| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| P0AFA2 | Nitrate/nitrite sensor protein NarX; EC 2.7.13.3; | narX; narR; b1222 JW1213; | NP_415740.1;YP_489492.1; | 598 | escherichia-coli |
| P19318 | Respiratory nitrate reductase 2 beta chain; EC 1.7.99.4; | narY; b1467 JW1462; | NP_415984.1;YP_489732.1; | 514 | escherichia-coli |
| P19319 | Respiratory nitrate reductase 2 alpha chain; EC 1.7.99.4; | narZ; b1468 JW1463; | NP_415985.1;YP_489733.1; | 1246 | escherichia-coli |
| P39411 | Non-canonical purine NTP phosphatase; EC 3.6.1.-; Inosine triphosphatase; ITPase; Non-standard purine NTP phosphatase; Nucleoside-triphosphate phosphatase; NTPase; Xanthosine triphosphatase; XTPase; | yjjX; b4394 JW5801; | NP_418811.2;YP_492524.1; | 170 | escherichia-coli |
| P0A763 | Nucleoside diphosphate kinase; NDK; NDP kinase; EC 2.7.4.6; Nucleoside-2-P kinase; | ndk; b2518 JW2502; | NP_417013.1;YP_490746.1; | 143 | escherichia-coli |
| P33920 | Nucleoid-associated protein YejK; | yejK; b2186 JW2174; | NP_416691.1;YP_490426.1; | 335 | escherichia-coli |
| P77258 | N-ethylmaleimide reductase; EC 1.-.-.-; N-ethylmaleimide reducing enzyme; | nemA; ydhN; b1650 JW1642; | NP_416167.1;YP_489914.1; | 365 | escherichia-coli |
| P67430 | HTH-type transcriptional repressor NemR; | nemR; ydhM; b1649 JW5874; | NP_416166.3;YP_489913.1; | 199 | escherichia-coli |
| P0ADL1 | Purine ribonucleoside efflux pump NepI; | nepI; yicM; b3662 JW5938; | NP_418118.2;YP_491772.1; | 396 | escherichia-coli |
| P68739 | Endonuclease V; EndoV; EC 3.1.21.7; Deoxyinosine 3'endonuclease; Deoxyribonuclease V; DNase V; | nfi; yjaF; b3998 JW5547; | NP_418426.2;YP_491462.1; | 223 | escherichia-coli |
| P31600 | Bacteriophage N4 adsorption protein A; | nfrA; b0568 JW0557; | NP_415100.1;YP_488855.1; | 990 | escherichia-coli |
| P0AFA5 | Bacteriophage N4 adsorption protein B; | nfrB; b0569 JW0558; | NP_415101.1;YP_488856.1; | 745 | escherichia-coli |
| P38489 | Oxygen-insensitive NAD(P)H nitroreductase; EC 1.-.-.-; Dihydropteridine reductase; EC 1.5.1.34; FMN-dependent nitroreductase; | nfsB; dprA nfnB nfsI ntr; b0578 JW0567; | NP_415110.1;YP_488865.1; | 217 | escherichia-coli |
| P17117 | Oxygen-insensitive NADPH nitroreductase; EC 1.-.-.-; Modulator of drug activity A; | nfsA; mda18 mdaA ybjB; b0851 JW0835; | NP_415372.1;YP_489124.1; | 240 | escherichia-coli |
| P63020 | Fe/S biogenesis protein NfuA; | nfuA; gntY yhgI; b3414 JW3377; | NP_417873.1;YP_492018.1; | 191 | escherichia-coli |
| P13738 | Na(+)/H(+) antiporter NhaA; Sodium/proton antiporter NhaA; | nhaA; ant; b0019 JW0018; | NP_414560.1;YP_488325.1; | 388 | escherichia-coli |
| P0AFA7 | Na(+)/H(+) antiporter NhaB; Sodium/proton antiporter NhaB; | nhaB; b1186 JW1175; | NP_415704.1;YP_489453.1; | 513 | escherichia-coli |
| P76007 | K(+)/H(+) antiporter NhaP2; Potassium/proton antiporter NhaP2; | cvrA; nhaP2 ycgO; b1191 JW5184; | NP_415709.2;YP_489458.1; | 578 | escherichia-coli |
| P0A9G2 | Transcriptional activator protein NhaR; Na(+)/H(+) antiporter regulatory protein; | nhaR; antO; b0020 JW0019; | NP_414561.1;YP_488326.1; | 301 | escherichia-coli |
| P77567 | N-hydroxyarylamine O-acetyltransferase; EC 2.3.1.118; Arylamine N-acetyltransferase; Arylhydroxamate N,O-acetyltransferase; NAT102; | nhoA; yddI; b1463 JW1458; | NP_415980.1;YP_489728.1; | 281 | escherichia-coli |
