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LuMPIS: luciferase-based MBP-pull-down protein interaction screening system.

María G Vizoso Pinto1, Armin Baiker

  • 1Department of Virology, Max von Pettenkofer-Institute, Pettenkoferstr. 9a, Münich 80336, Germany. vizoso@mvp.uni-muenchen.de

Methods in Molecular Biology (Clifton, N.J.)
|December 2, 2011
PubMed
Summary

The LuMPIS protocol identifies protein-protein interactions (PPIs) in mammalian cells. This method uses maltose binding protein (MBP) and eGFP-luciferase (eGFP-luc) tags for efficient detection and economic pull-down assays.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Understanding protein function often involves identifying interaction partners.
  • Existing methods for detecting protein-protein interactions (PPIs) can be costly and may not efficiently detect low-expression proteins.

Purpose of the Study:

  • To introduce and validate the Luminescence-based Mammalian Protein-Interaction System (LuMPIS) protocol.
  • To provide an efficient, cost-effective, and sensitive method for detecting PPIs in a mammalian cell context.

Main Methods:

  • The LuMPIS protocol involves expressing bait and prey proteins with N-terminal maltose binding protein (MBP) and eGFP-luciferase (eGFP-luc) tags, respectively.
  • Protein interactions are detected via pull-down of MBP-tagged prey using amylose beads, followed by bioluminescence detection of bound eGFP-luc-tagged bait.
  • Transfection efficiency is qualitatively controlled using fluorescence microscopy of the eGFP-luc tag.

Main Results:

  • LuMPIS allows PPI detection within the native mammalian cellular environment.
  • The use of long tags (MBP and eGFP-luc) enhances the expression of genes with typically low expression levels.
  • Amylose bead pull-down is more economical than methods using sepharose beads and antibodies.

Conclusions:

  • The LuMPIS protocol offers a robust and cost-effective approach for studying PPIs in mammalian cells.
  • This method improves the detection of interactions involving low-expression proteins and provides a reliable control for experimental setup.