Rxivist logo

Rxivist combines preprints from bioRxiv with data from Twitter to help you find the papers being discussed in your field. Currently indexing 70,242 bioRxiv papers from 306,709 authors.

DNA-loop extruding condensin complexes can traverse one another

By Eugene Kim, Jacob Kerssemakers, Indra A. Shaltiel, Christian H. Haering, Cees Dekker

Posted 26 Jun 2019
bioRxiv DOI: 10.1101/682864

Condensin, a key member of the Structure Maintenance of Chromosome (SMC) protein complexes, has recently been shown to be a motor that extrudes loops of DNA. It remains unclear, however, how condensin complexes work together to collectively package DNA into the chromosomal architecture. Here, we use time-lapse single-molecule visualization to study mutual interactions between two DNA-loop-extruding yeast condensins. We find that these one-side-pulling motor proteins are able to dynamically change each other's DNA loop sizes, even when located large distances apart. When coming into close proximity upon forming a loop within a loop, condensin complexes are, surprisingly, able to traverse each other and form a new type of loop structure, which we term Z loop, three double-stranded DNA helices aligned in parallel with one condensin at each edge. These Z-loops can fill gaps left by single loops and can form symmetric dimer motors that reel in DNA from both sides. These new findings indicate that condensin may achieve chromosomal compaction using a variety of looping structures.

Download data

  • Downloaded 1,420 times
  • Download rankings, all-time:
    • Site-wide: 4,583 out of 70,260
    • In biophysics: 126 out of 2,989
  • Year to date:
    • Site-wide: 1,631 out of 70,260
  • Since beginning of last month:
    • Site-wide: 3,039 out of 70,260

Altmetric data

Downloads over time

Distribution of downloads per paper, site-wide


Sign up for the Rxivist weekly newsletter! (Click here for more details.)