A folded conformation of MukBEF and Cohesin

F Buermann, B Lee, T Than, L Sinn, FJ O'Reilly, S Yatskevich, J Rappsilber, B Hu, K Nasmyth, J Lowe* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

Structural maintenance of chromosomes (SMC)-kleisin complexes organize chromosomal DNAs in all domains of life, with key roles in chromosome segregation, DNA repair and regulation of gene expression. They function through the entrapment and active translocation of DNA, but the underlying conformational changes are largely unclear. Using structural biology, mass spectrometry and cross-linking, we investigated the architecture of two evolutionarily distant SMC-kleisin complexes: MukBEF from Escherichia coli, and cohesin from Saccharomyces cerevisiae. We show that both contain a dynamic coiled-coil discontinuity, the elbow, near the middle of their arms that permits a folded conformation. Bending at the elbow brings into proximity the hinge dimerization domain and the head-kleisin module, situated at opposite ends of the arms. Our findings favour SMC activity models that include a large conformational change in the arms, such as a relative movement between DNA contact sites during DNA loading and translocation
Original languageEnglish
Pages (from-to)227-236
Number of pages10
JournalNature Structural & Molecular Biology
Volume26
Issue number3
DOIs
Publication statusPublished - 4 Mar 2019

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