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Rapid purification method for human SFPQ by implementing zinc-induced polymerization.

Yee Wa Lim1, Mihwa Lee1

  • 1Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, 3086, Australia.

Protein Expression and Purification
|March 22, 2020
PubMed
Summary

Researchers developed a rapid, tag-free purification method for Splicing factor proline- and glutamine-rich (SFPQ) protein. This strategy leverages zinc-induced polymerization for efficient SFPQ isolation in just one day.

Keywords:
Affinity tagRNA-Binding proteinsRapid purificationSFPQZinc-induced polymerization

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Area of Science:

  • Molecular Biology
  • Protein Biochemistry
  • Structural Biology

Background:

  • Splicing factor proline- and glutamine-rich (SFPQ) is a crucial RNA-binding protein involved in gene regulation and subnuclear body organization.
  • SFPQ's functions are complex and its efficient purification has been a challenge for researchers.
  • Recent findings revealed SFPQ's direct binding to zinc, leading to reversible polymerization.

Purpose of the Study:

  • To develop an efficient, tag-free protein purification strategy for SFPQ.
  • To utilize the novel zinc-binding and polymerization property of SFPQ for purification.
  • To reduce the time and complexity of obtaining high-quality SFPQ for further studies.

Main Methods:

  • Exploited the direct zinc-binding property of SFPQ to induce reversible polymerization.
  • Combined zinc-induced precipitation with variations in ionic strength (salting-out) for SFPQ isolation.
  • Purified SFPQ protein within a single day using the developed strategy.
  • Crystallized the purified SFPQ and assessed crystal quality via X-ray diffraction.

Main Results:

  • A rapid purification protocol for SFPQ was successfully established, eliminating the need for affinity tags.
  • The purification process, leveraging zinc-induced polymerization and salting-out, was completed in one day.
  • Purified SFPQ yielded crystals that diffracted to a resolution of 2.22 Å.
  • The quality of the SFPQ protein purified using this method was confirmed by diffraction data.

Conclusions:

  • The zinc-induced polymerization of SFPQ offers a novel and efficient method for its rapid, tag-free purification.
  • This streamlined purification strategy significantly reduces the time required to obtain pure SFPQ.
  • The high-quality SFPQ obtained is suitable for structural studies, such as X-ray crystallography.