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Protein Folding01:22

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Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates
06:48

Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates

Published on: January 5, 2024

Three phase partitioning leads to subtle structural changes in proteins.

Gulam Mohmad Rather1, Munishwar Nath Gupta

  • 1Chemistry Department, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.

International Journal of Biological Macromolecules
|June 4, 2013
PubMed
Summary

Three phase partitioning (TPP) uses ammonium sulphate and t-butanol to precipitate proteins. This study found TPP causes only subtle structural changes, confirming its safety for protein purification and refolding.

Keywords:
Circular dichroism of proteinsEnzymes in low water mediaProtein flexibilityProtein purificationProtein refoldingThree phase partitioning

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Last Updated: May 10, 2026

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Area of Science:

  • Biochemistry
  • Protein Chemistry
  • Biophysical Chemistry

Background:

  • Three phase partitioning (TPP) is a technique utilizing ammonium sulphate and t-butanol for protein precipitation.
  • TPP is widely applied for protein purification and refolding.
  • Concerns exist regarding potential structural alterations in proteins after TPP treatment.

Purpose of the Study:

  • To investigate the structural integrity of proteins subjected to TPP.
  • To compare structural parameters of TPP-treated proteins with their native states.
  • To assess the safety and efficacy of TPP for protein processing.

Main Methods:

  • Analysis of thermal stability.
  • Determination of secondary structure content.
  • Measurement of surface hydrophobicity.
  • Assessment of hydrodynamic radii.
  • Evaluation of protein solubility in ammonium sulphate.

Main Results:

  • Structural changes induced by TPP were observed across multiple proteins.
  • These alterations, including thermal stability, secondary structure, surface hydrophobicity, hydrodynamic radius, and solubility, were consistently subtle.
  • No drastic structural deviations from the native state were detected.

Conclusions:

  • Three phase partitioning induces minor structural modifications in proteins.
  • The observed changes are not significant enough to compromise protein integrity.
  • TPP can be safely employed for the purification and refolding of proteins.