| F pilus assembly protein | traU KPN_pKPN3p06020 | A6TIH6 | 1 |
| F1 capsule antigen | caf1 YPMT1.84 Y1100 YP_pMT082 | P26948 | 1 |
| F1 capsule-anchoring protein | caf1A YPMT1.83 Y1099 YP_pMT083 | P26949 | 1 |
| F1C minor fimbrial subunit protein G (FocG) (FocG protein) (Minor F1652 fimbrial subunit G) | F1652G focG | Q46685 | 1 |
| F5/8 type C domain protein | MXAN_4914 | Q1D2Q3 | 1 |
| FabB | fabB HPSD74_2052 | U4S8C4 | 1 |
| Factor H-binding protein | SC1083_1753 | G4AA80 | 1 |
| FAD dependent oxidoreductase | B195_18371 | M5QE24 | 1 |
| FAD-binding family protein | FTT_1328c | W0TYL4 | 1 |
| FAD-binding monooxygenase | B195_21235 | M5QCJ7 | 1 |
| FAD:protein FMN transferase (EC 2.7.1.180) (Flavin transferase) | SC1083_2114 | G4AB79 | 1 |
| FAD:protein FMN transferase (EC 2.7.1.180) (Flavin transferase) | HPSD74_0050 | U4SP93 | 1 |
| FAD:protein FMN transferase (EC 2.7.1.180) (Flavin transferase) | SPy_1138 | Q99ZP8 | 1 |
| FadL protein | SC1083_0429 | G4A6I9 | 1 |
| Farnesyl diphosphate synthase (EC 2.5.1.10) | ispA spr1087 | Q8DPN0 | 1 |
| Farnesyl diphosphate synthase (FPP synthase) (EC 2.5.1.10) ((2E,6E)-farnesyl diphosphate synthase) (Geranyltranstransferase) | ispA yqiD BSU24280 | P54383 | 1 |
| Fatty acid desaturase (EC 1.14.19.-) | FTT_0148 | Q5NIC8 | 1 |
| Fatty acid desaturase family protein (EC 1.14.19.1) | KW89_1301 | A0A0K2DWQ3 | 1 |
| Fatty acid oxidation complex subunit alpha [Includes: 3-hydroxyacyl-CoA dehydrogenase (EC 1.1.1.35); Enoyl-CoA hydratase/Delta(3)-cis-Delta(2)-trans-enoyl-CoA isomerase/3-hydroxybutyryl-CoA epimerase (EC 4.2.1.17) (EC 5.1.2.3) (EC 5.3.3.8)] | fadB VSAK1_12702 | A6D7Z8 | 1 |
| Fatty acid oxidation complex subunit alpha [Includes: Enoyl-CoA hydratase/3-hydroxybutyryl-CoA epimerase (EC 4.2.1.17) (EC 5.1.2.3); 3-hydroxyacyl-CoA dehydrogenase (EC 1.1.1.35)] | fadJ KPN78578_26790 KPN_02723 | A6TC19 | 1 |
| Fatty acid oxidation complex subunit alpha [Includes: Enoyl-CoA hydratase/Delta(3)-cis-Delta(2)-trans-enoyl-CoA isomerase/3-hydroxybutyryl-CoA epimerase (EC 4.2.1.17) (EC 5.1.2.3) (EC 5.3.3.8); 3-hydroxyacyl-CoA dehydrogenase (EC 1.1.1.35)] | fadB YPO3766 y0464 YP_3282 | Q8ZAN0 | 1 |
| FbaA protein | fbaA KPR_4618 | R4YF09 | 1 |
| FbaB protein | fbaB KPR_1550 | R4YDN3 | 1 |
| FdoG protein | fdoG KPR_0153 | R4Y3Y9 | 1 |
| Fe(3+) ions import ATP-binding protein FbpC (EC 3.6.3.30) | fbpC SC1083_0175 | G4A5U0 | 1 |
| Fe-regulated protein B | frpB | Q51162 | 1 |
| Fe/S biogenesis protein NfuA | nfuA PA1847 | Q9I2P8 | 1 |
| FecA-like outer membrane receptor | PP_0867 | Q88PI3 | 1 |
| FemAB family protein | CPC_2341 | B1BIC6 | 1 |
| Fermentation/respiration switch protein (Fragment) | frsA VSAK1_02079 | A6D9N5 | 1 |
| Ferredoxin YfhL (EcFd) | yfhL b2562 JW2546 | P52102 | 1 |
| Ferredoxin, putative | SAOUHSC_01504 | Q2FYE8 | 1 |
| Ferredoxin--NADP reductase (FNR) (Fd-NADP(+) reductase) (EC 1.18.1.2) | SPy_0850 M5005_Spy0657 | Q9A0B5 | 1 |
| Ferredoxin-type protein NapH (Ubiquinol--[NapC cytochrome c] reductase NapH subunit) | napH yejZ b2204 JW2192 | P33934 | 1 |
| Ferric aerobactin receptor | VS_2116 | B7VH91 | 1 |
| Ferric aerobactin receptor precusor IutA (Ligand-gated channel protein) | iutA A4X18_13460 AXE68_18115 SY51_16795 | Q6KD44 | 1 |
| Ferric enterobactin receptor | pfeA AB237_2510 | A0A0E1PVM4 | 1 |
| Ferric enterobactin receptor | pfeA PA2688 | Q05098 | 1 |
| Ferric enterobactin transport system permease protein FepD | fepD b0590 JW0582 | P23876 | 1 |
| Ferric enterobactin uptake receptor | cfrA Cj0755 | Q0PAD4 | 1 |
| Ferric transport regulator protein | spf SPy_0187 | Q9A1M6 | 1 |
| Ferric uptake regulation protein | fur Fphi_0928 | B0TWP3 | 1 |
| Ferric uptake regulation protein | fur Pnuc_0229 | A4SVD6 | 1 |
| Ferric uptake regulation protein | fur VSAK1_13846 | A6D484 | 1 |
| Ferric uptake regulation protein | fur FTT_0030c | Q5NIN6 | 1 |
| Ferric-mycobactin receptor, FemA | femA PA1910 | Q9I2J4 | 1 |
| Ferrichrome porin FhuA (Outer membrane protein receptor for ferrichrome, colicin M, and phages T1, T5, and phi80) | fhuA S0145 SF0142 AJR25_013835 | Q83ME0 | 1 |
| Ferrichrome-iron receptor | VS_II0677 | B7VRS9 | 1 |
| Ferrioxamine B receptor | foxA STM0364 | P0CL48 | 1 |
| Ferritin (EC 1.16.3.2) | Fphi_1562 | B0TZD5 | 1 |
| Ferritin (EC 1.16.3.2) | ftnA FTN_1031 | A0Q6Q3 | 1 |
| Ferritin (EC 1.16.3.2) | PGN_0604 | B2RIC8 | 1 |
| Ferritin (EC 1.16.3.2) | ftn PG_1286 | F5HE54 | 1 |
| Ferritin (EC 1.16.3.2) | SC1083_0842 | G4A7P6 | 1 |
| Ferritin (EC 1.16.3.2) | OOM_1349 | I2B009 | 1 |
| Ferritin BfrB (EC 1.16.3.1) (Non-heme ferritin Ftn) (Nox19) | bfrB ftn Rv3841 | P9WNE5 | 1 |
| Ferrochelatase (EC 4.99.1.1) (Heme synthase) (Protoheme ferro-lyase) | hemH VSAK1_08561 | A6D095 | 1 |
| Ferrochelatase (EC 4.99.1.1) (Heme synthase) (Protoheme ferro-lyase) | hemH OOM_1735 | I2B0Z3 | 1 |
| Ferrochelatase (EC 4.99.1.1) (Heme synthase) (Protoheme ferro-lyase) | hemH FTT_1138 | Q5NFT3 | 1 |
| Ferrodoxin, 4Fe-4S | MXAN_3051 | Q1D7W4 | 1 |
| Ferrous iron transport protein B | feoB FTN_0066 | A0Q412 | 1 |
| Ferrous iron transport protein B | feoB AC3_2137 | B1BWU7 | 1 |
| Ferrous iron transport protein B | feoB CPC_1128 | B1BJE3 | 1 |
| Ferrous iron transport protein B | OOM_0684 | I2AYD8 | 1 |
| Ferrous iron transport protein B | feoB FTT_0249 | Q5NI41 | 1 |
| FeS cluster assembly protein SufB | sufB BSU32670 | O32162 | 1 |
| FeS cluster assembly protein SufB | sufB ynhE b1683 JW5273 | P77522 | 1 |
| FeS cluster assembly protein SufD | sufD yurX BSU32700 | O32165 | 1 |
| FetA | NMH_0179 | E6MVH3 | 1 |
| FG-GAP repeat protein | MXAN_5182 | Q1D1Y8 | 1 |
| FG-GAP repeat protein | FSU_2120 | D9SBX6 | 1 |
| FHA domain-containing protein FhaA | fhaA TB39.8 Rv0020c | P71590 | 1 |
| FHA/GAF domain protein | MXAN_6571 | Q1CY30 | 1 |
| FhuE receptor (Outer-membrane receptor for Fe(III)-coprogen, Fe(III)-ferrioxamine B and Fe(III)-rhodotrulic acid) | fhuE b1102 JW1088 | P16869 | 1 |
| Fibro-slime domain protein | FSU_2502 | A7UG66 | 1 |
| Fibrobacter succinogenes major paralogous domain protein | FSU_2794 | C9RKA2 | 1 |
| Fibronectin type III domain protein | FSU_3194 | D9S8I1 | 1 |
| Fimbrial chaperone protein | YPO0699 | Q7CGJ5 | 1 |
| Fimbrial protein | etfD | Q7DFZ5 | 1 |
| Fimbrial protein | pilA PP_0634 | Q88Q62 | 1 |
| Fimbrial protein (Pilin) | pilE NMB0018 | P05431 | 1 |
| Fimbrial usher protein | F911_01625 HMPREF0010_00251 | D0C671 | 1 |
| FimV | fimV | O87015 | 1 |
| FimV domain protein | KW89_1921 | A0A0K2DXZ1 | 1 |
| FimX | fimX PA4959 | Q9HUK6 | 1 |
| FixG-related protein | VSAK1_24445 | A6D3Y6 | 1 |
| FKBP-type peptidyl-prolyl cis-trans isomerase domain protein/thiol-disulfide oxidoreductase domain protein | FSU_0167 | C9RP18 | 1 |
| FKBP-type peptidyl-prolyl cis-trans isomerase SlyD (PPIase) (EC 5.2.1.8) (Histidine-rich protein) (Metallochaperone SlyD) (Rotamase) (Sensitivity to lysis protein D) (WHP) | slyD b3349 JW3311 | P0A9K9 | 1 |
| Flagellar assembly factor FliW | fliW Cj1075 | Q0P9H9 | 1 |
| Flagellar assembly protein FliH | fliH KW89_2677 | A0A0K2E0N5 | 1 |
| Flagellar basal body rod protein FlgB | HP_1559 | O26081 | 1 |
| Flagellar basal body rod protein FlgB | flgB Cj0528c | Q0PAY8 | 1 |
| Flagellar basal body-associated protein FliL | SAMEA3374989_00056 SAMEA3375059_03309 | A0A1R2F0A3 | 1 |
| Flagellar basal-body rod protein FlgG (Distal rod protein) | flgG B195_08422 | M5QIV7 | 1 |
| Flagellar basal-body rod protein FlgG (Distal rod protein) | flgG Smlt2312 | B2FQV3 | 1 |
| Flagellar basal-body rod protein FlgG (Distal rod protein) | flgG Cj0698 | Q0PAI1 | 1 |
| Flagellar biosynthesis hook-filament junction protein | flgL SCH_1131 | Q57QH4 | 1 |
| Flagellar biosynthesis hook-filament junction protein (Flagellar hook-filament junction protein 3 FlgL) | flgL ECs1461 Z1721 | Q8X8K3 | 1 |
| Flagellar biosynthesis protein FlhA | flhA KW89_1426 | A0A0K2DX27 | 1 |
| Flagellar biosynthesis protein FlhF (Flagella-associated GTP-binding protein) | flhF Cj0064c | O52908 | 1 |