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. 1986 May;58(2):513–521. doi: 10.1128/jvi.58.2.513-521.1986

Cloning and characterization of oriL2, a large palindromic DNA replication origin of herpes simplex virus type 2.

D Lockshon, D A Galloway
PMCID: PMC252939  PMID: 3009865

Abstract

An origin of replication within the long unique sequence of herpes simplex virus type 2 designated oriL2 has been identified in a position homologous to its type 1 counterpart, oriL1, between map coordinates 0.398 and 0.413. The difficulties encountered in previous attempts to clone both oriL2 and oriL1 in an undeleted form were surmounted by minimizing the growth of the host Escherichia coli, using a recBC sbcB E. coli host, and purifying the full-length plasmid from delected forms by using a novel method which exploits the ability of a palindrome-containing plasmid to adopt a cruciform conformation, thereby decreasing its supercoiling. In a previously developed assay for functional origin activity, oriL2 was localized to a 241-base-pair ApaI-SstII fragment. DNA sequence analysis revealed a 136-base pair, almost perfect palindrome. Comparison with oriL1 showed a very high degree of conservation: the two origins differ in only 16 of the 144-base-pair oriL1 palindromic region. Most significantly, the differences between oriL1 and oriL2 mainly occur in pairs so as to generally preserve the potential for intrastrand base pairing. The central region of oriL2 is homologous with the shorter palindromic structures detected in origins located within the repetitive sequences of the short component of herpes simplex virus type 1 or 2.

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Selected References

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