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. 1973 May;11(5):709–720. doi: 10.1128/jvi.11.5.709-720.1973

Structural Rearrangement and Subunit Composition of RNA from Released Soehner-Dmochowski Murine Sarcoma Virions

James L East 1, Patton T Allen 1, John E Knesek 1, James C Chan 1, James M Bowen 1, Leon Dmochowski 1
PMCID: PMC355167  PMID: 4350715

Abstract

Two types of genomic, high-molecular-weight RNA species were found in Soehner-Dmochowski murine sarcoma virions released from virus-induced rat tumor cells grown in tissue culture. The type of RNA species observed depended on the length of exposure of the tumor cells to radioactive precursor. Early RNA of virions labeled up to 4 h with radioactive uridine had a sedimentation coefficient of 50S, and late RNA of virions labeled for 24 h had a sedimentation coefficient of 58S. Thermal transitions of early and late RNA indicated a difference in the configuration or structure of these two types of RNA. The late RNA may represent either a different configurational state of the early RNA or an aggregate molecule of two early RNA components joined together. Heat dissociation revealed that the major subunit of both RNA types was a 28S species, which was not susceptible to degradation by the addition of micrococcal nuclease to virions. A transitional, intermediate RNA species with a sedimentation coefficient of 37 to 40S was detected when early RNA was dissociated by dimethyl sulfoxide or heat at temperatures suboptimal for complete conversion. No free RNA subunit components were detected in virions harvested at intervals as short as 30 s or 5 min. A model for the assembly of genomic RNA from 28S RNA subunits is proposed.

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Selected References

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