Table 1 Transporters in L. hongkongensis and C. violaceum

No. of CDSs

% of total CDSs

% of transport CDSs

No. of CDSs

% of total CDSs

% of transport CDSs

Channel and Pores

48

1.5

10.5

63

1.4

11.3

   α-type channels

17

26

   β-barrel porins

29

43

   Pore-forming toxins (proteins and peptides)

0

3

   Holins

2

2

Electrochemical Potential-driven Transporters

134

4.1

29.3

161

3.7

28.8

   Porters (uniporters, symporters and antiporters)

132

159

   Ion-gradient-driven energizers

2

2

Primary Active Transporters

194

6.0

42.5

252

5.7

45.0

   P-P-bond-hydrolysis-driven transporters

150

206

   Decarboxylation-driven transporters

5

7

   Oxidoreduction-driven transporters

39

39

Group Translocators

9

0.3

2.0

18

0.4

3.2

   Phosphotransfer-driven group translocators

2

8

   Acyl CoA ligase-coupled transporters

7

10

Transmembrane Electron Carriers

16

0.5

3.5

13

0.3

2.3

   Transmembrane 2-electron transfer carriers

14

12

   Transmembrane 1-electron transfer carriers

2

1

Accessory Factors Involved in Transport

7

0.2

1.5

20

0.5

3.6

   Auxiliary transport proteins

7

20

Incompletely Characterized Transport Systems

49

1.5

10.7

33

0.7

5.9

   Recognized transporters of unknown biochemical mechanism

15

14

   Putative transport proteins

34

19