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Related Concept Videos

Centrifugation01:05

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Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
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The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
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Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability
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Variable-Field Analytical Ultracentrifugation: I. Time-Optimized Sedimentation Equilibrium.

Jia Ma1, Michael Metrick1, Rodolfo Ghirlando2

  • 1Dynamics of Macromolecular Assembly Section, Laboratory of Cellular Imaging and Macromolecular Biophysics, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, Maryland.

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|August 20, 2015
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Summary

This study introduces time-optimized sedimentation equilibrium (SE) analytical ultracentrifugation (AUC) to significantly reduce experiment times. The new method uses dynamic centrifugal fields to achieve equilibrium in days instead of weeks, enhancing macromolecular analysis.

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Area of Science:

  • Biophysical chemistry
  • Analytical chemistry
  • Biochemistry

Background:

  • Sedimentation equilibrium (SE) analytical ultracentrifugation (AUC) is crucial for determining macromolecular properties and interactions.
  • A major limitation of SE-AUC is the extensive time required to reach equilibrium, often taking days.

Purpose of the Study:

  • To develop a method for significantly reducing the time required to achieve sedimentation equilibrium in AUC experiments.
  • To optimize experimental protocols for faster and more efficient macromolecular characterization.

Main Methods:

  • Developed time-optimized SE (toSE) using time-varying centrifugal fields and optimized rotor-speed schedules.
  • Employed numerical Lamm equation solutions to model sedimentation in dynamic fields.
  • Introduced the TOSE software for computation and experimental implementation.

Main Results:

  • Achieved sedimentation equilibrium up to 10-fold faster than conventional methods.
  • Enabled extraction of sedimentation coefficient distributions from early data, providing rapid insights into size and homogeneity.
  • Demonstrated real-time adaptation of the toSE experiment for maximized information content and time efficiency.

Conclusions:

  • Time-optimized SE-AUC (toSE) offers a substantial improvement in experimental efficiency for macromolecular analysis.
  • The method provides early information on sample characteristics, aiding in experimental refinement.
  • toSE enhances the utility of AUC for studying complex biological systems efficiently.