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Table 4 Mass shifts occurring more frequently on N-terminal ends of proteins

From: Large-scale analysis of post-translational modifications in E. coli under glucose-limiting conditions

Mass Shift

Biol. Replicate

N-terminal

Non-N-Terminal

p-value

+42 Da

1

759 / 1869 (40.61%)

132 / 7860 (1.68%)

0.0

 

2

657 / 1561 (42.09%)

111 / 6814 (1.63%)

0.0

 

3

682 / 1930 (35.34%)

147 / 7681 (1.91%)

0.0

+16 Da

1

1187 / 8016 (14.81%)

13633 / 510869 (2.67%)

0.0

 

2

972 / 6971 (13.94%)

9350 / 385682 (2.42%)

0.0

 

3

531 / 5216 (10.18%)

20571 / 423856 (4.85%)

7.36×10−55

+28 Da

1

16 / 128 (12.50%)

54 / 31261 (0.17%)

4.56×10−24

 

2

27 / 136 (19.85%)

11 / 28221 (0.04%)

1.78×10−55

 

3

45 / 140 (32.14%)

305 / 33420 (0.91%)

1.65×10−54

+156 Da

1

20 / 1051 (1.90%)

277 / 54832 (0.51%)

1.17×10−6

 

2

14 / 832 (1.68%)

154 / 58376 (0.26%)

1.34×10−7

 

3

26 / 674 (3.86%)

313 / 43231 (0.72%)

2.73×10−11

+17 Da

1

60 / 3107 (1.93%)

585 / 178417 (0.33%)

8.94×10−26

 

2

45 / 2730 (1.65%)

512 / 116280 (0.44%)

6.38×10−13

 

3

54 / 2070 (2.61%)

1960 / 147203 (1.33%)

7.64×10−6

+1 Da

1

138 / 6868 (2.01%)

27945 / 2042671 (1.37%)

1.88×10−5

 

2

151 / 5934 (2.54%)

25111 / 1455121 (1.73%)

5.28×10−6

 

3

204 / 6226 (3.28%)

30808 / 1810086 (1.70%)

1.52×10−17

+172 Da

1

15 / 15 (100.00%)

0 / 9431 (0.00%)

3.11×10−48

 

2

1 / 1 (100.00%)

1 / 11114 (0.01%)

1.8×10−4

 

3

14 / 14 (100.00%)

11 / 7365 (0.15%)

2.77×10−37

+64 Da

1

13 / 58 (22.41%)

13 / 1620 (0.80%)

1.84×10−13

 

2

4 / 48 (8.33%)

6 / 1340 (0.45%)

2.27×10−4

 

3

13 / 103 (12.62%)

19 / 2119 (0.90%)

3.58×10−10