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Table 4 Numbers of Mxa transport proteins according to TC class and subclass

From: Comparative genomics of transport proteins in developmental bacteria: Myxococcus xanthus and Streptomyces coelicolor

TC classa Class description No. of proteins TC subclass Subclass description No. of proteins
1 Channel/Pore 21 1.A α-type channel 18
    1.B β-type porin 3
2 Secondary carrier 153 2.A Porter (uniporter, symporter, antiporter) 153
3 Primary active transporter 146 3.A P-P-bond hydrolysis-driven transporter 124
    3.B Decarboxylation-driven transporter 4
    3.D Oxidoreduction-driven transporter 18
4 Group translocator 7 4.A Phosphotransfer-driven group translocator 2
    4.C Acyl CoA ligase-coupled transporter 5
5 Transmembrane electron carrier 10 5.A Transmembrane 2-electron transfer carrier 10
8 Auxiliary transport proteinb 8 8.A Auxiliary transport protein 8
9 Poorly defined system 10 9.A Recognized transporter of unknown biochemical mechanism 10
Total   355    355
  1. Detailed class and subclass descriptions can be found at
  2. a Transporter classes 6 and 7 have not been assigned in the TC system yet and therefore are not listed here.
  3. b Auxiliary proteins facilitate transport via established transport systems and therefore are not counted as a separate system.