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Related Concept Videos

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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SNAREs and Membrane Fusion01:43

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Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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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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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Related Experiment Video

Updated: May 12, 2025

Preparation of Nucleosome Core Particles Complexed with DNA Repair Factors for Cryo-Electron Microscopy Structural Determination
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Coronal Complexation Induces Snowman-Shaped Janus Polymersome Formation.

Rebecca Y Lai1, Chin Ken Wong1, Martina H Stenzel1

  • 1School of Chemistry, University of New South Wales (UNSW), Sydney, 2052, Australia.

Angewandte Chemie (International Ed. in English)
|April 23, 2025
PubMed
Summary

Researchers developed a new method to engineer polymersome shapes using polymer additives. This technique transforms spherical polymersomes into Janus polymersomes, enhancing control over nanoreactor and drug delivery vehicle performance.

Keywords:
Block copolymerComplexationJanusPolymer vesicleShape transformation

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Directed Assembly of Elastin-like Proteins into defined Supramolecular Structures and Cargo Encapsulation In Vitro
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Area of Science:

  • Polymer science and nanotechnology
  • Materials science
  • Biomedical engineering

Background:

  • Polymersome shape is critical for applications like nanoreactors and drug delivery.
  • Existing shape-transformation methods have limitations in polymer composition and shape control.
  • Precise control over nanostructures is essential for advanced material functionalities.

Purpose of the Study:

  • To develop a novel method for transforming polymersome shapes.
  • To create asymmetric Janus polymersomes from spherical precursors.
  • To enhance control over polymersome morphology for specific applications.

Main Methods:

  • Utilized cationic polymer additives and coronal complexation.
  • Transformed charged spherical polymersomes into asymmetric Janus polymersomes.
  • Investigated the role of additive composition and plasticizer content in morphology control.

Main Results:

  • Successfully generated asymmetric Janus polymersomes with a hollow compartment and a protruding bleb.
  • Proposed a dewetting process as the mechanism for bleb formation.
  • Demonstrated enhanced shape control by adjusting additive composition and plasticizer content.

Conclusions:

  • The developed methodology offers a versatile approach to engineering novel polymersome structures.
  • This technique provides precise control over polymersome morphology, advancing their use in nanoreactors and drug delivery.
  • The findings open new avenues for designing advanced functional nanomaterials.