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Related Concept Videos

Micelles01:30

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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
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Cryo-TEM structural analysis of conjugated nonionic engineered-micelles.

Guy Patchornik1, Ellen Wachtel, Ellina Kesselman

  • 1Department of Biological Chemistry, Ariel University, 70400, Israel. guyp@ariel.ac.il.

Soft Matter
|May 31, 2014
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Summary
This summary is machine-generated.

Engineered micelles, used for protein purification, change shape upon conjugation. Different detergents lead to distinct structures like threads or lamellar vesicles, revealing key morphological transformations.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Structural Biology

Background:

  • Engineered micelles are effective for membrane protein purification and solubilizing hydrophobic compounds.
  • Previous studies have not explored the morphological changes in micelles after conjugation.

Purpose of the Study:

  • To investigate the structural transformations of engineered micelles following conjugation with a hydrophobic metal complex.
  • To correlate detergent type with the resulting micelle morphology.

Main Methods:

  • Utilized cryogenic transmission electron microscopy (cryo-TEM) with rapid sample vitrification.
  • Conjugated engineered micelles with the [(bathophenanthroline)3:Fe(2+)] hydrophobic complex.

Main Results:

  • Octyl β-D-glucopyranoside (OG), octyl β-D-thioglucopyranoside (OTG), and pentaethylene glycol monododecyl ether (C12E5) formed condensed thread-like aggregates.
  • β-D-maltoside (DM), n-dodecyl β-D-maltoside (DDM), and β-D-glucopyranoside (DDG) resulted in lamellar structures, including stacked lamellae and multilamellar vesicles (MLVs).
  • These transformations occurred under mild conditions (low detergent concentration, neutral pH, no temperature change, no precipitants).

Conclusions:

  • The choice of nonionic detergent significantly influences the post-conjugation morphology of engineered micelles.
  • Cryo-TEM successfully captured rapid structural changes, providing insights into micelle architecture.
  • These findings are crucial for optimizing micelle-based applications in protein purification and drug delivery.