Characterization of two novel YY1 binding sites in the polyomavirus late promoter

Fabio Martelli, Carla Iacobini, Maurizia Caruso, Armando Felsani

Research output: Contribution to journalArticlepeer-review


NF-D is a ubiquitous nuclear factor that has been shown to bind specifically to a DNA element in the polyomavirus regulatory region. In this report, we demonstrate that NF-D is either identical or very similar to a transcription factor that has been variously named YY1, δ, NF-E1, UCRBP, or CF1. Moreover, we show the presence in the polyomavirus genome of a second DNA motif, located 40 bp from the first, which binds YY1/NF-D with high affinity. Both sites lie downstream of the major late transcription initiation sites. By site-directed mutagenesis, we demonstrate that both elements contribute positively to the activity of the late promoter, probably by a cooperative mechanism. We also demonstrate that the requirement of the YY1/NF-D function for late promoter activity varies with the cell line.

Original languageEnglish
Pages (from-to)1433-1438
Number of pages6
JournalJournal of Virology
Issue number3
Publication statusPublished - 1996

ASJC Scopus subject areas

  • Immunology


Dive into the research topics of 'Characterization of two novel YY1 binding sites in the polyomavirus late promoter'. Together they form a unique fingerprint.

Cite this