Restriction endonuclease mapping of unintegrated viral DNA of B- and N-tropic BALB/c murine leukemia virus.

Abstract:

:Unintegrated linear and closed circular DNAs of B- and N-tropic endogenous BALB/c murine leukemia virus (MuLV) were extracted from newly infected mouse cells and cleaved with EcoRI, XhoI, PvuI, HindIII, SalI, XbaI, KpnI, SmaI, and PstI restriction endonucleases. The DNA fragments were separated by electrophoresis and analyzed by the Southern blot hybridization procedure. EcoRI did not cleave the two genomes. A physical map of 15 cleavage sites on B- and N-tropic genomes was constructed with the other restriction endonucleases. Identical cleavage sites of B- and N-tropic MuLV DNAs were found with all these enzymes. However, the N-tropic linear genome was found to lack about 75 base pairs at each end of the molecule. PstI, KpnI, and SmaI recognize a cleavage site at both ends of the linear molecules. And sequences derived from the 5' end of the RNA genome were found in the third left end of the linear DNA and at its extreme right-end terminus, suggesting the presence of redundant sequences. Two species of closed circular viral DNA were observed. The larger species has the same size as the linear molecule and appears to be a circularized form of linear DNA. The smaller species contains sequences common to both the linear and the larger circular viral DNA but seems to be deleted from sequences present at either one or both ends of the linear DNA. Therefore, the general structure of the linear and circular DNA species of these B- and N-tropic endogenous BALB/c MuLV appears analogous to the structure found with other retroviruses.

journal_name

J Virol

journal_title

Journal of virology

authors

Rassart E,Jolicoeur P

doi

10.1128/JVI.35.3.812-823.1980

subject

Has Abstract

pub_date

1980-09-01 00:00:00

pages

812-23

issue

3

eissn

0022-538X

issn

1098-5514

journal_volume

35

pub_type

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