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J. Virol., 08 1995, 4693-4701, Vol 69, No. 8
H Moriuchi, M Moriuchi and JI Cohen
Varicella-zoster virus (VZV) open reading frame 10 (ORF10) protein, the
homolog of herpes simplex virus type 1 (HSV-1) VP16, is a virion-
associated transactivator of the VZV immediate-early (IE) gene 62 (IE62)
promoter. VP16 forms a complex with cellular factors (Oct1 and host cell
factor [HCF]) and TAATGARAT elements (found in all HSV-1 IE
promoter/enhancer sequences) to mediate stimulation of IE transcription.
The VZV IE62 promoter also contains three TAATGARAT-like elements.
Mutagenesis studies of the VZV IE62 promoter indicated that TAATGARAT-like
elements contribute to transactivation of the VZV IE62 promoter by ORF10
protein. Other cis-acting elements such as GA-rich and cyclic
AMP-responsive elements were also needed for full transactivation by ORF10
protein. In mobility shift assays, ORF10 protein formed a complex with
either of two TAATGARAT-like elements that lack an overlapping
octamer-binding motif (octa-/TAATGARAT) but not with a TAATGARAT element
with an overlapping octamer-binding motif (octa+/TAATGARAT). In contrast,
VP16 formed a high-affinity ternary complex with an octa+/TAATGARAT element
and a low-affinity complex with octa-/TAATGARAT elements. Addition of
antibodies to ORF10 protein, Oct1, or HCF disrupted the complexes,
demonstrating that ORF10 protein interacts with Oct1 and HCF. These results
suggest that transactivation of the VZV IE62 gene by ORF10 protein and HSV
IE genes by VP16 require similar cellular proteins but distinct cis-acting
elements.
Copyright © 1995, American Society for Microbiology
Proteins and cis-acting elements associated with transactivation of the varicella-zoster virus (VZV) immediate-early gene 62 promoter by VZV open reading frame 10 protein
Laboratory of Clinical Investigation, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland 20892, USA.
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