| Putative uncharacterized protein YjiV | yjiV mcrD b4486 | P39393 | 1 |
| Putative universal stress protein | ynaF SCH_1646 | Q57P09 | 1 |
| Putative universal stress protein A (UspA) | CD630_08120 | Q18A09 | 1 |
| Putative universal stress protein SAOUHSC_01819 | SAOUHSC_01819 | Q2FXL6 | 1 |
| Putative UPF0313 protein YPO0674/y3502/YP_2990 | YPO0674 y3502/y3503 YP_2990 | Q8CZS4 | 1 |
| Putative uracil permease | AC3_1964 | B1BWJ3 | 1 |
| Putative uracil permease | pyrP SPy_0831 | Q9A0C9 | 1 |
| Putative Uroporphyrin-III C-methyltransferase | PP_0188 | Q88RE3 | 1 |
| Putative uroporphyrin-III C-methyltransferase | VSAK1_12265 | A6D6U4 | 1 |
| Putative uroporphyrin-III C-methyltransferase HemX | NMB0778 | Q9K044 | 1 |
| Putative usher protein | PP_2362 | Q88KC8 | 1 |
| Putative vacuolating cytotoxin (VacA) paralog | jhp_0556 | Q9ZLM3 | 1 |
| Putative virulence-related membrane protein | pagC | Q4ACD6 | 1 |
| Putative Xaa-His dipeptidase | SPy_1542 | Q99YT8 | 1 |
| Putative XAA-PRO dipeptidase X-PRO dipeptidase (EC 3.4.13.9) | pepQ SPy_0513 | Q9A119 | 1 |
| Putative xanthine dehydrogenase iron-sulfur-binding subunit XdhC | xdhC ygeU b2868 JW2836 | Q46801 | 1 |
| Putative xanthine dehydrogenase, XdhA subunit | VSAK1_25090 | A6CZ74 | 1 |
| Putative xylanase | FSU_2265 | C9RS22 | 1 |
| Putative YadA-like protein | HPSD74_0544 | U4SM03 | 1 |
| Putative zinc metalloprotease SPy_1963/M5005_Spy1674 (EC 3.4.24.-) | SPy_1963 M5005_Spy1674 | Q99XY3 | 1 |
| Putative Zn-dependent proteases with possible chaperone function | yggG STM3077 | Q7CPU3 | 1 |
| Putatve dicarboxylate transporter | CPC_1238 | B1BEG5 | 1 |
| Putrescine export system permease protein SapB | sapB b1293 JW1286 | P0AGH3 | 1 |
| Putrescine transport system permease protein PotH | potH b0856 JW0840 | P31135 | 1 |
| Putrescine-binding periplasmic protein | potD-3 NMB1594 | Q9JYG7 | 1 |
| Putrescine-binding periplasmic protein | B195_15077 | M5QTJ2 | 1 |
| Putrescine-binding periplasmic protein | potF STM0877 | Q8ZQK0 | 1 |
| Putrescine-binding periplasmic protein | potF-II PP_3147 | Q88I54 | 1 |
| Putrescine-binding periplasmic protein | potD2 NTHI0626 | Q4QN48 | 1 |
| Putrescine-binding periplasmic protein | SC1083_1418 | G4A9A8 | 1 |
| Putrescine-binding periplasmic protein | HPSD74_2033 | U4SAY1 | 1 |
| Putrescine-binding periplasmic protein | potF FTT_0481 | Q5NHH3 | 1 |
| PvdL | pvdL PA2424 | Q9I157 | 1 |
| Pyoverdine synthetase D | pvdD PA2399 | Q9I182 | 1 |
| Pyoverdine synthetase F | pvdF PA2396 | Q9I184 | 1 |
| Pyridine nucleotide-disulphide oxidoreductase | MXAN_3962 | Q1D5D1 | 1 |
| Pyridoxal 5'-phosphate synthase subunit PdxS (PLP synthase subunit PdxS) (EC 4.3.3.6) (Pdx1) | pdxS Fphi_0240 | B0TZ17 | 1 |
| Pyridoxal 5'-phosphate synthase subunit PdxS (PLP synthase subunit PdxS) (EC 4.3.3.6) (Pdx1) | pdxS FTN_0601 | A0Q5I1 | 1 |
| Pyridoxal 5'-phosphate synthase subunit PdxS (PLP synthase subunit PdxS) (EC 4.3.3.6) (Pdx1) | pdxS spr1322 | Q8DP71 | 1 |
| Pyridoxal 5'-phosphate synthase subunit PdxS (PLP synthase subunit PdxS) (EC 4.3.3.6) (Pdx1) | pdxS Rv2606c MTCY1A10.27 | P9WII9 | 1 |
| Pyridoxal 5'-phosphate synthase subunit PdxS (PLP synthase subunit PdxS) (EC 4.3.3.6) (Pdx1) | pdxS OOM_1178 | I2AZK9 | 1 |
| Pyridoxal 5'-phosphate synthase subunit PdxS (PLP synthase subunit PdxS) (EC 4.3.3.6) (Pdx1) | pdxS SAOUHSC_00499 | Q2G0Q1 | 1 |
| Pyridoxal 5'-phosphate synthase subunit PdxS (PLP synthase subunit PdxS) (EC 4.3.3.6) (Pdx1) | pdxS FTT_0511 | Q5NHE6 | 1 |
| Pyridoxal 5'-phosphate synthase subunit PdxT (EC 4.3.3.6) (Pdx2) (Pyridoxal 5'-phosphate synthase glutaminase subunit) (EC 3.5.1.2) | pdxT FTN_0602 | A0Q5I2 | 1 |
| Pyridoxal 5'-phosphate synthase subunit PdxT (EC 4.3.3.6) (Pdx2) (Pyridoxal 5'-phosphate synthase glutaminase subunit) (EC 3.5.1.2) | pdxT lmo2102 | Q8Y5G1 | 1 |
| Pyridoxal 5'-phosphate synthase subunit PdxT (EC 4.3.3.6) (Pdx2) (Pyridoxal 5'-phosphate synthase glutaminase subunit) (EC 3.5.1.2) | pdxT FTT_0512 | Q5NHE5 | 1 |
| Pyridoxal kinase (EC 2.7.1.35) | pdxK SPy_1209 | Q99ZJ3 | 1 |
| Pyridoxine 5'-phosphate synthase (PNP synthase) (EC 2.6.99.2) | pdxJ B195_05580 | M5QLL7 | 1 |
| Pyridoxine 5'-phosphate synthase (PNP synthase) (EC 2.6.99.2) | pdxJ HP_1582 | O26102 | 1 |
| Pyridoxine 5'-phosphate synthase (PNP synthase) (EC 2.6.99.2) | pdxJ SSON_2688 | Q3YYV2 | 1 |
| Pyridoxine 5'-phosphate synthase (PNP synthase) (EC 2.6.99.2) | pdxJ VSAK1_07979 | A6D8G6 | 1 |
| Pyridoxine/pyridoxamine 5'-phosphate oxidase (EC 1.4.3.5) (PNP/PMP oxidase) (PNPOx) (Pyridoxal 5'-phosphate synthase) | pdxH PA1049 | Q9I4S5 | 1 |
| Pyrimidine-nucleoside phosphorylase (PYNP) (Py-NPase) (EC 2.4.2.2) | pdp pyn MW2060 | Q8NVF6 | 1 |
| Pyrimidine-nucleoside phosphorylase (PYNP) (Py-NPase) (EC 2.4.2.2) | pdp pyn SAOUHSC_02377 | Q2FWC1 | 1 |
| Pyrimidine-specific ribonucleoside hydrolase RihA (EC 3.2.-.-) (Cytidine/uridine-specific hydrolase) | rihA SSON_0605 | Q3Z4E1 | 1 |
| Pyroglutamyl-peptidase I (EC 3.4.19.3) | pcp FTT_0296 | Q5NHZ7 | 1 |
| Pyrrolidone-carboxylate peptidase (EC 3.4.19.3) (5-oxoprolyl-peptidase) (Pyroglutamyl-peptidase I) (PGP-I) (Pyrase) | pcp Fphi_0621 | B0U124 | 1 |
| Pyrrolidone-carboxylate peptidase (EC 3.4.19.3) (5-oxoprolyl-peptidase) (Pyroglutamyl-peptidase I) (PGP-I) (Pyrase) | pcp SPy_0506 M5005_Spy0417 | P68896 | 1 |
| Pyrroline-5-carboxylate reductase (P5C reductase) (P5CR) (EC 1.5.1.2) (PCA reductase) | proC FTN_1467 | A0Q7X0 | 1 |
| Pyrroline-5-carboxylate reductase (P5C reductase) (P5CR) (EC 1.5.1.2) (PCA reductase) | proC PP_3778 | Q88GE6 | 1 |
| Pyrroline-5-carboxylate reductase (P5C reductase) (P5CR) (EC 1.5.1.2) (PCA reductase) | proC Rv0500 MTCY20G9.26 | P9WHU7 | 1 |
| Pyrroline-5-carboxylate reductase (P5C reductase) (P5CR) (EC 1.5.1.2) (PCA reductase) | proC PA0393 | P22008 | 1 |
| Pyrroline-5-carboxylate reductase (P5C reductase) (P5CR) (EC 1.5.1.2) (PCA reductase) | proC SPy_0112 | Q9A1S9 | 1 |
| Pyrrolo-quinoline quinone | PP1Y_AT5019 | F6II25 | 1 |
| Pyruvate carboxylase (EC 6.4.1.1) (Pyruvic carboxylase) (PYC) | pyc pycA ylaP BSU14860 | Q9KWU4 | 1 |
| Pyruvate carboxylase A subunit (EC 6.4.1.1) | pycA Cj1037c | Q0P9L5 | 1 |
| Pyruvate carboxylase subunit A (EC 6.4.1.1) | B195_01305 | M5QN21 | 1 |
| Pyruvate carboxylase subunit B (EC 6.4.1.1) | B195_01310 | M5R4K2 | 1 |
| Pyruvate dehydrogenase complex, E1 component, alpha subunit, putative (EC 1.2.4.1) | SAOUHSC_01040 | Q2FZG4 | 1 |
| Pyruvate dehydrogenase complex, E1 component, pyruvate dehydrogenase beta subunit, putative (EC 1.2.4.1) | SAOUHSC_01041 | Q2G2A5 | 1 |
| Pyruvate dehydrogenase complex, E1 component, pyruvate dehydrogenase, beta subunit (EC 1.2.4.1) | pdhB MXAN_2667 | Q1D8Y7 | 1 |
| Pyruvate dehydrogenase E1 component (EC 1.2.4.1) | Fphi_1185 | B0TXF2 | 1 |
| Pyruvate dehydrogenase E1 component (EC 1.2.4.1) | pdhA NMB1341 | Q9JZ12 | 1 |
| Pyruvate dehydrogenase E1 component (EC 1.2.4.1) | aceE B195_02848 | M5QMJ2 | 1 |
| Pyruvate dehydrogenase E1 component (EC 1.2.4.1) | aceE STM0152 | Q8ZRT2 | 1 |
| Pyruvate dehydrogenase E1 component (EC 1.2.4.1) | aceE PP_0339 | Q88QZ5 | 1 |
| Pyruvate dehydrogenase E1 component (EC 1.2.4.1) | aceE YPO3419 | Q7CKE6 | 1 |
| Pyruvate dehydrogenase E1 component (EC 1.2.4.1) | SC1083_0757 | G4A7G1 | 1 |
| Pyruvate dehydrogenase E1 component (EC 1.2.4.1) | OOM_0731 | I2AYH4 | 1 |
| Pyruvate dehydrogenase E1 component (EC 1.2.4.1) | aceE SCH_0151 | Q57TA4 | 1 |
| Pyruvate dehydrogenase E1 component (EC 1.2.4.1) | aceE FTT_1485c | Q5NEX2 | 1 |
| Pyruvate dehydrogenase E1 component (PDH E1 component) (EC 1.2.4.1) | aceE Rv2241 MTCY427.22 | P9WIS9 | 1 |
| Pyruvate dehydrogenase E1 component subunit alpha (EC 1.2.4.1) | pdhA MW0976 | P60090 | 1 |
| Pyruvate dehydrogenase E1 component subunit alpha (EC 1.2.4.1) | pdhA MXAN_2666 | Q1D8Y8 | 1 |
| Pyruvate dehydrogenase E1 component subunit beta (EC 1.2.4.1) | pdhB MW0977 | P0A0A2 | 1 |
| Pyruvate dehydrogenase E1 component subunit beta (EC 1.2.4.1) | pdhB | P35488 | 1 |
| Pyruvate dehydrogenase E1 component, beta subunit (EC 1.2.4.1) | pdhB ACL_1311 | A9NHS6 | 1 |
| Pyruvate dehydrogenase [cytochrome] (EC 1.2.2.2) | poxB YPO1358 | Q7CHH9 | 1 |
| Pyruvate formate lyase I, induced anaerobically | pflB SCH_0927 | Q57R28 | 1 |
| Pyruvate formate lyase-activating enzyme 1 | SC1083_2104 | G4AB69 | 1 |
| Pyruvate formate-lyase (EC 2.3.1.54) | SGF_05007 | E7TJY9 | 1 |
| Pyruvate formate-lyase 3 (EC 1.97.1.4) | pflE spr0226 | Q8DRC5 | 1 |
| Pyruvate formate-lyase-activating enzyme (EC 1.97.1.4) | pflC spr1791 | Q8DNE0 | 1 |
| Pyruvate formate-lyase-activating enzyme (EC 1.97.1.4) | pflA VSAK1_00270 | A6D5L7 | 1 |
| Pyruvate formate-lyase-activating enzyme (EC 1.97.1.4) | pflC SPy_0379 | Q9A1A3 | 1 |
| Pyruvate kinase (EC 2.7.1.40) | Fphi_1358 | B0TY22 | 1 |
| Pyruvate kinase (EC 2.7.1.40) | pykA KPN_02369 | A6TB24 | 1 |
| Pyruvate kinase (EC 2.7.1.40) | pyk AC3_0482 | B1BNU7 | 1 |
| Pyruvate kinase (EC 2.7.1.40) | pykA YPO2064 | Q7CIC4 | 1 |
| Pyruvate kinase (EC 2.7.1.40) | pykF S1838 SF1705 AJR25_008630 AJR27_003155 | Q83KW7 | 1 |