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Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into the...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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.
Many natural and synthetic polymers are produced by...
Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...

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Polymer Microarrays for High Throughput Discovery of Biomaterials
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Published on: January 25, 2012

Follow the monomer.

James E Bear1

  • 1Lineberger Comprehensive Cancer Center and Department of Cell and Developmental Biology University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA. bear@email.unc.edu

Cell
|May 31, 2008
PubMed
Summary
This summary is machine-generated.

Actin capping proteins surprisingly boost cell motility by promoting Arp2/3 nucleation and branching, not by speeding up filament growth. This reveals a new mechanism for cell movement regulation.

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Area of Science:

  • Cell biology
  • Biophysics
  • Cytoskeleton dynamics

Background:

  • Actin filaments are crucial for cell structure and motility.
  • Capping proteins regulate actin filament length.
  • The paradoxical increase in cell motility with capping proteins was not fully understood.

Discussion:

  • This study challenges the previous hypothesis that capping proteins enhance motility solely by concentrating actin monomers at filament ends.
  • The findings highlight the role of capping proteins in actively promoting new actin structure formation.
  • The reconstituted motility system allowed for precise observation of molecular mechanisms.

Key Insights:

  • Actin filament capping proteins stimulate Arp2/3 complex-mediated nucleation and branching.
  • This stimulation of de novo filament formation is the primary driver of increased cell motility, not enhanced elongation.
  • The study provides a revised mechanistic understanding of how capping proteins influence cell dynamics.

Outlook:

  • Further research can explore the precise molecular interactions between capping proteins and the Arp2/3 complex.
  • Investigating how this mechanism is regulated in different cellular contexts could reveal new insights into cell migration.
  • This work may inform therapeutic strategies targeting cell motility in diseases like cancer metastasis.