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. 1988 Oct;8(10):4018-27.
doi: 10.1128/mcb.8.10.4018-4027.1988.

Sequence and structural requirements of a herpes simplex viral DNA replication origin

D Lockshon  1 , D A Galloway
Affiliations

Sequence and structural requirements of a herpes simplex viral DNA replication origin

D Lockshon et al. Mol Cell Biol. 1988 Oct.

Abstract

Herpes simplex virus (HSV) types 1 and 2 contain two classes of origins of DNA replication, oriS and oriL, which are closely related. A series of plasmids was constructed which contained specifically altered versions of the HSV type 2 oriS replication origin. Their ability to replicate in an in vivo replicon assay allowed a core origin of 75 base pairs (bp) to be defined. It included both arms of a 56-bp palindrome and from 13 to 20 bp of sequence leftward of the palindrome. The AT-rich sequence at the center of the palindrome was essential. Sequences on either side of the core origin enhanced replication. When additional copies of the -AT-dinucleotide were introduced progressively into the center of the palindrome, an oscillating effect on origin function was observed. These and other data implicate a linear rather than a cruciform conformation of the oriS palindrome in the initiation of HSV replication.

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