Cohesins bind to preferential sites along yeast chromosome III, with differential regulation along arms versus the centric region.
Sister chromatid cohesion is mediated by evolutionary conserved chromosomal proteins, termed "cohesins." Using an extension of chromatin immunoprecipitation, we have analyzed the distribution of cohesins Mcd1/ Sccl and Smc1 along yeast chromosome III. Both proteins occur preferentially at the same approximately 23 positions. Sites in a approximately 50 kb region around the centromere give especially intense signals. Prominent centric region binding appears to emerge from a more even distribution, probably by differential loss of cohesins along the chromosome arms. Cohesin binding peaks correspond closely to peaks of high local AT composition, a base composition periodicity of approximately 15 kb that is distinct from the approximately 50 kb periodicity of base composition isochores, consistent with axis association of cohesins. The methodology described can be used to analyze the distribution of any DNA-binding protein and, via microchips, along entire genomes.
Blat
Y
Y
Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA. blat@fas.harvard.edu
Kleckner
N
N
D002453:Cell Cycle / Q000235:genetics; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002503:Centromere / Q000378:metabolism; D002868:Chromosomal Proteins, Non-Histone; D015825:Chromosomes, Fungal / Q000378:metabolism*; D004271:DNA, Fungal / Q000032:analysis; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism*; D015966:Gene Expression Regulation, Fungal; D016681:Genome, Fungal; D009687:Nuclear Proteins; D010750:Phosphoproteins; D012441:Saccharomyces cerevisiae / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins; D000098550:Structural Maintenance of Chromosome Protein 1
D018797:Cell Cycle Proteins; D002868:Chromosomal Proteins, Non-Histone; D004271:DNA, Fungal; D005656:Fungal Proteins; C490529:MCD1 protein, S cerevisiae; D009687:Nuclear Proteins; D010750:Phosphoproteins; D029701:Saccharomyces cerevisiae Proteins; D000098550:Structural Maintenance of Chromosome Protein 1