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. 1984 Jul;51(1):199–207. doi: 10.1128/jvi.51.1.199-207.1984

Structure of defective DNA molecules in Epstein-Barr virus preparations from P3HR-1 cells.

M S Cho, G W Bornkamm, H zur Hausen
PMCID: PMC254418  PMID: 6328039

Abstract

Epstein-Barr virus (EBV), isolated from P3HR-1 cells, induces early antigen and viral capsid antigen upon infection of human B-lymphoblasts. The strong early antigen- and viral capsid antigen-inducing activity is only observed in P3HR-1 virus preparations harboring particles with defective genomes, suggesting that this biological activity is directly associated with the defective DNA population. After infection of EBV genome-carrying Raji or EBV genome-negative BJAB cells, defective genomes of P3HR-1 EBV DNA are replicated in excess, depending on the multiplicity of infecting EBV particles. Hybridization of the DNA from such infected cells with 32P-labeled EBV DNA after HindIII cleavage reveals six hypermolar fragments. Mapping of these fragments shows that they form one defective genome unit containing four nonadjacent regions (alpha, beta, gamma, and delta) of the nondefective P3HR-1 EBV DNA. Two of the segments (alpha and beta) contain ca. 17 and 13 megadaltons, respectively, from the terminal regions of the P3HR-1 genome, whereas the two smaller segments (gamma and delta) contain ca. 3.7 and 3.0 megadaltons, respectively, originating from the central portion of the genome. In the defective molecule, the regions gamma and delta are present in the opposite orientation compared with nondefective P3HR-1 EBV DNA. Tandem concatemers are formed by fusion of the alpha and beta regions. Our model suggests that tandem concatemers of three defective genome units can be packaged into virions in P3HR-1 cells.

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Selected References

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