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. 1986 May;58(2):475–486. doi: 10.1128/jvi.58.2.475-486.1986

Palindromic structure and polypeptide expression of 36 kilobase pairs of heterogeneous Epstein-Barr virus (P3HR-1) DNA.

H B Jenson, M S Rabson, G Miller
PMCID: PMC252934  PMID: 3009861

Abstract

Among the Epstein-Barr virions (EBV) produced by the P3HR-1 (HR-1) cell line are a defective subpopulation with rearranged viral DNA designated heterogeneous DNA (het DNA). These defective virions are responsible for the capacity of HR-1 virus to induce early antigen in Raji c cells and for trans activation of latent EBV in X50-7 cells. Virions with het DNA are independent replicons which pass horizontally from cell to cell rather than being partitioned vertically. We analyzed the structure and defined several polypeptide products of het DNA to understand these remarkable biologic properties. A 36-kilobase-pair (kbp) stretch of het DNA was cloned (as two EcoRI fragments of 20 and 16 kbp) from virions released from a cellular subclone of HR-1 cells. The unusual aspect of the 20-kbp fragment was the linkage of sequences of BamHI-M and BamHI-B', which are not adjacent on the standard EBV genome. The 16-kbp fragment was a palindrome in which at least two additional recombinations on each side of the palindrome had linked regions of the standard EBV genome which are not normally contiguous. The 20-kbp het DNA fragment was attached to at least one and possibly both ends of the 16-kbp het DNA fragment. We identified antigenic polypeptides produced in COS-1 cells after gene transfer of various cloned het DNA fragments. The 20-kbp fragment encoded a cytoplasmic antigen of about 95 kilodaltons (kDa). The 16-kbp fragment encoded antigens located in the nucleus, nuclear membrane, and cytoplasm. These were represented by several polypeptides, the most prominent of which were about 55, 52, and 36 kDa. The 36-kDa polypeptide was localized to a 2.7-kbp BamHI fragment which had homology to standard BamHI-W and BamHI-Z. Another polypeptide of 50 kDa found in the nucleus was mapped to the 7.1-kbp BamHI het DNA fragment which spans the EcoRI site linking the 20- and 16-kbp fragments of het DNA. Thus, HR-1 het DNA encodes several discrete polypeptide products, one or more of which could be responsible for the unusual biologic properties of the virus. The composition, regulation, and ultimately the expression of some of these products relative to standard EBV is probably altered by the genomic rearrangements of het DNA.

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Selected References

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