Condensin complexes: understanding loop extrusion one conformational change at a time.

Biochem Soc Trans

Division of Structural Biology, The Institute of Cancer Research, London SW7 3RP, U.K.

Published: October 2020

Condensin and cohesin, both members of the structural maintenance of chromosome (SMC) family, contribute to the regulation and structure of chromatin. Recent work has shown both condensin and cohesin extrude DNA loops and most likely work via a conserved mechanism. This review focuses on condensin complexes, highlighting recent in vitro work characterising DNA loop formation and protein structure. We discuss similarities between condensin and cohesin complexes to derive a possible mechanistic model, as well as discuss differences that exist between the different condensin isoforms found in higher eukaryotes.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7609036PMC
http://dx.doi.org/10.1042/BST20200241DOI Listing

Publication Analysis

Top Keywords

condensin cohesin
12
condensin complexes
8
condensin
6
complexes understanding
4
understanding loop
4
loop extrusion
4
extrusion conformational
4
conformational change
4
change time
4
time condensin
4

Similar Publications

SMC motor proteins extrude DNA asymmetrically and can switch directions.

Cell

January 2025

Department of Bionanoscience, Kavli Institute of Nanoscience Delft, Delft University of Technology, Delft, the Netherlands. Electronic address:

Structural maintenance of chromosomes (SMC) complexes organize the genome via DNA loop extrusion. Although some SMCs were reported to do so symmetrically, reeling DNA from both sides into the extruded DNA loop simultaneously, others perform loop extrusion asymmetrically toward one direction only. The mechanism underlying this variability remains unclear.

View Article and Find Full Text PDF

Quantitative imaging of loop extruders rebuilding interphase genome architecture after mitosis.

J Cell Biol

March 2025

Cell Biology and Biophysics Unit, European Molecular Biology Laboratory (EMBL) , Heidelberg, Germany.

How cells establish the interphase genome organization after mitosis is incompletely understood. Using quantitative and super-resolution microscopy, we show that the transition from a Condensin to a Cohesin-based genome organization occurs dynamically over 2 h. While a significant fraction of Condensins remains chromatin-bound until early G1, Cohesin-STAG1 and its boundary factor CTCF are rapidly imported into daughter nuclei in telophase, immediately bind chromosomes as individual complexes, and are sufficient to build the first interphase TAD structures.

View Article and Find Full Text PDF

Chromatin Topological Domains Associate With the Rapid Formation of Tandem Duplicates in Plants.

Adv Sci (Weinh)

December 2024

School of Advanced Agriculture Sciences and School of Life Sciences, Academy for Advanced Interdisciplinary Studies, State Key Laboratory of Protein and Plant Gene Research, Peking University, Beijing, 100871, China.

In eukaryotes, chromatin is compacted within nuclei under the principle of compartmentalization. On top of that, condensin II establishes eukaryotic chromosome territories, while cohesin organizes the vertebrate genome by extruding chromatin loops and forming topologically associating domains (TADs). Thus far, the formation and roles of these chromatin structures in plants remain poorly understood.

View Article and Find Full Text PDF

Chromatin is the complex of DNA and associated proteins found in the nuclei of living organisms. How it is organized is a major research field as it has implications for replication, repair, and gene expression. This review summarizes the current state of the chromatin organization field, with a special focus on chromatin motor complexes cohesin and condensin.

View Article and Find Full Text PDF

Interphase chromatin biophysics and mechanics: new perspectives and open questions.

Curr Opin Genet Dev

February 2025

Institut Curie, PSL Research University, Sorbonne Université, CNRS UMR3664 Laboratoire Dynamique du Noyau, CNRS UMR168 Laboratoire Physique des Cellules et Cancer, 75005 Paris, France. Electronic address:

The physical organization and properties of chromatin within the interphase nucleus are intimately linked to a wide range of functional DNA-based processes. In this context, interphase chromatin mechanics - that is, how chromatin, physically, responds to forces - is gaining increasing attention. Recent methodological advances for probing the force-response of chromatin in cellulo open new avenues for research, as well as new questions.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!