| Role | Gene | Name | |
|---|
| 2H phosphoesterase superfamily protein Bsu1186 (yjcG) | No genes | | |
| 5-aminolevulinate synthase (EC 2.3.1.37) | No genes | | |
| Acyl-coenzyme A synthetases/AMP-(fatty) acid ligases, YtcI homolog | No genes | | |
| Coproporphyrinogen III oxidase, aerobic (EC 1.3.3.3) | Synpcc7942_0674 | hemF | |
| Coproporphyrinogen III oxidase, oxygen-independent (EC 1.3.99.22) | No genes | | |
| Coproporphyrinogen III oxidase, oxygen-independent (EC 1.3.99.22), divergent, putative | No genes | | |
| Coproporphyrinogen III oxidase, oxygen-independent (EC 1.3.99.22), divergent, putative 2 | No genes | | |
| Cytochrome c-type biogenesis protein CcdA (DsbD analog) | Synpcc7942_0323 | ccdA | |
| Cytochrome c-type biogenesis protein CcsA/ResC | Synpcc7942_0511 | ccsA | |
| DUF1801 domain-containing protein | No genes | | |
| Ferrochelatase, protoheme ferro-lyase (EC 4.99.1.1) | Synpcc7942_0137 | hemH | |
| GNAT family acetyltransferase YjcF | No genes | | |
| Glutamate-1-semialdehyde aminotransferase (EC 5.4.3.8) | Synpcc7942_0645 | hemL | |
| Glutamyl-tRNA reductase (EC 1.2.1.70) | Synpcc7942_0504 | hemA | |
| HemX protein, negative effector of steady-state concentration of glutamyl-tRNA reductase | No genes | | |
| Homolog of E. coli HemY protein | No genes | | |
| Hypothetical membrane protein, possible involvement in cytochrome functioning/assembly | No genes | | |
| Hypothetical protein Q, similar to Chlorite dismutase | No genes | | |
| Hypothetical protein SAV1831 | No genes | | |
| Hypothetical protein SAV1869 | No genes | | |
| Hypothetical protein, ydbS homolog | No genes | | |
| Hypothetical protein, ydbT homolog | No genes | | |
| Hypothetical, related to broad specificity phosphatases COG0406 | No genes | | |
| Methyltransferase (EC 2.1.1.-) colocalized with Q | No genes | | |
| Periplasmic/membrane protein associated with DUF414 | No genes | | |
| Porphobilinogen deaminase (EC 2.5.1.61) | Synpcc7942_0967 | hemC | |
| Porphobilinogen synthase (EC 4.2.1.24) | Synpcc7942_1792 | hemB | |
| Possibly related to ydbT | No genes | | |
| Precorrin-2 oxidase (EC 1.3.1.76) | No genes | | |
| Protein of unknown function DUF414 | No genes | | |
| Protoporphyrinogen IX oxidase, aerobic (EC 1.3.3.4) | No genes | | |
| Protoporphyrinogen IX oxidase, oxygen-independent, HemG (EC 1.3.-.-) | No genes | | |
| Putative acetyl esterase YjcH (EC 3.1.1.-) | No genes | | |
| Putative lipoprotein SAV1865 | No genes | | |
| Putative membrane protein Q2 colocalized with Q | No genes | | |
| Putative nitroreductase family protein SACOL0874 | No genes | | |
| Putative oxidoreductase ferredoxin-type protein, clusters with CPO | No genes | | |
| Ribonuclease D (EC 3.1.26.3) | No genes | | |
| Sirohydrochlorin cobaltochelatase (EC 4.99.1.3) | Synpcc7942_2611 | | |
| Sirohydrochlorin ferrochelatase (EC 4.99.1.4) | No genes | | |
| Small hypothetical protein Hyp1 | No genes | | |
| Sua5 YciO YrdC YwlC family protein | No genes | | |
| Uncharacterized SAV1743 homolog | No genes | | |
| Uncharacterized protein Q1 colocalized with Q | No genes | | |
| Uncharacterized protein UPF0344 | No genes | | |
| Uncharacterized protein, homolog of B.subtilis yhgC | No genes | | |
| Uroporphyrinogen III decarboxylase (EC 4.1.1.37) | Synpcc7942_1086 | hemE | |
| Uroporphyrinogen-III methyltransferase (EC 2.1.1.107) | Synpcc7942_0271 | cobA | |
| | Synpcc7942_2610 | cobA | |
| Uroporphyrinogen-III synthase (EC 4.2.1.75) | Synpcc7942_0272 | hemD | |
| Uroporphyrinogen-III synthase, divergent, Flavobacterial type (EC 4.2.1.75) | No genes | | |
| Uroporphyrinogen-III synthase, divergent, Francisella type (EC 4.2.1.75) | No genes | | |
| transmembrane protein, distant homology with ydbS | No genes | | |
| transmembrane protein, distant homology with ydbT | No genes | | |