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Nucleic Acids Research, 1985, Vol. 13, No. 20 7359-7373
© 1985

Articles

Evidence from cauliflower mosaic virus virion DNA for additional discontinuities in the plus strand

Andrew J. Maule and Colwyn M. Thomas

Department of Virus Research, John Innes Institute Colney Lane, Norwich NR4 7UH, UK

Received July 11, 1985. Revised September 20, 1985. Accepted September 30, 1985.

Two-dimensional electrophoresis of cauliflower mosaic virus (CaMV) virion DNA and analysis of Southern blots using (+) strand-specific probes to the 5' termini of the ß (5.4Kb) and {gamma} (2.6Kb) strands, revealed the presence of molecules in addition to those predicted from the known structure of CaMV DNA. The presence of 8Kb molecules of (+) sense after denaturation suggested that a small proportion of circular molecules have only a single discontinuity in the (+) strand. Other molecules, probably 5' coterminal with the ß strand but smaller than 5.4Kb, indicated that a minority of the circular full length CaMV DNA contain additional gaps in the (+) strand. Consequently, molecules equivalent to the remainder of the ß strand could be identified using a single strand probe for a region towards the 3'-end of the ß strand. Computer analysis of the nucleotide sequence of CaMV DNA in the region of the proposed additional discontinuities revealed regions displaying some homology with the major (+) strand priming sites at the 5' ends of the ß and {gamma} strands. It is our contention that the additional (+) strand molecules of ß specificity are a consequence of minor (+) strand priming sites.


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