Table 2. Proteins That Were Specifically Coimmunoprecipitated with MYC-Tagged APUM24.

Scorea	Protein Name	AGI Code	Distinct Peptides	%AA Coverageb	Total Spectral Intensity
Pre-rRNA processing-related proteins
158.97	Homolog of NOP56	AT1G56110	10	22.0	1.88E+08
72.31	Homolog of NOP58	AT3G05060	5	10.8	3.38E+07
69.58	Homolog of NOP58	AT5G27120	4	7.5	4.33E+07
33.28	BRX1-2	AT1G52930	3	10.6	4.02E+07
28.56	OLI2/NOP2A	AT5G55920	2	2.6	5.66E+07
RP
139.8	RPL4A	AT3G09630	8	25.3	1.24E+08
74.02	RPL8A	AT2G18020	4	20.9	6.95E+07
65.90	RPL5B	AT5G39740	4	15.2	4.40E+07
65.32	RPS13B	AT4G00100	4	33.7	1.62E+08
60.69	RPL14B	AT4G27090	4	34.3	2.16E+08
60.51	RPL6C	AT1G74050	4	15.0	3.99E+07
53.47	RPL3A	AT1G43170	4	9.2	1.28E+07
49.47	RPL7B	AT2G01250	4	19.0	1.55E+08
47.21	RPL23Aa	AT2G39460	3	22.0	4.44E+07
46.39	RPL13aB	AT3G24830	3	14.5	1.22E+08
46.15	RPS18A	AT1G22780	3	15.7	2.88E+07
41.23	RPL12B	AT3G53430	3	22.2	2.04E+08
40.98	RPP0B	AT3G09200	3	10.3	2.18E+07
35.16	RPL90B	AT1G33120	3	13.9	6.04E+08
33.83	RPS15Aa	AT1G07770	3	26.1	1.55E+07
30.41	RPL7A	AT1G80750	3	10.5	3.98E+07
28.11	RPL27C	AT4G15000	3	14.0	2.11E+09
27.53	RPL7aBc	AT3G62870	3	6.2	1.42E+07
26.86	RPL7aAc	AT2G47610	3	6.2	1.09E+07
26.02	RPS14B	AT3G11510	3	14.6	2.79E+07
23.07	RPL18C	AT5G27850	1	5.8	2.55E+07
22.77	RPL11B	AT3G58700	1	7.6	2.12E+07
21.95	RPS6A	AT4G31700	1	6.0	1.09E+07
21.93	RPL15A	AT4G16720	2	10.2	2.24E+07
Others
57.73	ADL1E	AT3G60190	4	9.7	5.13E+07
48.84	Unknown protein	AT5G57120	3	11.5	1.30E+07
45.60	Nhp2-like	AT5G08180	3	14.7	6.91E+07
37.06	ACT2	AT3G18780	3	5.5	4.85E+06
35.52	HSC70-2	AT5G02490	3	4.1	1.58E+08
32.33	DCP1	AT1G08370	3	5.4	6.96E+07
30.27	HTA7	AT5G27670	3	21.3	1.00E+08
27.62	Unknown protein	AT5G09840	3	4.0	2.60E+08
23.93	MAK16 protein-related	AT1G23280	1	4.2	3.86E+06
22.51	Unknown protein	AT3G18600	2	4.5	1.69E+07

^aCalculated by Spectrum Mill (Agilent).

^bAA, amino acid.

^cIndistinguishable.