Harnessing the Profinity eXact™ System for Expression and Purification of Heterologous Proteins in E. coli

  • Yoav Peleg
  • Vadivel Prabahar
  • Dominika Bednarczyk
  • Tamar Unger
Part of the Methods in Molecular Biology book series (MIMB, volume 1586)


Highly purified recombinant proteins in large quantities are valuable material for biochemical and structural studies. To achieve this goal, versatile tools were developed to increase the expression of the recombinant proteins and to facilitate the purification process. Fusion tags are commonly used for enhancing expression and solubility and some can be used in the purification process. However, these tags may need to be removed by treatment with specific proteases in order to obtain the tag-free protein. The Profinity eXact™ system provides an alternative system for a fusion tag, enhancing expression and purification in one-step. Here we describe a set of new vectors in which the Profinity eXact™ tag, in addition to a 6× His-tag, with or without additional expression-enhancing sequences, could be used in the Profinity eXact™ system. We show that the solubility enhancing tags (Trx, GST, GB1) increase the yield of the purified tested protein compared to the vector containing only a His-tag upstream of the Profinity eXact™ fusion tag.

Key words

Profinity eXact Protein expression Protein purification Profinity vectors 



This research was supported by the Dana and Yossie Holander Center for Structural Proteomics.


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Copyright information

© Springer Science+Business Media LLC 2017

Authors and Affiliations

  • Yoav Peleg
    • 1
  • Vadivel Prabahar
    • 2
  • Dominika Bednarczyk
    • 3
  • Tamar Unger
    • 1
  1. 1.The Israel Structural Proteomics Center (ISPC)Weizmann Institute of ScienceRehovotIsrael
  2. 2.Migal-Galilee Research InstituteKiryat ShmonaIsrael
  3. 3.Department of Bimolecular SciencesWeizmann Institute of ScienceRehovotIsrael

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