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Portrait of Sara Snogerup Linse

Sara Linse


Portrait of Sara Snogerup Linse

Purification and HDL-like particle formation of apolipoprotein A-I after co-expression with the EDDIE mutant of Npro autoprotease


  • Rebecca Frankel
  • Katja Bernfur
  • Emma Sparr
  • Sara Linse

Summary, in English

Apolipoprotein A-I (ApoA-I) is the major protein constituent of high-density lipoprotein particles, and as such is involved in cholesterol transport and activation of LCAT (the lecithin:cholesterol acyltransferase). It may also form amyloidal deposits in the body, showing the multifaceted interactions of ApoA-I. In order to facilitate the study of ApoA-I in various systems, we have developed a protocol based on recombinant expression in E. coli. ApoA-I is protected from degradation by driving its expression to inclusion bodies using a tag: the EDDIE mutant of Npro autoprotease from classical swine fever virus. Upon refolding, EDDIE will cleave itself off from the target protein. The result is a tag-free ApoA-I, with its N-terminus intact. ApoA-I was then purified using a five-step procedure composed of anion exchange chromatography, immobilized metal ion affinity chromatography, hydrophobic interaction chromatography, boiling and size exclusion chromatography. This led to protein of high purity as confirmed with SDS-PAGE and mass spectrometry. The purified ApoA-I formed discoidal objects in the presence of zwitterionic phospholipid DMPC, showing its retained function of interacting with lipids. The protocol was also tested by expression and purification of two ApoA-I mutants, both of which could be purified in the same manner as the wildtype, showing the robustness of the protocol.


  • Physical Chemistry
  • NanoLund: Center for Nanoscience
  • Biochemistry and Structural Biology
  • MultiPark: Multidisciplinary research focused on Parkinson´s disease

Publishing year





Protein Expression and Purification



Document type

Journal article


Academic Press


  • Biochemistry and Molecular Biology


  • Apolipoprotein A-I
  • Autoprotease
  • Expression
  • Purification
  • High-density lipoprotein




  • ISSN: 1046-5928