Molecular weight of RNA subunits of Rous sarcoma virus determined by electron microscopy.

Abstract:

:Secondary cultures of chicken embryo fibroblasts were infected with the Schmidt Ruppin strain of Rous sarcoma virus (RSV). Five days after infection, the medium was replaced at 2-h intervals with phosphate-free Eagle medium containing 50 muCi of [32P]orthophosphate per ml. Virus was collected by centrifugation, and the RNA was extracted and denatured with dimethyl sulfoxide, and the 33S subunit RNA was isolated by sucrose gradient centrifugation. The molecular weight of the RSV subunit RNA was determined by length measurement in the electron microscope, by using bacteriophage MS2 RNA as a length marker. Molecules of between 2.5 and 3.3 mum in length made up over 50% of the subunit RNA preparation. In this paper, we define RSV RNA subunits as that RNA released from the 70S RNA complex by dimethyl sulfoxide treatment, which sediments as a peak at 33S. Assuming the molecular weight of MS2 RNA to be 1.2 times 10-6, we calculate the molecular weight of RSV subunit RNA to be 3.12 times 10-6 plus or minus 0.25 times 10-6.

journal_name

J Virol

journal_title

Journal of virology

authors

Jacobson AB,Bromley PA

doi

10.1128/JVI.15.1.161-166.1975

subject

Has Abstract

pub_date

1975-01-01 00:00:00

pages

161-6

issue

1

eissn

0022-538X

issn

1098-5514

journal_volume

15

pub_type

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