| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| P0AAM7 | Hydrogenase-2 operon protein HybG; | hybG; b2990 JW2958; | NP_417464.1;YP_491187.1; | 82 | escherichia-coli |
| P0AAK1 | Formate hydrogenlyase subunit 2; FHL subunit 2; Hydrogenase-3 component B; | hycB; hevB; b2724 JW2694; | NP_417204.1;YP_490933.1; | 203 | escherichia-coli |
| P16429 | Formate hydrogenlyase subunit 3; FHL subunit 3; Hydrogenase-3 component C; | hycC; hevC; b2723 JW2693; | NP_417203.1;YP_490932.1; | 608 | escherichia-coli |
| P16431 | Formate hydrogenlyase subunit 5; FHL subunit 5; Hydrogenase-3 component E; | hycE; hevE; b2721 JW2691; | NP_417201.1;YP_490930.1; | 569 | escherichia-coli |
| P16432 | Formate hydrogenlyase subunit 6; FHL subunit 6; Hydrogenase-3 component F; | hycF; hevF; b2720 JW2690; | NP_417200.1;YP_490929.1; | 180 | escherichia-coli |
| P0AEV9 | Hydrogenase 3 maturation protease; EC 3.4.23.51; HycI protease; | hycI; b2717 JW2687; | NP_417197.1;YP_490926.1; | 156 | escherichia-coli |
| P0AEV7 | Formate hydrogenlyase maturation protein HycH; | hycH; hevH; b2718 JW2688; | NP_417198.1;YP_490927.1; | 136 | escherichia-coli |
| P16433 | Formate hydrogenlyase subunit 7; FHL subunit 7; Hydrogenase-3 component G; | hycG; hevG; b2719 JW2689; | NP_417199.1;YP_490928.1; | 255 | escherichia-coli |
| P16430 | Formate hydrogenlyase subunit 4; FHL subunit 4; Hydrogenase 3 component D; | hycD; hevD; b2722 JW2692; | NP_417202.1;YP_490931.1; | 307 | escherichia-coli |
| P0AAK4 | Electron transport protein HydN; | hydN; b2713 JW2683; | NP_417193.1;YP_490922.1; | 175 | escherichia-coli |
| P23481 | Hydrogenase-4 component A; EC 1.-.-.-; | hyfA; yffE; b2481 JW2466; | NP_416976.4;YP_490709.1; | 205 | escherichia-coli |
| P77416 | Hydrogenase-4 component D; EC 1.-.-.-; | hyfD; b2484 JW2469; | NP_416979.1;YP_490712.1; | 479 | escherichia-coli |
| P0AEW1 | Hydrogenase-4 component E; EC 1.-.-.-; | hyfE; b2485 JW2470; | NP_416980.1;YP_490713.1; | 216 | escherichia-coli |
| P77437 | Hydrogenase-4 component F; EC 1.-.-.-; | hyfF; b2486 JW2471; | NP_416981.1;YP_490714.1; | 526 | escherichia-coli |
| P77423 | Hydrogenase-4 component H; | hyfH; b2488 JW2473; | NP_416983.1;YP_490716.1; | 181 | escherichia-coli |
| P77453 | Hydrogenase-4 component J; EC 1.-.-.-; | hyfJ; b2490 JW2475; | NP_416985.4;YP_490718.1; | 137 | escherichia-coli |
| P71229 | Hydrogenase-4 transcriptional activator; | hyfR; b2491 JW2476; | NP_416986.4;YP_490719.1; | 670 | escherichia-coli |
| P77329 | Hydrogenase-4 component G; EC 1.-.-.-; | hyfG; b2487 JW2472; | NP_416982.1;YP_490715.1; | 555 | escherichia-coli |
| P23482 | Hydrogenase-4 component B; EC 1.-.-.-; | hyfB; yffF; b2482 JW2467; | NP_416977.1;YP_490710.1; | 672 | escherichia-coli |
| P77668 | Hydrogenase-4 component I; EC 1.-.-.-; | hyfI; b2489 JW5805; | NP_416984.1;YP_490717.1; | 252 | escherichia-coli |
