Table 1 Numbers of Sco transport proteins according to TC class and subclass

1

Channel/Pore

20

1.A

α-type channel

19

1.B

β-type porin

0

1.C

Pore-forming toxin

1

2

Secondary carrier

277

2.A

Porter (uniporter, symporter, antiporter)

277

3

Primary active transporter

321

3.A

P-P-bond hydrolysis-driven transporter

286

3.B

Decarboxylation-driven transporter

4

3.D

Oxidoreduction-driven transporter

28

3.E

Light absorption-driven transporter

3

4

Group translocator

7

4.A

Phosphotransfer-driven group translocator

5

4.B

Nicotinamide ribonucleoside uptake transporter

1

4.C

Acyl CoA ligase-coupled transporter

1

5

Transmembrane electron carrier

9

5.A

Transmembrane 2-electron transfer carrier

8

5.B

Transmembrane 1-electron transfer carrier

1

8

Auxiliary transport protein^b

4

8.A

Auxiliary transport protein

4

9

Poorly defined system

20

9.A

Recognized transporter of unknown biochemical mechanism

20

Total

658