| Strain | Pseudomonas syringae pv. syringae B728a |
| GI | 66046403 |
| Locus Tag | Psyr_3174 |
| Description | uroporphyrin-III C-methyltransferase, C-terminal:siroheme synthase, N-terminal |
| Strain | Pseudomonas denitrificans ATCC 13867 |
| GI | 472325889 |
| Locus Tag | H681_13625 |
| Description | siroheme synthase |
| Strain | Hahella chejuensis KCTC 2396 |
| GI | 83645247 |
| Locus Tag | HCH_02450 |
| Description | uroporphyrinogen-III methylase |