Table 5 Counts of Mxa transport proteins according to substrate type

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