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J Cell Biol November 13, 2000; 151 (4): 749-62.

Characterization of vertebrate cohesin complexes and their regulation in prophase.

Sumara I , Vorlaufer E , Gieffers C , Peters BH , Peters JM .

In eukaryotes, sister chromatids remain connected from the time of their synthesis until they are separated in anaphase. This cohesion depends on a complex of proteins called cohesins. In budding yeast, the anaphase-promoting complex (APC) pathway initiates anaphase by removing cohesins from chromosomes. In vertebrates, cohesins dissociate from chromosomes already in prophase. To study their mitotic regulation we have purified two 14S cohesin complexes from human cells. Both complexes contain SMC1, SMC3, SCC1, and either one of the yeast Scc3p orthologs SA1 and SA2. SA1 is also a subunit of 14S cohesin in Xenopus. These complexes interact with PDS5, a protein whose fungal orthologs have been implicated in chromosome cohesion, condensation, and recombination. The bulk of SA1- and SA2-containing complexes and PDS5 are chromatin-associated until they become soluble from prophase to telophase. Reconstitution of this process in mitotic Xenopus extracts shows that cohesin dissociation does neither depend on cyclin B proteolysis nor on the presence of the APC. Cohesins can also dissociate from chromatin in the absence of cyclin-dependent kinase 1 activity. These results suggest that vertebrate cohesins are regulated by a novel prophase pathway which is distinct from the APC pathway that controls cohesins in yeast.

PubMed ID: 11076961
PMC ID: PMC2169443
Article link: J Cell Biol

Genes referenced: arhgef7 ccnb1.2 cdc27 cdk1 herpud1 itih3 rad21 rasgrf1 smc3 stag1 stag2
Antibodies: H3f3a Ab9

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Bickel, 1996, Pubmed [+]

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