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Nup-PI: The Nucleopore-Promoter Interaction of Genes in Yeast

2006; Elsevier BV; Volume: 21; Issue: 3 Linguagem: Inglês

10.1016/j.molcel.2005.12.012

1097-4164

Manfred Schmid, Ghislaine Arib, Caroline Laemmli, Jun‐ichi Nishikawa, Thérèse Durussel, Ulrich K. Laemmli,

Fungal and yeast genetics research

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.