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Related Concept Videos

Studying the Cytoskeleton01:17

Studying 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...
Assembly of Cytoskeletal Filaments01:18

Assembly 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...
Adaptability of Cytoskeletal Filaments01:12

Adaptability 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...
Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker proteins that...

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Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
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Published on: August 31, 2021

An in vitro model system for cytoskeletal confinement.

Sarah Köster1, Thomas Pfohl

  • 1Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, 37073 Göttingen, Germany. sarah.koester@phys.uni-goettingen.de

Cell Motility and the Cytoskeleton
|January 13, 2009
PubMed
Summary

This study reveals how confinement impacts actin filament mechanics. Analyzing thermal fluctuations in a microfluidic system provides a novel method to measure filament persistence length, crucial for cell function.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Polymer Physics

Background:

  • Cellular functions like motility and shape rely on cytoskeletal mechanics.
  • Cytoskeletal filaments (actin, microtubules, intermediate filaments) are confined within the cytoplasm, influencing their thermal fluctuations.
  • Understanding these influences is key to comprehending cellular mechanics.

Purpose of the Study:

  • To investigate the effect of confinement on the thermal fluctuations of individual actin filaments.
  • To develop and apply a novel method for determining filament persistence length.
  • To provide insights into the mechanical properties of biopolymers under geometric constraints.

Main Methods:

  • Utilized a microfluidic in vitro system to study individual actin filaments.
  • Employed fluorescence microscopy to observe and analyze filament behavior.
  • Determined filament persistence length by analyzing the radial distribution function of thermal fluctuations.

Main Results:

  • Successfully measured the persistence length of actin filaments under confinement.
  • Developed a method that does not require complete filament contour reconstruction.
  • Demonstrated applicability to polymers with persistence lengths below optical resolution limits.

Conclusions:

  • Confinement significantly influences cytoskeletal filament mechanics.
  • The developed method offers a versatile approach to measure biopolymer persistence length.
  • This technique advances our understanding of cytoskeletal dynamics in cellular environments.