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| Content Provider | PubMed Central |
|---|---|
| Author | Zhao, Y. Smith, R. H. O'callaghan, D. J. Holden, V. R. |
| Abstract | The UL3 protein of equine herpesvirus 1 (EHV-1) KyA strain is a homolog of the ICP27 alpha regulatory protein of herpes simplex virus type 1 (HSV-1) and the ORF 4 protein of varicella-zoster virus. To characterize the regulatory function of the UL3 gene product, a UL3 gene expression vector (pSVUL3) and a vector expressing a truncated version of the UL3 gene (pSVUL3P) were generated. These effector plasmids, in combination with an EHV-1 immediate-early (IE) gene expression vector (pSVIE) and chimeric EHV-1 promoter-chloramphenicol acetyltransferase (CAT) reporter constructs, were used in transient transfection assays. These assays demonstrated that the EHV-1 UL3 gene product is a regulatory protein that can independently trans activate the EHV-1 IE promoter; however, this effect can be inhibited by the repressive function of the IE gene product on the IE promoter (R. H. Smith, G. B. Caughman, and D. J. O'Callaghan, J. Virol. 66:936-945, 1992). In the presence of the IE gene product, the UL3 gene product significantly augments gene expression directed by the promoters of three EHV-1 early genes (thymidine kinase; IR4, which is the homolog of HSV-1 ICP22; and UL3 [ICP27]) and the promoter of the EHV-1 late gene IR5, which is the homolog of HSV-1 US10. Sequences located at nucleotides -123 to +20 of the UL3 promoter harbor a TATA box, SP1 binding site, CAAT box, and octamer binding site and, when linked to the CAT reporter gene, are trans activated to maximal levels by the pSVIE construct in transient expression assays. Results from CAT assays also suggest that the first 11 amino acids of the UL3 protein are not essential for the regulatory function of the UL3 gene product. |
| Starting Page | 2786 |
| File Format | |
| ISSN | 10985514 |
| e-ISSN | 10985514 |
| Journal | Journal of Virology |
| Issue Number | 5 |
| Volume Number | 69 |
| Language | English |
| Publisher Date | 1995-05-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Virology Immunology Microbiology Insect Science |
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