Table 16.

Classification of transport systems functioning by an unknown mechanism (class 9.A) according to substrate specificity

SubstrateTC no.FamilyOrganismal group
I.A. Nonselective
 Nonselective9.A.14NPCE
I.C. Inorganic cations
 Cation (nonselective)9.A.17MITB, A, E
 Cation (nonselective)9.A.20LCTPl
 Cu2+(in)9.A.11Ctr1Y
 Cu2+(in)9.A.12Ctr2An, Pl, Pr, Y
 Fe2+(in)9.A.8FeoBB, A
 Fe2+(in)9.A.9FeTY
 Fe2+(in)9.A.10OFeTY
 Hg2+(out)9.A.2MerTPB
 Hg2+(out)9.A.3MerCB
 Mg2+(in)9.A.19MgtEB, A
II.B. Monocarboxylates
 Fatty acids (short chain)9.A.13scFATB
III.B. Amides and amines
 Amides (in)9.A.15.1.1–2AmiB
 Urea (in)9.A.15.1.3AmiB
III.C. Peptides
 Peptides (in)9.A.18PUPB
IV.A. Bases
 Uric acid (out)9.A.17UATAn
IV.B. Nucleoside
 Nucleosides (general)9.A.6INTAn
IV.C. Nucleotides
 Nicotinamide mononucleotide (in)9.A.4PnuCG− B
V. Vitamins
 Nicotinamide mononucleotide (in)9.A.4PnuCG− B
VII.A. Complex carbohydrates
 Capsular polysaccharides (out)9.A.1.2.2PSTG+ B
 Exopolysaccharides (out)9.A.1.2.1PSTG− B
 Lipopolysaccharides (out)9.A.1.1.1PSTG− B
VII.B. Proteins
 Proteins9.A.5Oxa1E (mito), B, A
 Proteins9.A.14NPCE
 Microcins (uptake)9.A.18.1.2PUPG− B
VII.C. Nucleic acids
 DNA9.A.16.1.1–2SDTG+ B
 RNA9.A.14NPCE