Abstract
Restricted mengovirus replication in Mandin-Darby bovine kidney (MDBK) cells is characterized by a 400-fold reduction in infectious virus yield and a 40-fold increase in the production of noninfectious virus. Using conditions which insure that all MDBK cells are infected, virus-specific RNA and protein synthesis were measured in the restrictive host and in a permissive host for mengovirus, HeLa cells. Labeling kinetics and sucrose gradient analysis of mengovirus-specific RNA from MDBK cells show a reduction of 10-fold in virion RNA, 5-fold in double-stranded RNA, and 12.5-fold in single-stranded RNA. The viral RNA biosynthetic processes which occur late in the replicative cycle and result in the production of 90% of the single-stranded viral RNA that is packaged into capsid proteins in the permissive host are absent in restrictive MDBK cells. Viral protein synthesis as measured by labeled viral-specific polysome is decreased, and there is an accumulation of 80S subviral particles in the restricted host. It is suggested that restriction may act at a number of stages of viral replication and maturation.
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