Mumps Virus Replication in Chick Embryo Lung Cells: Properties of Ribonucleic Acids in Virions and Infected Cells (original) (raw)

J Virol. 1971 Aug; 8(2): 161–173.

aLaboratories of Virology and Immunology, St. Jude Children's Research Hospital, and University of Tennessee Medical Units, Memphis, Tennessee 38101

2 Present address: Department of Virology, The University of Texas M. D. Anderson Hospital & Tumor Institute, Houston, Tex. 77025.

1 Part of this work was taken from a dissertation by J.L.E. in partial fulfillment of the requirements for the Ph.D. degree from the University of Tennessee, Memphis.

Abstract

Ribonucleic acid (RNA) species in mumps virions and in infected cells were compared. The predominant RNA species in virions labeled with 3H-uridine sedimented at 50_S_; RNA species sedimenting at 28, 18, and about 10_S_ were also present. The virion-associated RNA species sedimenting slower than 50_S_ contained some nucleotide sequences similar to 50_S_ virion RNA. Although mumps virus replication was severely inhibited by high concentrations of actinomycin D, some virus was made, and virus-specific RNA species accumulated in infected cells. Mumps virus resembled other paramyxoviruses in inducing, in infected cells, synthesis not only of 50_S_ RNA but also of slower sedimenting RNA species with a peak distribution at about 18_S_, complementary in base sequences to 50_S_ virion RNA. In addition, base sequences of the parental type were relatively abundant in the RNA species sedimenting slower than 50_S_; these may represent precursors of the slowly sedimenting RNA species associated with virions. Ribonuclease-resistant RNA was detected in infected cells; this may represent replicative or transcriptive intermediates. Inhibition of protein synthesis with cycloheximide severely depressed accumulation of labeled 50_S_ RNA in infected cells but did not interfere with accumulation of RNA species sedimenting slower than 50_S_. Actinomycin D treatment had a similar effect. Annealing of genomes and virus-induced complementary RNA species of Newcastle disease virus, Sendai virus, and mumps virus did not reveal any base sequence homologies.

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