Effective identification of Akt interacting proteins by two-step chemical crosslinking, co-immunoprecipitation and mass spectrometry

PLoS One. 2013 Apr 17;8(4):e61430. doi: 10.1371/journal.pone.0061430. Print 2013.

Abstract

Akt is a critical protein for cell survival and known to interact with various proteins. However, Akt binding partners that modulate or regulate Akt activation have not been fully elucidated. Identification of Akt-interacting proteins has been customarily achieved by co-immunoprecipitation combined with western blot and/or MS analysis. An intrinsic problem of the method is loss of interacting proteins during procedures to remove non-specific proteins. Moreover, antibody contamination often interferes with the detection of less abundant proteins. Here, we developed a novel two-step chemical crosslinking strategy to overcome these problems which resulted in a dramatic improvement in identifying Akt interacting partners. Akt antibody was first immobilized on protein A/G beads using disuccinimidyl suberate and allowed to bind to cellular Akt along with its interacting proteins. Subsequently, dithiobis[succinimidylpropionate], a cleavable crosslinker, was introduced to produce stable complexes between Akt and binding partners prior to the SDS-PAGE and nanoLC-MS/MS analysis. This approach enabled identification of ten Akt partners from cell lysates containing as low as 1.5 mg proteins, including two new potential Akt interacting partners. None of these but one protein was detectable without crosslinking procedures. The present method provides a sensitive and effective tool to probe Akt-interacting proteins. This strategy should also prove useful for other protein interactions, particularly those involving less abundant or weakly associating partners.

Publication types

  • Research Support, N.I.H., Intramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Blotting, Western
  • Cell Line, Tumor
  • Cross-Linking Reagents / pharmacology*
  • Enzyme Activation / drug effects
  • Extracellular Signal-Regulated MAP Kinases / chemistry
  • Extracellular Signal-Regulated MAP Kinases / metabolism
  • Immunoprecipitation / methods*
  • Mice
  • Molecular Sequence Data
  • Peptides / chemistry
  • Peptides / metabolism
  • Protein Binding / drug effects
  • Proto-Oncogene Proteins c-akt / chemistry
  • Proto-Oncogene Proteins c-akt / metabolism*
  • Somatomedins / pharmacology
  • Tandem Mass Spectrometry / methods*

Substances

  • Cross-Linking Reagents
  • Peptides
  • Somatomedins
  • Proto-Oncogene Proteins c-akt
  • Extracellular Signal-Regulated MAP Kinases