| Orth | Species | Gene | Name | Description | Fitness | %Id | Cov |
| | Klebsiella michiganensis M5al | BWI76_RS18890 | | nif-specific transcriptional activator NifA | sig. | 100 | 100 |
| o | Dickeya dadantii 3937 | DDA3937_RS18805 | | nif-specific transcriptional activator NifA | insig. | 78 | 100 |
| o | Dickeya dianthicola 67-19 | HGI48_RS18785 | | nif-specific transcriptional activator NifA | insig. | 77 | 100 |
| o | Dickeya dianthicola ME23 | DZA65_RS19920 | | nif-specific transcriptional activator NifA | insig. | 77 | 100 |
| o | Rahnella sp. WP5 | EX31_RS15395 | | nif-specific transcriptional activator NifA | insig. | 69 | 98 |
| o | Rhodopseudomonas palustris CGA009 | TX73_007055 | | sigma-54-dependent Fis family transcriptional regulator | sig. | 43 | 95 |
| o | Xanthobacter sp. DMC5 | GFF4584 | | Nif-specific regulatory protein | insig. | 41 | 96 |
| o | Herbaspirillum seropedicae SmR1 | HSERO_RS14390 | | ATPase AAA | strong | 42 | 97 |
| o | Magnetospirillum magneticum AMB-1 | AMB_RS17530 | | nif-specific transcriptional activator NifA | insig. | 41 | 96 |
| | Rhodopseudomonas palustris CGA009 | TX73_024055 | | nif-specific transcriptional activator NifA | strong | 41 | 96 |
| o | Paraburkholderia sabiae LMG 24235 | QEN71_RS42175 | | nif-specific transcriptional activator NifA | insig. | 41 | 97 |
| o | Desulfovibrio vulgaris Hildenborough JW710 | DVUA0143 | nifA-2 | nif-specific regulatory protein (TIGR) | strong | 43 | 95 |
| o | Rhodospirillum rubrum S1H | Rru_A1388 | | Transcriptional Regulator, NifA subfamily, Fis Family (NCBI) | cofit | 41 | 94 |
| | Rhodospirillum rubrum S1H | Rru_A0993 | | Transcriptional Regulator, NifA, Fis Family (NCBI) | strong | 44 | 86 |
| o | Methylophilus sp. DMC18 | GFF149 | | Nif-specific regulatory protein | insig. | 40 | 95 |
| o | Azospirillum brasilense Sp245 | AZOBR_RS29300 | | Fis family transcriptional regulator | insig. | 40 | 95 |
| o | Dechlorosoma suillum PS | Dsui_0940 | | Nif-specific regulatory protein | strong | 43 | 83 |
| | Rhodopseudomonas palustris CGA009 | TX73_007390 | | sigma-54-dependent Fis family transcriptional regulator | insig. | 40 | 94 |
| o | Desulfovibrio vulgaris Miyazaki F | DvMF_0608 | | transcriptional regulator, NifA subfamily, Fis Family (RefSeq) | strong | 41 | 92 |
| | Azospirillum sp. SherDot2 | MPMX19_01840 | | Nif-specific regulatory protein | insig. | 43 | 82 |
| | Desulfovibrio vulgaris Hildenborough JW710 | DVU1949 | nifA-1 | nif-specific regulatory protein (TIGR) | strong | 41 | 91 |
| o | Sinorhizobium meliloti 1021 | SMa0815 | | Fis family transcriptional regulator | insig. | 38 | 95 |
| | Klebsiella pneumoniae MKP103 | KDGMDA_10090 | | sigma-54-dependent response regulator transcription factor ZraR | insig. | 50 | 60 |
| o | Hydrogenophaga sp. GW460-11-11-14-LB1 | GFF1930 | | Transcriptional regulatory protein zraR | insig. | 41 | 81 |
| | Klebsiella michiganensis M5al | BWI76_RS01605 | | transcriptional regulatory protein ZraR | insig. | 48 | 61 |
| | Desulfovibrio vulgaris Miyazaki F | DvMF_2528 | | transcriptional regulator, NifA subfamily, Fis Family (RefSeq) | strong | 42 | 83 |
| | Azospirillum brasilense Sp245 | AZOBR_RS21185 | | Fis family transcriptional regulator | insig. | 48 | 60 |
| | Desulfovibrio vulgaris Hildenborough JW710 | DVU2894 | flrA | sigma-54 dependent transcriptional regulator (TIGR) | strong | 58 | 45 |
| | Desulfovibrio vulgaris Miyazaki F | DvMF_2200 | | two component, sigma54 specific, transcriptional regulator, Fis family (RefSeq) | no data | 48 | 60 |
| | Herbaspirillum seropedicae SmR1 | HSERO_RS12530 | | transcriptional regulator | insig. | 50 | 57 |
| | Desulfovibrio vulgaris Hildenborough JW710 | DVU3220 | atoC | sigma-54 dependent transcriptional regulator/response regulator (TIGR) | no data | 47 | 60 |
| | Azospirillum sp. SherDot2 | MPMX19_03461 | | Regulatory protein AtoC | insig. | 48 | 60 |
| | Pseudomonas fluorescens FW300-N2E3 | AO353_16225 | | Fis family transcriptional regulator | insig. | 45 | 60 |
| | Desulfovibrio vulgaris Hildenborough JW710 | DVU0744 | | sigma-54 dependent transcriptional regulator/response regulator (TIGR) | strong | 49 | 61 |
| | Pseudomonas simiae WCS417 | PS417_05525 | | Fis family transcriptional regulator | strong | 46 | 60 |
| | Dickeya dianthicola 67-19 | HGI48_RS07265 | | formate hydrogenlyase transcriptional activator FlhA | insig. | 48 | 60 |
| | Rhodopseudomonas palustris CGA009 | TX73_010880 | | sigma 54-interacting transcriptional regulator | insig. | 47 | 60 |
| | Pseudomonas putida KT2440 | PP_4371 | | two component system AtoC DNA-binding transcriptional activator | strong | 47 | 59 |
| | Pseudomonas fluorescens SBW25 | PFLU_RS05610 | | sigma-54-dependent Fis family transcriptional regulator | strong | 46 | 60 |
| | Pseudomonas fluorescens SBW25-INTG | PFLU_RS05610 | | sigma-54-dependent Fis family transcriptional regulator | strong | 46 | 60 |
| | Pseudomonas lactucae CFBP13502 | GEMAOFIL_01292 | | Regulatory protein AtoC | cofit | 46 | 60 |
| | Dickeya dianthicola ME23 | DZA65_RS07775 | | formate hydrogenlyase transcriptional activator FlhA | insig. | 48 | 60 |
| | Xanthomonas campestris pv. campestris strain 8004 | Xcc-8004.2800.1 | | Flagellar regulatory protein FleQ | sig. | 57 | 45 |
| | Desulfovibrio vulgaris Miyazaki F | DvMF_1324 | | sigma54 specific transcriptional regulator, Fis family (RefSeq) | strong | 56 | 45 |
| | Rahnella sp. WP5 | EX31_RS19870 | | formate hydrogenlyase transcriptional activator FlhA | insig. | 47 | 59 |
| | Salmonella enterica subsp. enterica serovar Typhimurium str. MS1868 | GFF4188 | | Response regulator of zinc sigma-54-dependent two-component system | insig. | 48 | 60 |
| | Cellulophaga baltica 18 | M666_RS12540 | | sigma 54-interacting response regulator | insig. | 47 | 55 |
| | Desulfovibrio vulgaris Miyazaki F | DvMF_0823 | | two component, sigma54 specific, transcriptional regulator, Fis family (RefSeq) | insig. | 47 | 60 |
| | Serratia liquefaciens MT49 | IAI46_12570 | | formate hydrogenlyase transcriptional activator FlhA | insig. | 50 | 57 |
| | Pseudomonas sp. BP01 | JOY50_RS00695 | | sigma-54 dependent transcriptional regulator | insig. | 48 | 59 |
| | Desulfovibrio vulgaris Hildenborough JW710 | DVU2359 | | sigma-54 dependent transcriptional regulator (TIGR) | insig. | 47 | 59 |
| | Desulfovibrio vulgaris Hildenborough JW710 | DVU1063 | flrC | transcriptional regulatory protein (TIGR) | strong | 44 | 64 |
| | Dickeya dadantii 3937 | DDA3937_RS07400 | | formate hydrogenlyase transcriptional activator FlhA | insig. | 47 | 60 |
| | Escherichia fergusonii Becca | EFB2_01635 | | Regulatory protein AtoC | insig. | 47 | 58 |
| | Escherichia coli ECOR38 | HEPCGN_22430 | atoC | acetoacetate metabolism transcriptional regulator AtoC | insig. | 47 | 58 |
| | Escherichia coli Nissle 1917 | ECOLIN_RS12965 | | acetoacetate metabolism transcriptional regulator AtoC | no data | 47 | 58 |
| | Escherichia coli ECOR38 | HEPCGN_21015 | hyfR | DNA-binding transcriptional activator HyfR | insig. | 47 | 60 |
| | Escherichia coli ECRC62 | BNILDI_12310 | hyfR | DNA-binding transcriptional regulator HyfR | insig. | 47 | 60 |
| | Escherichia coli BL21 | ECD_03881 | | fused DNA-binding response regulator in two-component regulatory system with ZraS: response regulator/sigma54 interaction protein | insig. | 48 | 63 |
| | Escherichia coli HS(pFamp)R (ATCC 700891) | OHPLBJKB_04045 | | Transcriptional regulatory protein ZraR | insig. | 48 | 63 |
| | Escherichia coli Nissle 1917 | ECOLIN_RS23090 | | sigma-54-dependent response regulator transcription factor ZraR | insig. | 47 | 60 |
| | Escherichia coli BL21 | ECD_02383 | | hydrogenase-4 transcriptional activator | cofit | 47 | 60 |
| | Escherichia fergusonii Becca | EFB2_04606 | | Transcriptional regulatory protein ZraR | insig. | 48 | 60 |
| | Rhodospirillum rubrum S1H | Rru_A1385 | | Two Component, Sigma54 Specific, Transcriptional Regulator, Fis family (NCBI) | cofit | 47 | 60 |
| | Escherichia coli BW25113 | b2491 | hyfR | putative 2-component regulator, interaction with sigma 54 (VIMSS) | sig. | 47 | 60 |
| | Xanthobacter sp. DMC5 | GFF4834 | | Regulatory protein AtoC | insig. | 46 | 61 |
| | Escherichia coli BL21 | ECD_02147 | | fused response regulator of ato operon, in two-component system with AtoS: response regulator/sigma54 interaction protein | insig. | 47 | 58 |
| | Escherichia coli HS(pFamp)R (ATCC 700891) | OHPLBJKB_01490 | | Regulatory protein AtoC | insig. | 47 | 58 |
| | Escherichia coli BW25113 | b2220 | atoC | fused response regulator of ato operon, in two-component system with AtoS: response regulator/sigma54 interaction protein (NCBI) | insig. | 47 | 58 |
| | Escherichia coli ECRC100 | OKFHMN_21850 | hyfR | DNA-binding transcriptional regulator HyfR | insig. | 47 | 60 |
| | Escherichia coli ECRC101 | MCAODC_12380 | hyfR | DNA-binding transcriptional regulator HyfR | insig. | 47 | 60 |
| | Escherichia coli ECRC102 | NIAGMN_19620 | hyfR | DNA-binding transcriptional regulator HyfR | insig. | 47 | 60 |
| | Escherichia coli ECRC98 | JDDGAC_25795 | hyfR | DNA-binding transcriptional regulator HyfR | insig. | 47 | 60 |
| | Escherichia coli ECRC99 | KEDOAH_06370 | hyfR | DNA-binding transcriptional regulator HyfR | no data | 47 | 60 |
| | Escherichia coli ECRC101 | MCAODC_03820 | zraR | sigma-54-dependent response regulator transcription factor ZraR | insig. | 48 | 60 |
| | Escherichia coli ECRC102 | NIAGMN_11070 | zraR | sigma-54-dependent response regulator transcription factor ZraR | insig. | 48 | 60 |
| | Escherichia coli ECRC99 | KEDOAH_14840 | zraR | sigma-54-dependent response regulator transcription factor ZraR | no data | 48 | 60 |
| | Marinobacter adhaerens HP15 | HP15_328 | | two component, sigma54 specific, transcriptional regulator, Fis family | strong | 49 | 54 |
| | Escherichia coli HS(pFamp)R (ATCC 700891) | OHPLBJKB_01235 | | DNA-binding transcriptional activator HyfR | cofit | 47 | 60 |
| | Escherichia coli ECRC62 | BNILDI_06055 | zraR | sigma-54-dependent response regulator transcription factor ZraR | insig. | 48 | 63 |
| | Desulfovibrio vulgaris Hildenborough JW710 | DVUA0057 | atoC | sigma-54 dependent transcriptional regulator/response regulator (TIGR) | insig. | 47 | 57 |
| | Escherichia coli BW25113 | b4004 | zraR | fused DNA-binding response regulator in two-component regulatory system with ZraS: response regulator/sigma54 interaction protein (NCBI) | insig. | 48 | 63 |
| | Pseudomonas sp. DMC3 | GFF2762 | | Phenol regulator MopR | cofit | 46 | 58 |
| | Escherichia coli ECOR38 | HEPCGN_11960 | zraR | sigma-54-dependent response regulator transcription factor ZraR | insig. | 46 | 60 |
| | Marinobacter adhaerens HP15 | HP15_4023 | | helix-turn-helix, Fis-type | insig. | 46 | 58 |
| | Escherichia coli ECOR27 | NOLOHH_05465 | zraR | sigma-54-dependent response regulator transcription factor ZraR | insig. | 48 | 63 |
| | Escherichia coli BL21 | ECD_02559 | | anaerobic nitric oxide reductase DNA-binding transcriptional activator | cofit | 53 | 49 |
| | Escherichia coli BW25113 | b2709 | ygaA | putative 2-component transcriptional regulator (VIMSS) | insig. | 53 | 49 |
| | Rhodanobacter denitrificans FW104-10B01 | LRK54_RS13485 | | sigma-54-dependent Fis family transcriptional regulator | strong | 56 | 45 |
| | Lysobacter sp. OAE881 | ABIE51_RS16770 | | sigma-54 dependent transcriptional regulator | cofit | 53 | 48 |
| | Herbaspirillum seropedicae SmR1 | HSERO_RS23170 | | ATPase AAA | insig. | 50 | 58 |
| | Bosea sp. OAE506 | ABIE41_RS06250 | | sigma 54-interacting transcriptional regulator | insig. | 58 | 45 |
| | Enterobacter sp. TBS_079 | MPMX20_03593 | | Anaerobic nitric oxide reductase transcription regulator NorR | insig. | 48 | 56 |
| | Escherichia coli ECRC100 | OKFHMN_13320 | zraR | sigma-54-dependent response regulator transcription factor ZraR | cofit | 47 | 60 |
| | Escherichia coli ECRC98 | JDDGAC_16945 | zraR | sigma-54-dependent response regulator transcription factor ZraR | insig. | 47 | 60 |
| | Salmonella enterica subsp. enterica serovar Typhimurium str. MS1868 | GFF4703 | | Anaerobic nitric oxide reductase transcription regulator NorR | insig. | 55 | 46 |
| | Escherichia coli ECRC100 | OKFHMN_20650 | norR | nitric oxide reductase transcriptional regulator NorR | insig. | 53 | 49 |
| | Escherichia coli ECRC101 | MCAODC_11175 | norR | nitric oxide reductase transcriptional regulator NorR | insig. | 53 | 49 |
| | Escherichia coli ECRC102 | NIAGMN_18420 | norR | nitric oxide reductase transcriptional regulator NorR | insig. | 53 | 49 |
| | Escherichia coli ECRC98 | JDDGAC_24315 | norR | nitric oxide reductase transcriptional regulator NorR | insig. | 53 | 49 |