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Condensins

Condensins

Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...

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Related Experiment Video

Updated: Feb 24, 2026

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

Exploring Condensins with Magnetic Tweezers.

Rupa Sarkar¹, Valentin V Rybenkov²

¹Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK, 73019, USA.

Methods in Molecular Biology (Clifton, N.J.)

|August 27, 2017

Summary

Condensin proteins, like E. coli MukB, form clusters to loop DNA, reshaping chromosomes. Magnetic tweezers visualize this real-time DNA-protein interaction and dynamic behavior.

Keywords:

Chromatin structure Condensins DNA topology Magnetic tweezers MksB MukB SMC

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Last Updated: Feb 24, 2026

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

Magnetic Tweezers for the Measurement of Twist and Torque

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Published on: May 19, 2014

Author Spotlight: Advanced Single-Molecule Techniques for Investigating Telomeric Protein-DNA Interactions

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Published on: August 30, 2024

Area of Science:

Molecular Biology
Biophysics
Genetics

Background:

Condensins are crucial protein complexes that organize chromosomes.
Their function involves DNA binding and structural remodeling.
Understanding condensin dynamics is key to comprehending genome architecture.

Purpose of the Study:

To investigate the real-time interaction dynamics between Escherichia coli condensin MukB and DNA.
To elucidate how condensins form macromolecular clusters that facilitate DNA looping.

Main Methods:

Utilized magnetic tweezers to observe the real-time behavior of MukB-DNA interactions.
Monitored the dynamic assembly and behavior of condensin clusters on DNA substrates.

Main Results:

Observed that condensins assemble into dynamic macromolecular clusters on DNA.
Demonstrated that these clusters bring distant DNA segments together, forming loops.
Characterized the real-time progression of MukB-DNA interactions.

Conclusions:

Condensin clustering is central to their DNA-looping and chromosome-shaping activity.
Magnetic tweezers provide a powerful method for studying these dynamic molecular processes.
The study reveals insights into the fundamental mechanisms of genome organization.