TABLE 1.
High-affinity l-amino acid importers of E. coli K-12a
| Amino acid | Importer category |
|
|---|---|---|
| ABC-type | Ion-driven | |
| Alanine | ✓ | |
| Arginine | ✓ | ✓ |
| Asparagine | ✓ | |
| Aspartic acid | ✓ | ✓ |
| Cystine | ✓ | ✓ |
| Glycine | ✓ | |
| Glutamine | ✓ | |
| Glutamic acid | ✓ | ✓ |
| Histidine | ✓ | |
| Isoleucine | ✓ | ✓ |
| Leucine | ✓ | ✓ |
| Lysine | ✓ | ✓ |
| Methionine | ✓ | |
| Phenylalanine | ✓ | ✓ |
| Proline | ✓ | |
| Serine | ✓ | |
| Threonine | ✓ | |
| Tryptophan | ✓ | |
| Tyrosine | ✓ | |
| Valine | ✓ | ✓ |
| Cysteineb | ||
a
Importers are categorized as ATP-binding cassette (ABC) transporters and ion-driven transporters. Data are collected from EcoCyc. The importers are identified by name in Table S1 in the supplemental material.
b
Uniquely, cysteine is not known to have a dedicated high-affinity importer.