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Table 5 Counts of Mxa 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 3        3
B. Cations 6 36 38   1   3 84
C. Anions   6 10   2    18
D. Electrons   4    3    7
II. Carbon sources         
A. Sugars & polyols   4 2 2     8
B. Monocarboxylates         0
C. Di- & tricarboxylates    1      1
D. Organoanions (noncarboxylic)    2      2
E. Aromatic Compounds   4       4
III. Amino acids & their derivatives         
A. Amino acids & conjugates   6 14      20
B. Amines, amides, polyamines, & organocations 1        1
C. Peptides   12 9     1 22
IV. Vitamins, cofactors & cofactor precursors         
A. Vitamins & vitamin or cofactor precursors   5 2      7
B. Enzyme & redox cofactors   1       1
C. Siderophores; siderophore-Fe complexes   2 1      3
D. Nucleosides/nucleotides 1 2 1      4
V. Drugs, dyes, sterols & toxins         
A. Multiple drugs   1 32    1   34
B. Specific drugs   11 2      13
C. Pigments         
D. Other hydrophobic substances    5      5
E. Toxins 6 4 1      11
F. Virulence factors        2 2
VI. Macromolecules         
A. Carbohydrates 1 2 9    3   15
B. Proteins 2 19 1    4   26
C. Lipids   9 3 5     17
VII. Nucleic acids         
A. Nucleic acids   1       1
VIII. Water         
A. Water 1        1
IX. Unknown         
A. Unknown   17 20   4   4 45
Total 21 146 153 7 10 8 10 355
  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.