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Related Concept Videos

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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Mechanism of Lamellipodia Formation01:31

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Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
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Step-Growth Polymerization: Overview01:03

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Updated: May 1, 2026

OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy
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Spatial propagation of protein polymerization.

S I A Cohen1, L Rajah2, C H Yoon2

  • 1Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom and School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|March 25, 2014
PubMed
Summary
This summary is machine-generated.

This study models filamentous protein self-assembly, providing analytical results for spatial aggregation driven by diffusion or growth. Findings link macroscopic behavior to microscopic processes, offering physical limits for aggregation and prion-like spread.

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Area of Science:

  • Biophysics
  • Materials Science
  • Computational Biology

Background:

  • Filamentous protein self-assembly is crucial in biological systems and diseases.
  • Understanding the spatial dynamics of protein aggregation is key to disease mechanisms.

Purpose of the Study:

  • To derive analytical models for the spatial dependence of filamentous protein self-assembly.
  • To validate theoretical predictions against simulations and experimental data.
  • To connect macroscopic aggregation phenomena with underlying microscopic processes.

Main Methods:

  • Derivation of analytical results for diffusion- and growth-dominated aggregation.
  • Validation using Monte Carlo simulations.
  • Comparison with experimental measurements of protein aggregation systems.

Main Results:

  • Analytical solutions describing the spatial evolution of protein aggregation.
  • Identification of distinct spatial propagation regimes (diffusion vs. growth).
  • Experimental validation of the theoretical models for specific protein systems.

Conclusions:

  • The study provides a theoretical framework linking protein self-assembly dynamics to microscopic mechanisms.
  • Results establish physical limits on the spatial propagation of protein aggregates.
  • The findings offer insights into prion-like behavior and protein misfolding diseases.