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. 1991 Jun;65(6):2829–2838. doi: 10.1128/jvi.65.6.2829-2838.1991

A 269-amino-acid segment with a pseudo-leucine zipper and a helix-turn-helix motif codes for the sequence-specific DNA-binding domain of herpes simplex virus type 1 origin-binding protein.

S Deb 1, S P Deb 1
PMCID: PMC240903  PMID: 1851856

Abstract

The UL9 gene of herpes simplex virus (HSV) codes for a DNA-binding protein (OBP) that interacts sequence specifically with the origin of replication. This protein is essential for HSV DNA replication in cultured cells. The UL9 gene was cloned into a plasmid vector downstream of the SP6 RNA polymerase promoter. By using in vitro transcription and translation systems, a full-length OBP was synthesized. This synthetic protein is recognized by an antiserum generated against the C-terminal decapeptide of OBP and is functionally active in binding to OriS sequence specifically. The in vitro-synthesized protein has sequence specificity for binding similar to that found for the in vivo-generated OBP. A total of 14 in-frame deletion and insertion mutants of the UL9 gene were generated and expressed in vitro. Using these deletion mutants, we determined that the 269-amino-acid stretch defined by amino acids 564 to 832 localizes the OriS-specific DNA-binding domain. The N-terminal boundary is between amino acids 565 and 596, while the C terminus lies between amino acids 833 and 805. This segment contains a helix-turn-helix moiety and a pseudo-leucine zipper, neither of which alone can support DNA binding. The other leucine zipper from amino acids 150 to 173 is not required for the in vitro sequence-specific DNA-binding activity of OBP.

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