and pRN2 share distant but common evolutionary ancestry |
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| Authors: | P J Keeling H-P Klenk Rama K Singh Margret E Schenk Christoph W Sensen Wolfram Zillig W Ford Doolittle |
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| Institution: | (1) Department of Biochemistry, Dalhousie University, Halifax, N.S., Canada, B3H 4H7, CA;(2) National Research Council of Canada – Institute for Marine Biosciences, 1411 Oxford Street, Halifax, N.S., Canada, B3H 3Z1, CA;(3) Max-Plank-Institut für Biochemie, 82152 Martinsried, Germany, DE |
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| Abstract: | The complete sequence of the plasmid pRN2 from the thermoacidophile Sulfolobus islandicus has been determined. The plasmid was found to be circular and 6959 bp in length. S. islandicus harbors another endogenous plasmid, pRN1, and comparison of pRN1 and pRN2 revealed that these two plasmids are essentially
homologous, although very distantly related. pRN1 and pRN2 share several stretches of highly conserved noncoding DNA and three
common open reading frames. Two of these reading frames are likely related to replication, one encoding a large protein with
a helicase domain similar to viral helicases, and the other a copy number control protein, CopG.
Received: November 19, 1997 / Accepted: March 10, 1998 |
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| Keywords: | Archaebacteria Archaea Sulfolobus Plas-mid Thermophile |
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