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Table 1 K-means clusters of DEPs and distribution of proteins involved in each category or subcategory in different clusters

From: Proteomic analysis of maize grain development using iTRAQ reveals temporal programs of diverse metabolic processes

Categories or Subcategories

c0

c1

c2

c3

c4

Total

01 Metabolism

84

95

32

7

29

247

01.01 Carbohydrate metabolism

5

7

9

1

10

32

01.02 Starch synthesis

2

17

3

0

1

23

01.03 Glycolysis

4

15

3

0

2

24

01.04 Pyruvate dehydrogenase complex

1

3

1

0

0

5

01.05 TCA pathway

4

2

2

0

0

8

01.06 Alcoholic fermentation

2

5

0

0

0

7

01.07 Pentose phosphate pathway

6

1

0

0

0

7

01.08 Amino acid metabolism

18

22

5

0

3

48

01.09 Nucleotides metabolism

6

7

2

0

2

17

01.10 Lipid and sterol metabolism

23

9

5

6

7

50

01.11 Secondary metabolism

13

7

2

0

4

26

02 Protein synthesis and destination

124

63

82

15

27

311

02.01 Protein synthesis

56

21

24

0

13

114

02.02 Protein folding and modification

23

18

26

3

7

77

02.03 Proteolysis

20

13

21

2

4

60

02.04 Storage protein

2

3

6

10

0

21

02.05 Protein transport

23

8

5

0

3

39

03 Cell growth/division

75

11

13

1

13

113

03.01 Cell growth and DNA related

60

10

10

0

8

88

03.02 Cell wall related

15

1

3

1

5

25

04 ROS homeostasis

14

12

15

2

15

58

05 Defense/stress response

14

7

35

41

8

105

06 Signal transduction

16

9

13

1

7

46

07 Transporters

50

5

17

1

15

88

08 Transcription

18

3

23

1

10

55

09 Photosynthesis

1

1

0

0

6

8

10 PPDK

0

2

0

0

0

2

11 14-3-3 protein

3

0

0

0

0

3

12 Unclassified

67

35

49

12

36

199

  1. The clusters (c0 to c4) were created by Gene Cluster 3.0; raw data for the clusters are listed in Additional file 4