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Nucleic Acids Research, 1981, Vol. 9, No. 16 3927-3939
© 1981

MOLECULAR BIOLOGY

Electron microscopic mapping of wheat germ RNA polymerase II binding sites on cloned CaMV DNA

F. Grellet+, R. Cooke+, M. Teissere*, M. Delseny+, J. Xech++ and P. Penon+

+Laboratoire de Physiologie Végétale, Université de Perpignan Avenue de Villeneuve, 66025 Perpignan *Laboratoire de Biochimie Végétale Route Léon Lachamp, F-13000 Marseille, France ++Centre de Calcul, Université de Perpignan Avenue de Villeneuve, 66025 Perpignan

Received June 16, 1981. The binding sites of wheat germ RNA polymerase II were mapped on the cloned CaMV genome by observation of enzyme-linear DNA complexes by electron microscopy. Twelve sites are observed. Three of them are relatively stable in the presence of heparin and are found at positions 8–9, 21–23, and 41–44 map units on the physical map of the genome. These positions correspond to AT-rich regions of the viral genome which contain potential promoter sites. These results are discussed with reference to current information on the structure and expression of the CaMV genome.


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