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. 1977 Oct;24(1):277–294. doi: 10.1128/jvi.24.1.277-294.1977

Physical and Genetic Characterization of Deletion Mutants of Simian Virus 40 Constructed In Vitro

Charles N Cole 1,†, Terry Landers 1,‡, Stephen P Goff 1, Simone Manteuil-Brutlag 1,†††, Paul Berg 1
PMCID: PMC515929  PMID: 198579

Abstract

Mutants of simian virus 40 (SV40), with deletions ranging in size from fewer than 3 to 750 base pairs located throughout the SV40 genome, were obtained by infecting CV-1P cells with linear SV40 DNA and DNA of an appropriate helper virus. The linear DNA was obtained by complete cleavage of closed circular DNA with Hae II or Bam HI endonuclease or partial cleavage with either Hae III endonuclease or nuclease S1, followed, in some cases, by mild digestion with phage λ 5′ -exonuclease. The following mutants with deletions in the late region of the SV40 genome were obtained and characterized. Ten, containing deletions at the Hae II endonuclease site (map location 0.83), define a new genetic complementation group, E, grow extremely slowly without helper virus, and cause alterations only in VP2. Two mutants with deletions in the region 0.92 to 0.945 affect both VP2 and VP3, demonstrating that VP3 shares sequences with the C-terminal portion of VP2. The mutant with a deletion at 0.93 is the first deletion mutant in the D complementation group and is also temperature sensitive; the mutant with a deletion at 0.94 is viable and grows normally. Three mutants with deletions at the EcoRI endonuclease site (0/1.0) and eleven with deletions at the BamHI endonuclease site (0.15) fall into the B/C complementation group. Six additional mutants with deletions at the BamHI endonuclease site are viable, growing more slowly than wild type. VP1 is the only polypeptide affected by mutants in the B/C group. A mutant with a deletion of the region 0.72 to 0.80 has a polar effect, failing to express the E, D, and B/C genes. Mutants with deletions in the early region (0.67 counterclockwise to 0.17) at 0.66 to 0.59, 0.48, 0.47, 0.33, and 0.285 to 0.205 are all members of the A complementation group. Thus, the A gene is the only viral gene in the early region whose expression is necessary for productive infection of permissive cells. Since mutants with deletions in the region 0.59 to 0.54 are viable, two separate regions are essential for expression of the gene A function: 0.66 to 0.59 and 0.54 to 0.21. Mutants with deletions at 0.21 and 0.18 are viable. Approximate map locations of SV40 genes and possible models for their regulation are discussed.

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These references are in PubMed. This may not be the complete list of references from this article.

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