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Published in Molecular cell - 28 Jan 2020

Dauban L, Montagne R, Thierry A, Lazar-Stefanita L, Bastié N, Gadal O, Cournac A, Koszul R, Beckouët F

Link to Pubmed [PMID] – 32032532

Mol. Cell 2020 Jan;

Cohesin, a member of the SMC complex family, holds sister chromatids together but also shapes chromosomes by promoting the formation of long-range intra-chromatid loops, a process proposed to be mediated by DNA loop extrusion. Here we describe the roles of three cohesin partners, Pds5, Wpl1, and Eco1, in loop formation along either unreplicated or mitotic Saccharomyces cerevisiae chromosomes. Pds5 limits the size of DNA loops via two different pathways: the canonical Wpl1-mediated releasing activity and an Eco1-dependent mechanism. In the absence of Pds5, the main barrier to DNA loop expansion appears to be the centromere. Our data also show that Eco1 acetyl-transferase inhibits the translocase activity that powers loop formation and contributes to the positioning of loops through a mechanism that is distinguishable from its role in cohesion establishment. This study reveals that the mechanisms regulating cohesin-dependent chromatin loops are conserved among eukaryotes while promoting different functions.

https://www.ncbi.nlm.nih.gov/pubmed/32032532