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Table 2 Counts of Sco transport proteins according to substrate type

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

Substrate No. of proteins of indicated type acting on substrate type
  Channels/Pores Primary Carriers Secondary Carriers Group translocators Transmembrane electron flow carriers Auxiliary proteins (Putative) Poorly characterized Total no. of systems
I. Inorganic Molecules         
A. Nonselective 5   1      6
B. Cations 9 33 32     15 89
C. Anions   6 15      21
D. Electrons   29 2   9    40
II. Carbon sources         
A. Sugars & polyols 2 83 9 2     96
B. Monocarboxylates   11 15      26
C. Di- & tricarboxylates    7      7
D. Organoanions (noncarboxylic)   2 6      8
E. Aromatic Compounds    8      8
III. Amino acids & their derivatives         
A. Amino acids & conjugates 1 16 39      56
B. Amines, amides, polyamines, & organocations 1 5 7 2     15
C. Peptides   20 1      21
IV. Vitamins, cofactors & cofactor precursors         
A. Vitamins & vitamin or cofactor precursors   5 3 1     9
B. Enzyme & redox cofactors         0
C. Siderophores; siderophore-Fe complexes   21 8      29
V. Drugs, dyes, sterols & toxins         
A. Multiple drugs   20 36      56
B. Specific drugs   4 58      62
C. Pigments   7 1      8
D. Other hydrophobic substances   6       6
VI. Macromolecules         
A. Carbohydrates 1 16     1   18
B. Proteins 1 10     3 3 17
C. Lipids   14 7 1     22
VII. Nucleic acids         
A. Nucleic acids   10 8 1    2 21
VIII. Unknown         
A. Unknown   3 14      17
Total 20 321 277 7 9 4 20 658
  1. Substrate categories include: (I) inorganic molecules; (II) carbon sources; (III) amino acids & their derivatives; (IV) vitamins, cofactors & cofactor precursors; (V) drugs, dyes, sterols & toxins; (VI) macromolecules; (VII) nucleic acids; and (VIII) unknown.