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An Invertebrate Calici-like Virus: Evidence for Partial Virion Disintegration in Host Excreta

Department of Plant Pathology, University of California, Berkeley
and¹ Stored Product Insects Research Laboratory, AR, SEA, USDA, Fresno, California, U.S.A.

A virus with morphological and physicochemical properties similar to those of the vertebrate caliciviruses was isolated from navel orangeworms, Amyelois transitella (Walker). Infected larvae contained two types of virus particles: a 185S, 38 nm cupped particle (ACSVi) with a single major polypeptide of 70000 mol. wt. and a 165S, 28 nm smooth particle (ACSVii) with a single major polypeptide of 29000 mol. wt. Larval frass contained a heterogeneous population of virus particles. Evidence is presented which suggests that the 38 nm particle degrades by proteolytic digestion to produce predominantly 28 nm particles in frass. Virus particles contained a single-stranded RNA of 36S (about 2.5 x 10⁶ mol. wt.).

Keywords: invertebrate RNA virus, calicivirus, virion disintegration

Received 17 September 1981; accepted 15 December 1981.