Reference: Chapard C, et al. (2019) Sister DNA Entrapment between Juxtaposed Smc Heads and Kleisin of the Cohesin Complex. Mol Cell 75(2):224-237.e5

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Abstract


Cohesin entraps sister DNAs within tripartite rings created by pairwise interactions between Smc1, Smc3, and Scc1. Because Smc1/3 ATPase heads can also interact with each other, cohesin rings have the potential to form a variety of sub-compartments. Using in vivo cysteine cross-linking, we show that when Smc1 and Smc3 ATPases are engaged in the presence of ATP (E heads), cohesin rings generate a "SMC (S) compartment" between hinge and E heads and a "kleisin (K) compartment" between E heads and their associated kleisin subunit. Upon ATP hydrolysis, cohesin's heads associate in a different mode, in which their signature motifs and their coiled coils are closely juxtaposed (J heads), creating alternative S and K compartments. We show that K compartments of either E or J type can entrap single DNAs, that acetylation of Smc3 during S phase is associated with J heads, and that sister DNAs are entrapped in J-K compartments.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Chapard C, Jones R, van Oepen T, Scheinost JC, Nasmyth K
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