Efficient transformation by Prague A Rous sarcoma virus plasmid DNA requires the presence of cis-acting regions within the gag gene.

Abstract:

:A region in addition to and outside the long terminal repeats (LTRs) in the gag gene of the Prague A strain of Rous sarcoma virus was found to be essential in cis for efficient cell transformation by cloned viral DNA. Transformation in chicken embryo fibroblasts, which requires infectious virus production and reinfection, was facilitated in cis by sequences between nucleotides 630 and 1659. Efficient transformation of NIH 3T3 cells in which secondary spread of virus is not necessary (as it is in chicken embryo fibroblasts) required sequences between nucleotides 630 and 1149. A src cDNA clone which also lacks this region demonstrated low transformation efficiency, indicating that the role of the cis element cannot be attributed to interference with RNA splicing. The gag gene segment required in cis for transformation, between nucleotides 630 and 1149, could substitute for the simian virus 40 enhancer in either orientation, and cells transfected with Rous sarcoma virus LTR-driven plasmids containing the gag cis element had a two- to threefold increase in steady-state viral RNA levels compared with plasmids lacking this region. Thus, additional cis-acting regulatory elements located outside the viral LTRs may modulate viral gene expression and contribute to the efficiency of cell transformation.

journal_name

J Virol

journal_title

Journal of virology

authors

Stoltzfus CM,Chang LJ,Cripe TP,Turek LP

doi

10.1128/JVI.61.11.3401-3409.1987

subject

Has Abstract

pub_date

1987-11-01 00:00:00

pages

3401-9

issue

11

eissn

0022-538X

issn

1098-5514

journal_volume

61

pub_type

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