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Cytotechnology

, Volume 61, Issue 3, pp 153–159 | Cite as

Comparison of five commercial extraction kits for subsequent membrane protein profiling

  • Stefanie Bünger
  • Uwe J. Roblick
  • Jens K. HabermannEmail author
Method in Cell Science

Abstract

Membrane proteins account for 70–80% of all pharmaceutical targets emphasizing their clinical relevance. Identification of new, differentially expressed membrane proteins reflecting distinct disease properties is thus of high importance. Unfortunately, isolation and analysis of membrane-bound proteins is hampered by their relative low abundance in total cell lysates, their frequently large size and their hydrophobic properties. We thus aimed to identify protocols that allow for highly efficient isolation and purification of membrane-bound proteins for subsequent protein profiling. We present a comparative study of different membrane protein extraction methods that vary in total protein yield between 0.02 and 4.8 mg using constant cell pellets of the colorectal carcinoma cell line SW620. We also demonstrate by means of polyacrylamide gel electrophoresis (SDS–PAGE) and Western blot analysis that the majority of commercial membrane extraction kits harbor a substantial cytosolic contamination of their membranous fraction. Based on purity of membranous fraction, protein yield, time and costs, we show superiority of two commercial extraction kits for downstream proteome analyses of membrane proteins.

Keywords

Extraction techniques Membrane proteins Commercial kits Sub-cellular fractions Contamination Protein yield 

Notes

Acknowledgments

We’d like to thank Dr. Britta Fritzsche and M.Sc. Timo Gemoll for experimental advice and Katja Klempt-Gießing for technical assistance.

Competing interests statement

The authors declare no competing interests.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Stefanie Bünger
    • 1
  • Uwe J. Roblick
    • 1
    • 2
  • Jens K. Habermann
    • 1
    • 2
    Email author
  1. 1.Laboratory for Surgical Research, Department of SurgeryUniversity of Lübeck, LübeckLübeckGermany
  2. 2.Department of Medical Biochemistry and BiophysicsKarolinska InstituteStockholmSweden

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