TFIIIB subunit Bdp1p is required for periodic integration of the Ty1 retrotransposon and targeting of Isw2p to S. cerevisiae tDNAs

Genes Dev. 2005 Apr 15;19(8):955-64. doi: 10.1101/gad.1299105.

Abstract

Retrotransposons are RNA elements that reverse transcribe their RNA genomes and make a cDNA copy that is inserted back into a new genomic location by the element-encoded integrase protein. Ty1 is a long terminal repeat (LTR) retrotransposon in Saccharomyces cerevisiae that inserts into an approximately 700-bp integration window upstream of tRNA genes with a periodicity of approximately 80 bp. ATP-dependent chromatin remodeling by Isw2 upstream of tRNA genes leads to changes in chromatin structure and Ty1 integration site selection. We show that the N terminus of Bdp1p, a component of the RNA polymerase III transcription factor TFIIIB, is required for periodic integration of Ty1 into the integration window. Deletion of the Bdp1p N terminus and mutation of ISW2 result in similar disruption of nucleosome positioning upstream of some tRNA genes, and the N-terminal domain of Bdp1p is required for targeting of Isw2 complex to tRNA genes. This study provides the first example for recruitment of an ATP-dependent chromatin-remodeling factor by a general transcription factor in vivo.

Publication types

  • Comparative Study
  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adenosine Triphosphatases / genetics*
  • Chromatin Assembly and Disassembly / genetics*
  • Chromatin Immunoprecipitation
  • DNA Primers
  • Nucleosomes / genetics
  • Nucleosomes / metabolism
  • Polymerase Chain Reaction
  • Protein Subunits / genetics
  • RNA, Transfer / genetics*
  • Recombination, Genetic / genetics*
  • Retroelements / genetics*
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae Proteins / genetics*
  • Species Specificity
  • Transcription Factor TFIIIB / genetics*
  • Transcription Factors / genetics*

Substances

  • Bdp1 protein, S cerevisiae
  • DNA Primers
  • ISWI protein
  • Nucleosomes
  • Protein Subunits
  • Retroelements
  • Saccharomyces cerevisiae Proteins
  • Transcription Factor TFIIIB
  • Transcription Factors
  • RNA, Transfer
  • Adenosine Triphosphatases