| Strain | Pseudomonas syringae pv. syringae B728a |
| GI | 66047237 |
| Locus Tag | Psyr_4010 |
| Description | citrate-proton symport |
| Strain | Pseudomonas putida W619 |
| GI | 170720204 |
| Locus Tag | PputW619_1018 |
| Description | major facilitator superfamily metabolite/H(+) symporter |
| Strain | Azotobacter vinelandii CA6 |
| GI | 482900241 |
| Locus Tag | AvCA6_18040 |
| Description | dicarboxylate or citrate transporter (MFS superfamily) |