Table 1.

Interactors of β-catenin detected by MS.

	Protein name	Σ# Unique	Heavy/light SILAC ratio			p-value
Accession		Peptides	Replicate 1	Replicate 2	Replicate 3
Known interactors
P35221	Catenin alpha-1	33	0.003	0.003	0.001	6.71E-07
O60716	Catenin delta-1	4	0.002	0.002	0.001	1.07E-07
Q14192	Four and a half LIM domains protein 2	13	0.001	0.001	0.001	7.27E-10
O14745	Na(+)/H(+) exchange regulatory cofactor NHE-RF1	5	0.025	0.001	0.001	7.15E-05
Q9Y265	RuvB-like 1	19	0.004	0.002	0.001	8.86E-07
P63208	S-phase kinase-associated protein 1	3	0.001	0.020	0.015	3.81E-05
COPI subunits
P53621	Coatomer subunit alpha	19	0.002	0.297	0.001	1.44E-02
P53618	Coatomer subunit beta	7	0.001	0.472	0.001	4.17E-02
P35606	Coatomer subunit beta'	7	0.001	0.001	0.001	1.25E-09
P48444	Coatomer subunit delta	6	0.628	0.035	0.260	8.66E-02
O14579	Coatomer subunit epsilon	3	0.001	0.444	0.001	3.62E-02
Q9Y678	Coatomer subunit gamma-1	11	0.727	0.436	0.001	1.58E-01
P61923	Coatomer subunit zeta-1	3	0.460	0.462	0.423	1.67E-03

Known interactors (accounting for < 2% of the candidate list) and novel candidate interactor COPI of which all subunits were detected.

β-catenin at the Golgi.