Triple SILAC to Determine Stimulus Specific Interactions in the Wnt Pathway

Overview

Journal J Proteome Res

Publisher American Chemical Society

Specialty Biochemistry

Date 2011 Oct 21

PMID 22011079

Citations 35

Authors

Maximiliane Hilger

Matthias Mann

Affiliations

Soon will be listed here.

Abstract

Many important regulatory functions are performed by dynamic multiprotein complexes that adapt their composition and activity in response to different stimuli. Here we employ quantitative affinity purification coupled with mass spectrometry to efficiently separate background from specific interactors but add an additional quantitative dimension to explicitly characterize stimulus-dependent interactions. This is accomplished by SILAC in a triple-labeling format, in which pull-downs with bait, with bait and stimulus, and without bait are quantified against each other. As baits, we use full-length proteins fused to the green fluorescent protein and expressed under endogenous control. We applied this technology to Wnt signaling, which is important in development, tissue homeostasis, and cancer, and investigated interactions of the key components APC, Axin-1, DVL2, and CtBP2 with differential pathway activation. Our screens identify many known Wnt signaling complex components and link novel candidates to Wnt signaling, including FAM83B and Girdin, which we found as interactors to multiple Wnt pathway players. Girdin binds to DVL2 independent of stimulation with the ligand Wnt3a but to Axin-1 and APC in a stimulus-dependent manner. The core destruction complex itself, which regulates beta-catenin stability as the key step in canonical Wnt signaling, remained essentially unchanged.

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