Table 2 Comparison of COG categories among the three sulfur-reducing crenarchaeotes.

Amino acid transport and metabolism

74

75

89

Carbohydrate transport and metabolism

72

40

108

Cell cycle control, cell division, chromosome partitioning

8

7

13

Cell motility

4

6

5

Cell wall/membrane/envelope biogenesis

23

24

47

Chromatin structure and dynamics

2

1

2

Coenzyme transport and metabolism

53

75

51

Cytoskeleton

0

0

1

Defense mechanisms

17

10

22

Energy production and conversion

92

109

119

Extracellular structures

0

0

0

Function unknown

116

113

132

General function prediction only

199

206

212

Inorganic ion transport and metabolism

85

57

82

Intracellular trafficking, secretion, and vesicular transport

12

15

15

Lipid transport and metabolism

15

20

20

Nuclear structure

0

0

0

Nucleotide transport and metabolism

39

43

42

Posttranslational modification, protein turnover, chaperones

53

56

63

RNA processing and modification

2

2

1

Replication, recombination and repair

71

61

78

Secondary metabolites biosynthesis, transport, and catabolism

5

9

3

Signal transduction mechanisms

18

24

15

Transcription

60

66

73

Translation

164

161

153