title: The yeast Rad6 protein: a mediator of homologous recombination across the scaffold attached region at the replication origin ARS1.
abstract: Here we show that the ubiquitin-conjugating enzyme Rad6p plays a crucial role in locus-specific replacement recombination in the TRP1-ARS1 region. In rad6-1 strains, where this ubiquitination activity is modified, homologous recombination across a 150 bp continuous region is completely abolished. Our results unambiguously identified the ARS1 scaffold attached region (SAR) as being the region where this impediment for replacement recombination is located, since a merging of the location of the recombination impediment and binding properties in a scaffold exchange assay with deletion mutations was observed. Our observations strongly support the notion of torsionally separated chromosomal domains being organized by SARs and scaffold proteins, and being dynamically realigned as a consequence of ubiquitination and proteolysis.
authors.affiliation: Department of Molecular Biology, Odense University, Denmark.
authors.forename: M B
authors.initials: MB
authors.lastname: Markvart
authors.forename: D
authors.initials: D
authors.lastname: Ankerfelt
authors.forename: F
authors.initials: F
authors.lastname: Kirpekar
authors.forename: K
authors.initials: K
authors.lastname: Gulløv
mesh_terms: D002467:Cell Nucleus / Q000378:metabolism; D002875:Chromosomes / Q000378:metabolism; D008025:Ligases / Q000235:genetics*; D008957:Models, Genetic; D016296:Mutagenesis; D009687:Nuclear Proteins / Q000378:metabolism; D011995:Recombination, Genetic; D018741:Replication Origin; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D017384:Sequence Deletion; D044763:Ubiquitin-Conjugating Enzymes
chemical_list: D009687:Nuclear Proteins; D029701:Saccharomyces cerevisiae Proteins; C471606:RAD6 protein, S cerevisiae; D044763:Ubiquitin-Conjugating Enzymes; D008025:Ligases