| Uncharacterized RNA methyltransferase SPy_1346/M5005_Spy1098 (EC 2.1.1.-) | SPy_1346 M5005_Spy1098 | Q99Z86 | 1 |
| Uncharacterized RNA methyltransferase SPy_1606/M5005_Spy1319 (EC 2.1.1.-) | SPy_1606 M5005_Spy1319 | Q99YP3 | 1 |
| Uncharacterized sugar kinase YgcE (EC 2.7.1.-) | ygcE b2776 JW5444 | P55138 | 1 |
| Uncharacterized transporter YeaV | yeaV b1801 JW5293 | P0ABD1 | 1 |
| Undecaprenyl phosphate-alpha-4-amino-4-deoxy-L-arabinose arabinosyl transferase (EC 2.4.2.43) (4-amino-4-deoxy-L-arabinose lipid A transferase) (Lipid IV(A) 4-amino-4-deoxy-L-arabinosyltransferase) (Undecaprenyl phosphate-alpha-L-Ara4N transferase) | arnT PA3556 | Q9HY61 | 1 |
| Undecaprenyl-diphosphatase (EC 3.6.1.27) (Bacitracin resistance protein) (Undecaprenyl pyrophosphate phosphatase) | uppP AC3_1581 | B1BRE4 | 1 |
| Undecaprenyl-diphosphatase (EC 3.6.1.27) (Bacitracin resistance protein) (Undecaprenyl pyrophosphate phosphatase) | uppP SAOUHSC_00691 | Q2G0B4 | 1 |
| Undecaprenyl-diphosphatase (EC 3.6.1.27) (Bacitracin resistance protein) (Undecaprenyl pyrophosphate phosphatase) | uppP KU39_1853 | A0A0K2L4E8 | 1 |
| Undecaprenyl-phosphate 4-deoxy-4-formamido-L-arabinose transferase (EC 2.4.2.53) (Undecaprenyl-phosphate Ara4FN transferase) (Ara4FN transferase) | arnC PA3553 | Q9HY64 | 1 |
| Universal stress protein | Fphi_0748 | B0TW61 | 1 |
| Universal stress protein | ABAYE1500 | B0V766 | 1 |
| Universal stress protein | SC1083_2128 | G4AB93 | 1 |
| Universal stress protein | usp FTT_0245 | Q5NI44 | 1 |
| Universal stress protein A | uspA YPO3970 y3859 YP_3333 | Q8ZA49 | 1 |
| Universal stress protein A | uspA b3495 JW3462 | P0AED0 | 1 |
| Universal stress protein E | uspE ydaA b1333 JW1327 | P0AAC0 | 1 |
| Universal stress protein F | uspF ynaF yzzL b1376 JW1370 | P37903 | 1 |
| Universal stress protein family | PP_2187 | Q88KV2 | 1 |
| Universal stress protein family protein | B195_07455 | M5R211 | 1 |
| Universal stress protein Rv1636 (USP Rv1636) | Rv1636 TB15.3 | P9WFC9 | 1 |
| Universal stress protein UP12 (Universal stress protein G) | uspG ybdQ yzzU b0607 JW0600 | P39177 | 1 |
| UPF0057 membrane protein YqaE | yqaE b2666 JW2641 | P0AE42 | 1 |
| UPF0061 protein YdiU | ydiU SSON_1453 | Q3Z253 | 1 |
| UPF0098 protein Rv2140c | Rv2140c MTCY270.28 | P9WFN1 | 1 |
| UPF0145 protein CD630_17110 | CD630_17110 | Q186R7 | 1 |
| UPF0145 protein CPF_0876 | CPF_0876 | Q0TSR5 | 1 |
| UPF0145 protein ERS852446_02892 | ERS852446_02892 pBeta2_00061 pCpb2-CP1_58 | G5DSB0 | 1 |
| UPF0145 protein FTT_0954c | FTT_0954c | Q5NG98 | 1 |
| UPF0145 protein VSAK1_23709 | VSAK1_23709 | A6CWE8 | 1 |
| UPF0153 protein YeiW | yeiW b4502 JW5361 | P0AFT8 | 1 |
| UPF0154 protein SAOUHSC_01338 | SAOUHSC_01338 | Q2FYT7 | 1 |
| UPF0154 protein SPy_0359/M5005_Spy0302 | SPy_0359 M5005_Spy0302 | P67295 | 1 |
| UPF0173 metal-dependent hydrolase MXAN_1394 | MXAN_1394 | Q1DCH2 | 1 |
| UPF0174 protein jhp_1494 | jhp_1494 | Q9ZJ24 | 1 |
| UPF0176 protein PA0858 | PA0858 | Q9I583 | 1 |
| UPF0176 protein SPy_0915/M5005_Spy0717 | SPy_0915 M5005_Spy0717 | P67332 | 1 |
| UPF0210 protein NMB1652 | NMB1652 | Q9JYC3 | 1 |
| UPF0214 protein YfeW | yfeW SSON_2519 | Q3YZB3 | 1 |
| UPF0234 protein B195_07215 | B195_07215 | M5QMJ8 | 1 |
| UPF0234 protein YajQ | yajQ SF0363 S0371 | P59561 | 1 |
| UPF0234 protein YajQ | yajQ SSON_0403 | Q3Z4Y3 | 1 |
| UPF0246 protein PA3539 | PA3539 | Q9HY72 | 1 |
| UPF0246 protein SPJ_1454 | SPJ_1454 | C1CFD1 | 1 |
| UPF0246 protein SPy_2104/M5005_Spy1788 | SPy_2104 M5005_Spy1788 | Q99XQ1 | 1 |
| UPF0259 membrane protein YciC | yciC b1255 JW1247 | P21365 | 1 |
| UPF0260 protein YcgN | ycgN b1181 JW5180 | P0A8L5 | 1 |
| UPF0261 protein YPO3839/y0391/YP_3209 | YPO3839 y0391 YP_3209 | Q8ZAG3 | 1 |
| UPF0297 protein SPy_2114/M5005_Spy1797 | SPy_2114 M5005_Spy1797 | P68886 | 1 |
| UPF0298 protein SPy_0397/M5005_Spy0329 | SPy_0397 M5005_Spy0329 | P60419 | 1 |
| UPF0304 protein YfbU | yfbU SSON_2351 | Q3YZR7 | 1 |
| UPF0306 protein YhbP | yhbP SSON_3300 | Q3YX87 | 1 |
| UPF0316 protein LMRG_02495 | LMRG_02495 | A0A0H3GHY3 | 1 |
| UPF0316 protein SAOUHSC_02131 | SAOUHSC_02131 | Q2G2R9 | 1 |
| UPF0319 protein HPSD74_0087 | HPSD74_0087 | U4SQ28 | 1 |
| UPF0319 protein VC_A0026 | VC_A0026 | Q9KND9 | 1 |
| UPF0324 membrane protein spr0034 | spr0034 | Q8DRN6 | 1 |
| UPF0325 protein YaeH | yaeH SCH_0211 | Q57T44 | 1 |
| UPF0337 protein PA4738 | PA4738 | Q9HV61 | 1 |
| UPF0337 protein YjbJ | yjbJ b4045 JW4005 | P68206 | 1 |
| UPF0339 protein PA0329 | PA0329 | Q9I6G2 | 1 |
| UPF0340 protein SPy_1898/M5005_Spy1614 | SPy_1898 M5005_Spy1614 | Q99Y31 | 1 |
| UPF0342 protein SPy_0811/M5005_Spy0626 | SPy_0811 M5005_Spy0626 | Q9A0E3 | 1 |
| UPF0348 protein SPP_1759 | SPP_1759 | C1CM77 | 1 |
| UPF0348 protein spr1587 | spr1587 | Q8DNR1 | 1 |
| UPF0348 protein SPy_0314/M5005_Spy0267 | SPy_0314 M5005_Spy0267 | Q9A1E8 | 1 |
| UPF0356 protein SPy_1875/M5005_Spy1594 | SPy_1875 M5005_Spy1594 | Q99Y43 | 1 |
| UPF0365 protein SAOUHSC_01676 | SAOUHSC_01676 | Q2FXZ9 | 1 |
| UPF0365 protein YqfA | yqfA BSU25380 | P54466 | 1 |
| UPF0371 protein SPy_1343/M5005_Spy1095 | SPy_1343 M5005_Spy1095 | Q99Z89 | 1 |
| UPF0374 protein lmo1687 | lmo1687 | Q8Y6J7 | 1 |
| UPF0374 protein SPy_1608/M5005_Spy1321 | SPy_1608 M5005_Spy1321 | Q99YP1 | 1 |
| UPF0381 protein YfcZ | yfcZ b2343 JW2340 | P0AD33 | 1 |
| UPF0398 protein SPy_1647/M5005_Spy1353 | SPy_1647 M5005_Spy1353 | Q99YL3 | 1 |
| UPF0438 protein YifE | yifE STM3898 STMD1.96 | Q7CPD8 | 1 |
| UPF0478 protein SAOUHSC_01855 | SAOUHSC_01855 | Q2G247 | 1 |
| UPF0482 protein YnfB | ynfB SFV_1561 | Q0T4M6 | 1 |
| UPF0502 protein VSAK1_14987 | VSAK1_14987 | A6D3A9 | 1 |
| UPF0637 protein SAOUHSC_01054 | SAOUHSC_01054 | Q2G2G7 | 1 |
| UPF0748 lipoprotein YddW | yddW b1491 JW1486 | P64426 | 1 |
| UPF0757 protein YmgG | ymgG b1172 JW5178 | Q7DFV3 | 1 |
| Uptake of enterochelin tonB-dependent uptake of B colicins | exbB SSON_3149 | Q3YXM9 | 1 |
| Uracil permease (Uracil transporter) | uraA b2497 JW2482 | P0AGM7 | 1 |
| Uracil phosphoribosyltransferase (EC 2.4.2.9) (UMP pyrophosphorylase) (UPRTase) | upp B195_04866 | M5QKR5 | 1 |
| Uracil phosphoribosyltransferase (EC 2.4.2.9) (UMP pyrophosphorylase) (UPRTase) | upp CPR_2172 | Q0SQY5 | 1 |
| Uracil phosphoribosyltransferase (EC 2.4.2.9) (UMP pyrophosphorylase) (UPRTase) | upp SC1083_1722 | G4AA49 | 1 |
| Uracil phosphoribosyltransferase (EC 2.4.2.9) (UMP pyrophosphorylase) (UPRTase) | upp SSON_2580 | Q3YZ54 | 1 |
| Uracil phosphoribosyltransferase (EC 2.4.2.9) (UMP pyrophosphorylase) (UPRTase) | upp HPSD74_1121 | U4SH65 | 1 |
| Uracil phosphoribosyltransferase (EC 2.4.2.9) (UMP pyrophosphorylase) (UPRTase) | upp SPy_0392 M5005_Spy0327 | P67400 | 1 |
| Uracil phosphoribosyltransferase (EC 2.4.2.9) (UMP pyrophosphorylase) (UPRTase) | upp CD630_34790 | Q180X8 | 1 |
| Uracil phosphoribosyltransferase (EC 2.4.2.9) (UMP pyrophosphorylase) (UPRTase) | upp SAOUHSC_02353 | Q2FWE6 | 1 |
| Uracil-DNA glycosylase (UDG) (EC 3.2.2.27) | ung PA0750 | Q9I5H9 | 1 |
| Uracil-DNA glycosylase (UDG) (EC 3.2.2.27) | ung SPy_0905 M5005_Spy0708 | Q9A072 | 1 |
| Urease accessory protein UreE | ureE YPO2668 y1240 YP_2469 | Q9ZFR8 | 1 |
| Urease subunit alpha (EC 3.5.1.5) (Urea amidohydrolase subunit alpha) | ureC B195_15747 | M5QES1 | 1 |
| Urease subunit alpha (EC 3.5.1.5) (Urea amidohydrolase subunit alpha) | ureC YPO2667 y1239 YP_2468 | Q9ZFR9 | 1 |
| Urease subunit alpha (EC 3.5.1.5) (Urea amidohydrolase subunit alpha) | ureC Rv1850 MTCY359.23c | P9WFF1 | 1 |
| Urease subunit beta (EC 3.5.1.5) (Urea amidohydrolase subunit beta) | ureB B195_15742 | M5QSY7 | 1 |
| Urease subunit beta (EC 3.5.1.5) (Urea amidohydrolase subunit beta) | ureB yeuB YPO2666 y1238 YP_2467 | P69990 | 1 |
| Urease subunit gamma (EC 3.5.1.5) (Urea amidohydrolase subunit gamma) | ureA B195_15737 | M5QH03 | 1 |
| Urease subunit gamma (EC 3.5.1.5) (Urea amidohydrolase subunit gamma) | ureA yeuA YPO2665 y1237 YP_2466 | P69994 | 1 |