| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| P39370 | Probable 9-O-acetyl-N-acetylneuraminic acid deacetylase; Neu5,9Ac2 deacetylase; EC 3.1.1.-; Probable 9-O-acetyl-N-acetylneuraminate esterase; Probable sialyl esterase NanS; | nanS; yjhS; b4309 JW4272; | NP_418729.1;YP_492443.1; | 326 | escherichia-coli |
| P41036 | Putative sialic acid transporter; Sialic acid permease; | nanT; b3224 JW3193; | NP_417691.4;YP_491408.1; | 496 | escherichia-coli |
| P33937 | Periplasmic nitrate reductase; EC 1.7.99.4; | napA; yojC yojD yojE; b2206 JW2194; | NP_416710.1;YP_490444.1; | 828 | escherichia-coli |
| P0ABL3 | Periplasmic nitrate reductase, electron transfer subunit; Diheme cytochrome c NapB; | napB; yejY; b2203 JW5367; | NP_416707.4;YP_490441.1; | 149 | escherichia-coli |
| P0ABL5 | Cytochrome c-type protein NapC; | napC; yejX; b2202 JW2190; | NP_416706.1;YP_490440.1; | 200 | escherichia-coli |
| P0A9I5 | Protein NapD; | napD; yojF; b2207 JW2195; | NP_416711.1;YP_490445.1; | 87 | escherichia-coli |
| P0AAL0 | Ferredoxin-type protein NapF; | napF; yojG; b2208 JW2196; | NP_416712.1;YP_490446.1; | 164 | escherichia-coli |
| P0AAL3 | Ferredoxin-type protein NapG; | napG; yojA yojB; b2205 JW2193; | NP_416709.1;YP_490443.1; | 231 | escherichia-coli |
| P33934 | Ferredoxin-type protein NapH; | napH; yejZ; b2204 JW2192; | NP_416708.1;YP_490442.1; | 287 | escherichia-coli |
| P09152 | Respiratory nitrate reductase 1 alpha chain; EC 1.7.99.4; Nitrate reductase A subunit alpha; Quinol-nitrate oxidoreductase subunit alpha; | narG; bisD narC; b1224 JW1215; | NP_415742.1;YP_489494.1; | 1247 | escherichia-coli |
| P11349 | Respiratory nitrate reductase 1 beta chain; EC 1.7.99.4; Nitrate reductase A subunit beta; Quinol-nitrate oxidoreductase subunit beta; | narH; b1225 JW1216; | NP_415743.1;YP_489495.1; | 512 | escherichia-coli |
| P11350 | Respiratory nitrate reductase 1 gamma chain; EC 1.7.99.4; Cytochrome B-NR; Nitrate reductase A subunit gamma; Quinol-nitrate oxidoreductase subunit gamma; | narI; chlI; b1227 JW1218; | NP_415745.1;YP_489497.1; | 225 | escherichia-coli |
| P0AF26 | Nitrate reductase molybdenum cofactor assembly chaperone NarJ; Redox enzyme maturation protein NarJ; | narJ; b1226 JW1217; | NP_415744.1;YP_489496.1; | 236 | escherichia-coli |
| P0AF28 | Nitrate/nitrite response regulator protein NarL; | narL; frdR; b1221 JW1212; | NP_415739.1;YP_489491.1; | 216 | escherichia-coli |
| P10903 | Nitrate/nitrite transporter NarK; Nitrite extrusion protein 1; Nitrite facilitator 1; | narK; b1223 JW1214; | NP_415741.1;YP_489493.1; | 463 | escherichia-coli |
| P31802 | Nitrate/nitrite response regulator protein NarP; | narP; b2193 JW2181; | NP_416697.1;YP_490431.1; | 215 | escherichia-coli |
| P37758 | Nitrate/nitrite transporter NarU; Nitrite extrusion protein 2; Nitrite facilitator 2; | narU; yddF; b1469 JW1464; | NP_415986.1;YP_489734.1; | 462 | escherichia-coli |
| P27896 | Nitrate/nitrite sensor protein NarQ; EC 2.7.13.3; | narQ; b2469 JW2453; | NP_416964.1;YP_490696.1; | 566 | escherichia-coli |
| P19317 | Probable nitrate reductase molybdenum cofactor assembly chaperone NarW; Redox enzyme maturation protein NarW; | narW; b1466 JW1461; | NP_415983.1;YP_489731.1; | 231 | escherichia-coli |
| P0AF32 | Respiratory nitrate reductase 2 gamma chain; EC 1.7.99.4; | narV; b1465 JW1460; | NP_415982.1;YP_489730.1; | 226 | escherichia-coli |
