Nup-PI: the nucleopore-promoter interaction of genes in yeast

Mol Cell. 2006 Feb 3;21(3):379-91. doi: 10.1016/j.molcel.2005.12.012.


Our previous work identified the inner basket of the NPC as a physical activation/protection station for force-tethered, epigenetically silenced genes. Here we show that a specific nucleopore-to-gene-promoter interaction (Nup-PI) is an early physiological event of gene activation. Nup-PI was discovered with chromatin endogenous cleavage (ChEC) experiments that mapped in vivo the genomic interaction sites of the nucleoporin Nup2p fused to microccocal nuclease (Nup2-MN). Strong Nup-PI, cleavage by Nup2-MN, is observed at the promoters of the GAL genes and at HXK1 upon activation of these genes with galactose. Nup-PI at the GAL locus requires Gal4p and the UASg and TATA box elements but not SAGA and active transcription. The physical, activation-dependent interaction of the GAL locus with the NPC basket was confirmed by imaging. Chromosome-wide ChEC studies indicated that Nup-PI occurs at numerous genes. The data identify the NPC basket as a new, integral participant in gene expression.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Chromatin / metabolism
  • Chromosomes, Fungal
  • Gene Expression Regulation, Fungal*
  • Nuclear Pore / metabolism*
  • Nuclear Pore Complex Proteins / genetics
  • Nuclear Pore Complex Proteins / metabolism*
  • Oligonucleotide Array Sequence Analysis
  • Promoter Regions, Genetic*
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae / metabolism
  • Saccharomyces cerevisiae Proteins / genetics
  • Saccharomyces cerevisiae Proteins / metabolism*
  • Transcription, Genetic
  • Transcriptional Activation


  • Chromatin
  • NUP2 protein, S cerevisiae
  • Nuclear Pore Complex Proteins
  • Saccharomyces cerevisiae Proteins

Associated data

  • GEO/GSE3756