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Related Concept Videos

Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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...
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Protein Complex Assembly02:41

Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Protein Folding01:22

Protein Folding

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Overview
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Protein Folding01:25

Protein Folding

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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Related Experiment Video

Updated: Feb 28, 2026

Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Cross-β polymerization and hydrogel formation by low-complexity sequence proteins.

Masato Kato1, Yi Lin1, Steven L McKnight1

  • 1Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9152, USA.

Methods (San Diego, Calif.)
|June 19, 2017
PubMed
Summary
This summary is machine-generated.

Low-complexity (LC) sequences form labile polymers crucial for RNA granule assembly. Hydrogel binding assays provide a method to study these polymers and their interactions within cells.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Low-complexity (LC) sequences are abundant in eukaryotic proteomes, previously thought to lack structure.
  • These LC sequences are critical for forming membrane-less organelles like RNA granules.

Purpose of the Study:

  • To investigate the role of LC sequences in forming labile, cross-β polymers.
  • To establish hydrogel binding assays as a method for studying RNA granule formation.

Main Methods:

  • Production of hydrogel droplets from LC domain polymers.
  • Assessment of LC domain binding to hydrogel droplets using fluorescence microscopy.

Main Results:

  • LC domains of RNA binding proteins readily form labile cross-β polymers under physiological conditions.
  • Formation of these polymers is essential for RNA granule assembly.
  • Hydrogel binding assays reliably assess polymer formation and heterotypic component binding.

Conclusions:

  • LC domain polymerization is a key mechanism driving RNA granule formation.
  • Hydrogel binding assays offer a versatile tool for studying the biophysics of RNA granules.