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Papers In Press, published online ahead of print July 10, 2003
Microbiology Dept., University at Buffalo, Buffalo, New York 14214
Corresponding Author: ruyechan{at}buffalo.edu
SUMMARY The varicella zoster virus (VZV) IE62 protein is involved in the activation of expression of all three kinetic classes of VZV proteins. Analysis of the viral promoter for VZV glycoprotein I has shown that the cellular factor Sp1 is involved in or required for the observed IE62 mediated activation. Co-immunoprecipitation experiments show that the two proteins are present in a complex in VZV-infected cells. Protein affinity pulldown assays using recombinant proteins showed that IE62 and Sp1 interact in the absence of any other viral and cellular proteins. Mapping studies using GST-fusion proteins containing truncations of IE62 and Sp1 have delimited the interacting regions to amino acids 612-778 in Sp1 and amino acids 226-299 in IE62. The region identified in Sp1 is involved in DNA-binding, synergistic Sp1 activation, and Sp1 interaction with cellular transcription factors. The interacting region identified in IE62 overlaps with or borders on sites involved in interactions with the VZV IE4 protein and the cellular factors TBP and TFIIB. Assays using wild type and mutant promoter elements indicate that Sp1 is involved in recruitment of IE62 to the gI promoter and IE62 enhances Sp1 and TBP binding.
J. Biol. Chem, 10.1074/jbc.M302259200
Submitted on March 4, 2003
Revised on July 10, 2003
Accepted on July 10, 2003
Interaction between the Varicella Zoster virus IE62 major transactivator and cellular transcription factor Sp1
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