| Malate dehydrogenase (EC 1.1.1.37) | mdh YPO3516 y0668 YP_0567 | P61892 | 1 |
| Malate dehydrogenase (EC 1.1.1.37) | mdh Rv1240 MTV006.12 | P9WK13 | 1 |
| Malate dehydrogenase (EC 1.1.1.37) | mdh KPR_4827 | R4YIZ6 | 1 |
| Malate dehydrogenase (EC 1.1.1.37) | mdh SSON_3378 | Q3YX11 | 1 |
| Malate dehydrogenase (EC 1.1.1.37) | mdh FSU_3185 | C9RMG7 | 1 |
| Malate dehydrogenase (EC 1.1.1.37) | mdh FTT_0535c | Q5NHC8 | 1 |
| Malate dehydrogenase (EC 1.1.1.37) (Vegetative protein 69) (VEG69) | mdh citH BSU29120 | P49814 | 1 |
| Malate dehydrogenase (NADP(+)) | B195_02608 | M5QZN0 | 1 |
| Malate dehydrogenase (Oxaloacetate-decarboxylating) (NADP(+)) (EC 1.1.1.40) | Fphi_0394 | B0TZQ3 | 1 |
| Malate oxidoreductase (EC 1.1.1.38) | Cj1287c | Q0P8X0 | 1 |
| Malate synthase (EC 2.3.3.9) | VSAK1_24895 | A6CZ35 | 1 |
| Malate synthase A (EC 2.3.3.9) | aceB YPO3726 | Q0WAT2 | 1 |
| Malate synthase A (MSA) (EC 2.3.3.9) | aceB mas b4014 JW3974 | P08997 | 1 |
| Malate synthase G (EC 2.3.3.9) | glcB Rv1837c MTCY1A11.06 | P9WK17 | 1 |
| Malate synthase G (MSG) (EC 2.3.3.9) | glcB glc b2976 JW2943 | P37330 | 1 |
| Malate:quinone oxidoreductase (EC 1.1.5.4) (MQO) (Malate dehydrogenase [quinone]) | mqo jhp_0079 | Q9ZMY5 | 1 |
| Maleylacetoacetate isomerase | B195_05226 | M5QLK8 | 1 |
| Maleylacetoacetate isomerase (MAAI) (EC 5.2.1.2) | maiA PA2007 | P57109 | 1 |
| Malonyl CoA-acyl carrier protein transacylase (EC 2.3.1.39) | Fphi_1350 | B0TY14 | 1 |
| Malonyl CoA-acyl carrier protein transacylase (EC 2.3.1.39) | fabD YPO1598 | Q7CJ24 | 1 |
| Malonyl CoA-acyl carrier protein transacylase (EC 2.3.1.39) | fabD SPy_1750 | Q99YD5 | 1 |
| Malonyl CoA-acyl carrier protein transacylase (EC 2.3.1.39) | FTT_1374 | Q5NF69 | 1 |
| Maltodextrin-binding protein | SAOUHSC_00176 | Q2G1E9 | 1 |
| Maltodextrose utilization protein MalA | malA SPy_1298 M5005_Spy1062 | Q99ZB6 | 1 |
| Maltoporin | VS_II0158 | B7VQC8 | 1 |
| Maltoporin (Maltose-inducible porin) | lamB malL STM4231 | P26466 | 1 |
| Maltoporin (Maltose-inducible porin) | lamB SCH_4110 | Q57GZ6 | 1 |
| Maltoporin (Maltose-inducible porin) (Outer membrane protein S) | lamB ompS VC_A1028 | Q56652 | 1 |
| Maltoporin 2 (Maltose-inducible porin 2) | lamB2 KPN78578_43560 KPN_04425 | A6TGU6 | 1 |
| Maltose ABC transporter, periplasmic maltose-binding protein | VC_A0945 | Q9KL05 | 1 |
| Maltose operon periplasmic protein | VS_II0159 | B7VQC9 | 1 |
| Maltose operon periplasmic protein, putative | VC_A1027 | Q9KKS3 | 1 |
| Maltose-binding periplasmic protein | malE YPO3714 | Q7CLD8 | 1 |
| Manganese ABC transporter substrate-binding lipoprotein (Pneumococcal surface adhesin A) | psaA spr1494 | P0A4G3 | 1 |
| Manganese ABC transporter, ATP-binding protein | SPCG_1621 | B2IRQ4 | 1 |
| Manganese transport system ATP-binding protein MntB | mntB ytgB BSU30760 | O34338 | 1 |
| Mannonate dehydratase (EC 4.2.1.8) (D-mannonate hydro-lyase) | uxuA VSAK1_20699 | A6CYB7 | 1 |
| Mannonate oxidoreductase | VSAK1_20664 | A6CYB0 | 1 |
| Mannose-1-phosphate guanylyltransferase | manC FTN_1418 | A0Q7S2 | 1 |
| Mannose-specific phosphotransferase system component IIAB (EC 2.7.1.69) | manL SPy_1738 | Q99YE6 | 1 |
| Mannose-specific PTS system IIB component | LMRG_01150 | A0A0H3GIL9 | 1 |
| Mannose-specific PTS system IIC component | LMRG_02346 | A0A0H3G8Z8 | 1 |
| Mannose-specific PTS system IID component | LMRG_00469 | A0A0H3GAW9 | 1 |
| Mannose-specific PTS system protein IID | SC1083_1521 | G4A9K7 | 1 |
| Mannose/glucose ABC transporter, glucose-binding periplasmic protein | gtsA PP_1015 | Q88P38 | 1 |
| ManZ | manZ HPSD74_0733 | U4SKG5 | 1 |
| Mce family protein | MXAN_3719 | Q1D618 | 1 |
| MdlB protein | SC1083_0271 | G4A632 | 1 |
| Mechanosensitive channel MscK (Potassium efflux system KefA) | mscK aefA kefA b0465 JW0454 | P77338 | 1 |
| Mechanosensitive channel protein, intermediate (Smaller, MscS-like) conductance, K+ efflux | kefA PP_5067 | Q88CW3 | 1 |
| Mechanosensitive ion channel (Fragment) | VSAK1_14340 | A6D9C5 | 1 |
| Mechanosensitive ion channel protein | msc FTT_0475 | Q5NHH9 | 1 |
| Medium-long chain acyl-CoA dehydrogenase (EC 1.3.8.-) | fadE PP_1893 | Q88LN6 | 1 |
| Membrane fusion protein | FTN_0718 | A0Q5U5 | 1 |
| Membrane fusion protein | FTN_1609 | A0Q8A4 | 1 |
| Membrane fusion protein | OOM_0482 | I2AXW4 | 1 |
| Membrane fusion protein | OOM_0599 | I2AY65 | 1 |
| Membrane protein | NSU_0791 | G6E8X0 | 1 |
| Membrane protein | FSU_1029 | A7UG46 | 1 |
| Membrane protein | FSU_2404 | A7UG45 | 1 |
| Membrane protein | FSU_0230 | A7UG44 | 1 |
| Membrane protein | FSU_2807 | A7UG52 | 1 |
| Membrane protein | FSU_2009 | A7UG47 | 1 |
| Membrane protein | FSU_2010 | A7UG48 | 1 |
| Membrane protein | KW89_49 | A0A0K2DT36 | 1 |
| Membrane protein | KW89_2213 | A0A0K2DZA7 | 1 |
| Membrane protein | KW89_2474 | A0A0K2DZK3 | 1 |
| Membrane protein | KW89_2764 | A0A0K2E0E8 | 1 |
| Membrane protein | KU39_387 | A0A0K2L058 | 1 |
| Membrane protein | LMRG_02021 | A0A0H3GFC1 | 1 |
| Membrane protein component of ABC phosphate transporter | pstC PA5368 | G3XD02 | 1 |
| Membrane protein insertase YidC (Foldase YidC) (Membrane integrase YidC) (Membrane protein YidC) | yidC NMB1907 | Q9JXS4 | 1 |
| Membrane protein insertase YidC (Foldase YidC) (Membrane integrase YidC) (Membrane protein YidC) | yidC SC1083_1789 | G4AAB6 | 1 |
| Membrane protein insertase YidC (Foldase YidC) (Membrane integrase YidC) (Membrane protein YidC) | yidC HPSD74_1544 | U4SFT4 | 1 |
| Membrane protein insertase YidC (Foldase YidC) (Membrane integrase YidC) (Membrane protein YidC) | yidC Smlt4693 | B2FPA5 | 1 |
| Membrane protein insertase YidC (Foldase YidC) (Membrane integrase YidC) (Membrane protein YidC) | yidC OOM_0048 | I2AWR7 | 1 |
| Membrane protein insertase YidC (Foldase YidC) (Membrane integrase YidC) (Membrane protein YidC) | yidC SCH_3759 | Q57HZ7 | 1 |
| Membrane protein insertase YidC (Foldase YidC) (Membrane integrase YidC) (Membrane protein YidC) | yidC SAOUHSC_02327 | Q2FWG4 | 1 |
| Membrane protein insertase YidC (Foldase YidC) (Membrane integrase YidC) (Membrane protein YidC) | yidC FTT_0233c | Q5NI56 | 1 |
| Membrane protein insertase YidC 2 (Foldase YidC 2) (Membrane integrase YidC 2) (Membrane protein YidC 2) | yidC2 spr1852 | Q8DN93 | 1 |
| Membrane protein YknW | yknW BSU14340 | O31709 | 1 |
| Membrane protein, MmpL family | AC3_0727 | B1BUT9 | 1 |
| Membrane protein, putative | SAOUHSC_00200 | Q2G1C5 | 1 |
| Membrane spanning protein, putative | SAOUHSC_02821 | Q2FVB3 | 1 |
| Membrane-bound lytic murein transglycosylase A | mltA KPN_03164 | A6TD94 | 1 |
| Membrane-bound lytic murein transglycosylase A | mltA HPSD74_0681 | U4SN42 | 1 |
| Membrane-bound lytic murein transglycosylase A (EC 3.2.1.-) | mltA STM2988 | Q8ZMC0 | 1 |
| Membrane-bound lytic murein transglycosylase A (EC 4.2.2.n1) (Murein hydrolase A) | mltA VC_2312 | Q9KPQ4 | 1 |
| Membrane-bound lytic murein transglycosylase A (EC 4.2.2.n1) (Murein hydrolase A) | mltA S3022 SF2827 AJR25_008035 AJR27_008975 | Q83JW2 | 1 |
| Membrane-bound lytic murein transglycosylase A (EC 4.2.2.n1) (Murein hydrolase A) | OOM_0474 | I2AXV7 | 1 |
| Membrane-bound lytic murein transglycosylase A (EC 4.2.2.n1) (Murein hydrolase A) | mltA FTT_1271 | Q5NFG5 | 1 |
| Membrane-bound lytic murein transglycosylase B | mltB KPN_03036 | A6TCW6 | 1 |
| Membrane-bound lytic murein transglycosylase B (EC 3.2.1.-) | mltB STM2831 | Q7CPY6 | 1 |
| Membrane-bound lytic murein transglycosylase B (EC 3.2.1.-) | mltB PP_4805 | Q88DM0 | 1 |
| Membrane-bound lytic murein transglycosylase B (EC 4.2.2.n1) (35 kDa soluble lytic transglycosylase) (Murein hydrolase B) (Slt35) | mltB b2701 JW2671 | P41052 | 1 |
| Membrane-bound lytic murein transglycosylase F (EC 4.2.2.n1) (Murein lyase F) | mltF PA3764 | Q9HXN1 | 1 |
| Membrane-bound lytic murein transglycosylase F (EC 4.2.2.n1) (Murein lyase F) | mltF VSAK1_11825 | A6D2U1 | 1 |
| Membrane-bound lytic murein transglycosylase F (EC 4.2.2.n1) (Murein lyase F) | mltF yfhD b2558 JW2542 | P0AGC5 | 1 |
| Membrane-fusion protein | VSAK1_25660 | A6D2P4 | 1 |
| Membrane-fusion protein | VSAK1_07764 | A6D7A7 | 1 |