A folded conformation of MukBEF and cohesin
| Autor: | Byung-Gil Lee, Frank Bürmann, Thane Than, Jan Löwe, Bin Hu, Juri Rappsilber, Ludwig Sinn, Francis J. O’Reilly, Kim Nasmyth, Stanislau Yatskevich |
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| Rok vydání: | 2019 |
| Předmět: |
Regulation of gene expression
Protein Folding Conformational change Saccharomyces cerevisiae Proteins Cohesin Chromosomal Proteins Non-Histone Protein Conformation DNA repair Escherichia coli Proteins Cell Cycle Proteins Chromosomal translocation Saccharomyces cerevisiae Article Repressor Proteins Chromosome segregation chemistry.chemical_compound Protein structure chemistry Structural biology Structural Biology Escherichia coli Biophysics Protein folding Molecular Biology DNA |
| Zdroj: | Nature Structural & Molecular Biology. 26:227-236 |
| ISSN: | 1545-9985 1545-9993 |
| Popis: | Structural maintenance of chromosomes (SMC)-kleisin complexes organize chromosomal DNAs in all domains of life, where they have key roles in chromosome segregation, DNA repair and regulation of gene expression. They function through topological 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: proteobacterial MukBEF and eukaryotic cohesin. 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 favor 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. |
| Databáze: | OpenAIRE |
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