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Related Concept Videos

Newman Projections02:06

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.

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High-resolution Single Particle Analysis from Electron Cryo-microscopy Images Using SPHIRE
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Single-particle visualization of assembly: I. Dimerization in a planar zone.

H Wang1, I Wu, Q Yang

  • 1Department of Biochemistry, The University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, USA.

Journal of Microscopy
|January 19, 2005
PubMed
Summary

This study analyzes the association and dissociation of bacteriophage lambda procapsids using real-time single-particle fluorescence microscopy. Findings reveal a molten agarose barrier and non-random dimer orientation influence particle behavior in the concentration plane.

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Area of Science:

  • Biophysics
  • Microscopy techniques
  • Molecular assembly analysis

Background:

  • Single-particle fluorescence microscopy is crucial for studying biological assembly reactions.
  • Previous work utilized molten agarose to concentrate thermally diffusing particles for analysis.

Purpose of the Study:

  • To perform the first real-time, single-particle analysis of association/dissociation for thermally diffusing particles.
  • To investigate the behavior of bacteriophage lambda procapsids in a concentrated solution.

Main Methods:

  • Developed a method to quantify thermal motion of single particles.
  • Applied single-particle fluorescence microscopy to observe procapsid dynamics.
  • Utilized molten agarose to create a concentration plane near a coverglass surface.

Main Results:

  • Quantified thermal motion to determine particle binding.
  • Observed real-time association and dissociation events of bacteriophage lambda procapsids.
  • Identified a molten agarose barrier (93-155 nm from surface) affecting particle diffusion.

Conclusions:

  • The molten agarose creates a confinement barrier influencing particle interactions.
  • Non-random orientation of procapsid dimers in the concentration plane was observed.
  • This method enables detailed analysis of molecular assembly dynamics at the single-particle level.