Related Experiment Video
Updated: May 27, 2026
08:00
DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
Published on: October 25, 2017
Polymer physics of the cytoskeleton.
1Institute for Medicine and Engineering, University of Pennsylvania, 1010 Vagelos Laboratories, 3340 Smith Walk, Philadelphia, PA 19104.
Current Opinion in Solid State & Materials Science
|November 15, 2011
Summary
The cytoskeleton, a network of protein filaments like actin and microtubules, is modeled as a complex polymer. Understanding its mechanics offers insights into cell properties and active material behavior.
Area of Science:
- Cell Biology
- Biophysics
- Materials Science
Background:
- The cytoskeleton forms a complex 3D network of actin filaments, microtubules (MT), and intermediate filaments (IF) within cells.
- Cytoskeletal binding proteins regulate filament dynamics, crosslinking, and force application.
- Motor proteins introduce active, non-equilibrium dynamics to the cytoskeleton.
Purpose of the Study:
- To explore modeling the mechanical properties of the cytoskeleton using polymer physics.
- To discuss recent advancements in quantitatively measuring cytoskeletal polymer systems.
- To relate these measurements to the overall mechanical properties of the cell.
Main Methods:
- Applying traditional polymer physics models, modified for biopolymers.
- Considering the cytoskeleton as a composite network of filaments.
- Investigating the role of motor proteins in active material behavior.
Main Results:
- Cytoskeletal mechanics can be approached by treating its components as polymers.
- Active materials, driven by motor proteins, present unique mechanical properties.
- Quantitative measurements are crucial for linking cytoskeletal structure to cell mechanics.
Conclusions:
- Modeling the cytoskeleton as a complex polymer network is a promising approach.
- The active nature of the cytoskeleton opens new avenues for research.
- Further quantitative studies are needed to fully understand cell mechanics.
Related Concept Videos
01:33Introduction to the Cytoskeleton
Overview of the Cytoskeleton
The cytoskeleton is a network of protein filaments present within the cell, having three distinct filaments ̶ microfilaments, microtubules, and intermediate filaments. Each has characteristic features that distinguish them, including the dynamics of their assembly and disassembly, mechanical properties, polarity, and the type of molecular motors associated with them. Earlier, they were thought to be present only in eukaryotic cells; however, their homologs were...
The cytoskeleton is a network of protein filaments present within the cell, having three distinct filaments ̶ microfilaments, microtubules, and intermediate filaments. Each has characteristic features that distinguish them, including the dynamics of their assembly and disassembly, mechanical properties, polarity, and the type of molecular motors associated with them. Earlier, they were thought to be present only in eukaryotic cells; however, their homologs were...
01:17Studying the Cytoskeleton
The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
01:18Assembly of Cytoskeletal Filaments
Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
01:18Polarity of the Cytoskeleton
The intrinsic polarity of cells can be primarily attributed to two factors- i) the asymmetric accumulation of mobile components such are regulatory molecules and subcellular components across the cell and ii) the orientation of polar cytoskeletal filaments that make up the cytoskeletal networks, specifically microfilaments, and microtubules arranged along the axis of polarity. Interactions between the cytoskeletal filaments are crucial for the establishment and maintenance of the polar nature...
01:12Adaptability of Cytoskeletal Filaments
The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
01:16Cytoplasm
The cytoplasm consists of organelles and a framework of protein scaffolds called the cytoskeleton suspended in an aqueous solution, the cytosol. The cytosol is a rich broth of water, ions, salts, and various organic molecules.
Protein Folding and Misfolding
The cytoplasm is the location for several cellular processes, including protein synthesis and folding. The aqueous nature of the cytosol promotes protein folding such that the hydrophobic amino acid side chains are buried in the protein...
Protein Folding and Misfolding
The cytoplasm is the location for several cellular processes, including protein synthesis and folding. The aqueous nature of the cytosol promotes protein folding such that the hydrophobic amino acid side chains are buried in the protein...