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Further Observations on the Structure of Particles of Potato Virus X

Carnegie Laboratory of Physics, University of Dundee, Dundee DD1 4HN, Scotland

J. B. Bancroft

Department of Plant Sciences, University of Western Ontario, London, Ontario, Canada

X-ray diffraction studies of oriented specimens of potato virus X, and optical diffraction from electron micrographs of individual particles, are consistent with a helical structure which repeats in eight turns of the helix as proposed by Horne et al. (1975). The studies further suggest that there are 8q + 7 protein subunits in the repeat period, and that the probable number of subunits in eight turns is 71.

Received 28 September 1979; accepted 8 February 1980.