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Observations on the Fine Structure of Lymphocystis Virus from European Flounders and Plaice

D. A. Smail

S. I. Egglestone

^* Regional Virus Laboratory, Ruchill Hospital, Glasgow G20 9NB, Scotland
School of Environmental Sciences, Plymouth Polytechnic, Drake Circus, Plymouth PL4 8AA, England

Lymphocystis virus has been classified with the icosahedral cytoplasmic deoxyriboviruses (ICDVs) but a detailed structure of the virion has not yet been established. Virus from tumours of European plaice and flounders was allowed to decay and this revealed details of its structure. Freshly prepared virus has a hexagonal outline which breaks down to reveal surface subunits 4.5 nm in diam. and a spheroidal core with tubular material 13 nm in diam. inside it. This tubular material appears to have a periodicity suggesting a helical conformation and may be a deoxyribonucleoprotein. No triangular or pentagonal facets, as found with some other ICDVs, were seen. A possible construction of the virus is proposed.

Received 9 November 1977; accepted 3 March 1978.