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. 1979 Jun;30(3):852–862. doi: 10.1128/jvi.30.3.852-862.1979

DNA of Epstein-Barr virus. V. Direct repeats of the ends of Epstein-Barr virus DNA.

D Given, D Yee, K Griem, E Kieff
PMCID: PMC353396  PMID: 225546

Abstract

Previous data indicated that Epstein-Barr virus DNA is terminated at both ends by direct or inverted repeats of from 1 to 12 copies of a 3 X 10(5)-dalton sequence. Thus, restriction endonuclease fragments which include either terminus vary in size by 3 X 10(5)-dalton increments (D. Given and E. Kieff, J. Virol. 28:524--542, 1978; S. D. Hayward and E. Kieff, J. Virol. 23:421--429, 1977). Furthermore, defined fragments containing either terminus hybridize to each other (Given and Kieff, J. Virol. 28:524--542, 1978). The 5' ends of the DNA are susceptible to lambda exonuclease digestion (Hayward and Kieff, J. Virol. 23:421--429, 1977). To determine whether the terminal DNA is a direct or inverted repeat, the structures formed after denaturation and reannealing of the DNA from one terminus and after annealing of lambda exonuclease-treated DNA were examined in the electron microscope. The data were as follows. (i) No inverted repeats were detected within the SalI D or EcoRI D terminal fragments of Epstein-Barr virus DNA. The absence of "hairpin- or pan-handle-like" structures in denatured and partially reannealed preparations of the SalI D or EcoRI D fragment and the absence of repetitive hairpin- or pan-handle-like structures in the free 5' tails of DNA treated with lambda exonuclease indicate that there is no inverted repeat within the 3 X 10(5)-dalton terminal reiteration. (ii) Denatured SalI D or EcoRI D fragments reanneal to form circles ranging in size from 3 X 10(5) to 2.5 X 1O(6) daltons, indicating the presence of multiple direct repeats within this terminus. (iii) Lambda exonuclease treatment of the DNA extracted from virus that had accumulated in the extracellular fluid resulted in asynchronous digestion of ends and extensive internal digestion, probably a consequence of nicks and gaps in the DNA. Most full-length molecules, after 5 min of lambda exonuclease digestion, annealed to form circles, indicating that there exists a direct repeat at both ends of the DNA. (iv) The finding of several circularized molecules with small, largely double-strand circles at the juncture of the ends indicates that the direct repeat at both ends is directly repeated within each end. Hybridization between the direct repeats at the termini is likely to be the mechanism by which Epstein-Barr virus DNA circularizes within infected cells (T. Lindahl, A. Adams, G. Bjursell, G. W. Bornkamm, C. Kaschka-Dierich, and U. Jehn, J. Mol. Biol. 102:511-530, 1976).

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Selected References

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

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