| Membrane-fusion protein | VSAK1_12752 | A6D8R7 | 1 |
| Membrane-spanning inner membrane protein | tolQ SSON_0689 | Q3Z467 | 1 |
| Menaquinone biosynthesis methyltransferase, putative (EC 2.1.1.-) | SAOUHSC_01487 | Q2FYG5 | 1 |
| Meromycolate extension acyl carrier protein (ACP) | acpM Rv2244 MTCY427.25 | P9WQF3 | 1 |
| Metabolite MFS transporter, MHS family | PP_2569 | Q88JS8 | 1 |
| Metal ion transporter | KU39_2473 | A0A0K2L650 | 1 |
| Metal-dependent exopeptidase | FTN_0965 | A0Q6I8 | 1 |
| Metalloendopeptidase-like membrane protein | B195_11531 | M5QV45 | 1 |
| Metallothionein (MT) (Copper-binding metallothionein) (Cu(I)-binding metallothionein) (Mycobacterial metallothionein) | mymT Rv0186A | P9WK09 | 1 |
| Methanol dehydrogenase regulatory protein | moxR FTT_0290 | Q5NI02 | 1 |
| Methionine aminopeptidase (MAP) (MetAP) (EC 3.4.11.18) (Peptidase M) | map SPCG_1194 | B2IQ22 | 1 |
| Methionine aminopeptidase (MAP) (MetAP) (EC 3.4.11.18) (Peptidase M) | map spr0992 | Q8DPV1 | 1 |
| Methionine aminopeptidase (MAP) (MetAP) (EC 3.4.11.18) (Peptidase M) | map PA3657 | Q9HXY1 | 1 |
| Methionine aminopeptidase (MAP) (MetAP) (EC 3.4.11.18) (Peptidase M) | map SPy_1354 | Q99Z81 | 1 |
| Methionine gamma-lyase (EC 4.4.1.11) | B195_09709 | M5QKT7 | 1 |
| Methionine import ATP-binding protein MetN (EC 3.6.3.-) | metN spr0149 | Q8DRF9 | 1 |
| Methionine import ATP-binding protein MetN (EC 3.6.3.-) | metN yusC BSU32750 | O32169 | 1 |
| Methionine import ATP-binding protein MetN (EC 3.6.3.-) | metN Smlt4088 | B2FHW5 | 1 |
| Methionine import ATP-binding protein MetN (EC 3.6.3.-) | metN SPy_0320 M5005_Spy0272 | Q9A1E3 | 1 |
| Methionine import ATP-binding protein MetN (EC 3.6.3.-) | metN FTT_1124 | Q5NFU5 | 1 |
| Methionine import ATP-binding protein MetN (EC 3.6.3.-) | metN LMRG_02587 | A0A0H3GD63 | 1 |
| Methionine import ATP-binding protein MetN 2 (EC 3.6.3.-) | metN2 SAOUHSC_00842 | Q2FZZ2 | 1 |
| Methionine synthase (EC 2.1.1.13) (5-methyltetrahydrofolate--homocysteine methyltransferase) (Methionine synthase, vitamin-B12 dependent) (MS) | metH PA1843 | Q9I2Q2 | 1 |
| Methionine uptake transporter (MUT) family protein, membrane and periplasmic protein | metlQ FTN_1107 | A0Q6X8 | 1 |
| Methionine--tRNA ligase (EC 6.1.1.10) (Methionyl-tRNA synthetase) (MetRS) | metG jhp_0967 | Q9ZKG9 | 1 |
| Methionine--tRNA ligase (EC 6.1.1.10) (Methionyl-tRNA synthetase) (MetRS) | metG FTN_0468 | A0Q556 | 1 |
| Methionine--tRNA ligase (EC 6.1.1.10) (Methionyl-tRNA synthetase) (MetRS) | metG YPO1522 y2648 YP_1411 | Q8ZG01 | 1 |
| Methionine--tRNA ligase (EC 6.1.1.10) (Methionyl-tRNA synthetase) (MetRS) | metG metS Rv1007c MTCI237.24 | P9WFU5 | 1 |
| Methionine--tRNA ligase (EC 6.1.1.10) (Methionyl-tRNA synthetase) (MetRS) | metG PA3482 | Q9HYC7 | 1 |
| Methionine--tRNA ligase (EC 6.1.1.10) (Methionyl-tRNA synthetase) (MetRS) | metG b2114 JW2101 | P00959 | 1 |
| Methionine--tRNA ligase (EC 6.1.1.10) (Methionyl-tRNA synthetase) (MetRS) | metG SSON_2163 | Q3Z096 | 1 |
| Methionine--tRNA ligase (EC 6.1.1.10) (Methionyl-tRNA synthetase) (MetRS) | metG metS SPy_0422 M5005_Spy0345 | Q9A178 | 1 |
| Methionine--tRNA ligase (EC 6.1.1.10) (Methionyl-tRNA synthetase) (MetRS) | metG NSU_4326 | G6EJ05 | 1 |
| Methionyl-tRNA formyltransferase (EC 2.1.2.9) | fmt PA0018 | O85732 | 1 |
| Methionyl-tRNA formyltransferase (EC 2.1.2.9) | fmt SPy_1628 M5005_Spy1338 | Q99YM7 | 1 |
| Methyl accepting chemotaxis protein II, aspartate sensor-receptor | cheM SCH_1926 | Q57N79 | 1 |
| Methyl-accepting chemotaxis (MCP) signaling domain protein | KU39_432 | A0A0K2L0A8 | 1 |
| Methyl-accepting chemotaxis (MCP) signaling domain protein | KU39_2078 | A0A0K2L521 | 1 |
| Methyl-accepting chemotaxis protein | MXAN_1248 | Q1DCW6 | 1 |
| Methyl-accepting chemotaxis protein | AHA_2535 | A0KL97 | 1 |
| Methyl-accepting chemotaxis protein I, serine sensor receptor | tsr SCH_4385 | Q57G71 | 1 |
| Methyl-accepting chemotaxis protein II (MCP-II) (Aspartate chemoreceptor protein) | tar cheM b1886 JW1875 | P07017 | 1 |
| Methyl-accepting chemotaxis protein PctA | pctA PA4309 | G3XD24 | 1 |
| Methyl-accepting chemotaxis protein signaling domain protein | ANACOL_03921 | B0PGQ3 | 1 |
| Methyl-accepting chemotaxis protein TlpA | tlpA BSU31250 | P39216 | 1 |
| Methylase of chemotaxis methyl-accepting protein | VSAK1_02929 | A6CX78 | 1 |
| Methylated-DNA--protein-cysteine methyltransferase (EC 2.1.1.63) (6-O-methylguanine-DNA methyltransferase) (MGMT) (O-6-methylguanine-DNA-alkyltransferase) | VSAK1_20474 | A6CY72 | 1 |
| Methylenetetrahydrofolate dehydrogenase/methenyltetrahydrofolate cyclohydrolase (Fragment) | VSAK1_08676 | A6D9K4 | 1 |
| Methylenetetrahydrofolate reductase (EC 1.5.1.20) | metF PA0430 | Q9I687 | 1 |
| Methylenetetrahydrofolate reductase (EC 1.5.1.20) | Smlt2582 | B2FSU8 | 1 |
| Methylenetetrahydrofolate--tRNA-(uracil-5-)-methyltransferase TrmFO (EC 2.1.1.74) (Folate-dependent tRNA (uracil-5-)-methyltransferase) (Folate-dependent tRNA(M-5-U54)-methyltransferase) | trmFO gid spr0844 | Q8DQ51 | 1 |
| Methylenetetrahydrofolate--tRNA-(uracil-5-)-methyltransferase TrmFO (EC 2.1.1.74) (Folate-dependent tRNA (uracil-5-)-methyltransferase) (Folate-dependent tRNA(M-5-U54)-methyltransferase) | trmFO gid SPy_1173 M5005_Spy0893 | Q99ZL9 | 1 |
| Methylglyoxal synthase (MGS) (EC 4.2.3.3) | mgsA VSAK1_14692 | A6D7E9 | 1 |
| Methylisocitrate lyase | KW89_695 | A0A0K2DUY7 | 1 |
| Methylmalonate-semialdehyde dehydrogenase | B195_03882 | M5QL79 | 1 |
| Methylthioribulose-1-phosphate dehydratase (MTRu-1-P dehydratase) (EC 4.2.1.109) | mtnB PA1683 | Q9I342 | 1 |
| Methyltransferase | FTN_1158 | A0Q729 | 1 |
| MetQ | HPSD74_0537 | U4SJW1 | 1 |
| Mevalonate kinase | mvaK1 SPy_0876 | Q9A098 | 1 |
| Mevalonate pyrophosphate decarboxylase | mvaD SPy_0877 | Q9A097 | 1 |
| MexH family multidrug efflux RND transporter periplasmic adaptor subunit | KW89_1262 | A0A0K2DWK6 | 1 |
| MexH family multidrug efflux RND transporter periplasmic adaptor subunit | KW89_2927 | A0A0K2E0T9 | 1 |
| MFP transporter | KW89_811 | A0A0K2DVA2 | 1 |
| MFS family, sn-glycerol-3-phosphate transport protein | glpT SCH_2286 | Q57M70 | 1 |
| MFS transporter | KW89_2094 | A0A0K2DYX1 | 1 |
| Mg-dependent DNase | FTN_1408 | A0Q7R3 | 1 |
| MglB protein | mglB KPR_1505 | R4YDJ2 | 1 |
| MHC class II analog protein | SAOUHSC_02161 | Q2FWW1 | 1 |
| Mini-ribonuclease 3 (Mini-3) (Mini-RNase 3) (EC 3.1.26.-) (Mini-RNase III) (Mini-III) | mrnC SPy_1940 | Q99Y00 | 1 |
| Minor extracellular protease vpr (EC 3.4.21.-) | vpr BSU38090 ipa-45r | P29141 | 1 |
| Minor fimbrium anchoring subunit Mfa2 (Minor fimbrial antigen 2) | mfa2 PGN_0288 | B2RHG2 | 1 |
| Minor fimbrium subunit Mfa1 (Pg-II fim a) | mfa1 PGN_0287 | B2RHG1 | 1 |
| Minor fimbrium subunit Mfa5 | PGN_0291 | B2RHG5 | 1 |
| Minor fimbrium tip subunit Mfa3 | mfa3 PGN_0289 | B2RHG3 | 1 |
| Minor fimbrium tip subunit MfA4 (Immunoreactive 32 kDa antigen PG49) | mfA4 PG_0181 | Q7MXK0 | 1 |
| Minor fimbrium tip subunit MfA4 (Immunoreactive 32 kDa antigen) | PGN_0290 | B2RHG4 | 1 |
| Miropsin-2 | 0 | A0A0F7INH7 | 1 |
| MIT family metal ion transporter | LMRG_00526 | A0A0H3GFC2 | 1 |
| Mitogenic exotoxin Z | smeZ SPy_1998 | Q99XW1 | 1 |
| Mitogenic factor | mf SPy_2043 | Q7DAK9 | 1 |
| Mixed type I polyketide synthase-peptide synthetase | MXAN_3933 | Q1D5G0 | 1 |
| MlaC | yrbC HPSD74_0859 | U4SKC5 | 1 |
| MltA-interacting MipA | NSU_1061 | G6E9P0 | 1 |
| MltA-interacting protein | mipA SF1441 S1556 | P0A909 | 1 |
| MMPL family protein | KW89_3011 | A0A0K2E113 | 1 |
| MMS1, Mono-functional DNA-alkylating agent methyl | OOM_0943 | I2AZ11 | 1 |
| Modulator of FtsH protease HflC | hflC hflA b4175 JW4133 | P0ABC3 | 1 |
| Molybdate ABC transporter periplasmic molybdate-binding protein | LMRG_00502 | A0A0H3GBM1 | 1 |
| Molybdate ABC transporter, ATPase subunit | Cpha266_0452 | A1BDN3 | 1 |
| Molybdate ABC transporter, molybdate-binding protein | modA CPC_2335 | B1BID1 | 1 |
| Molybdate ABC transporter, periplasmic molybdate-binding protein | modA HPSD74_1576 | U4SFG5 | 1 |
| Molybdate-binding periplasmic protein | modA PP_3828 | Q88G97 | 1 |
| Molybdate-binding periplasmic protein | modA YPO1145 | Q0WHQ4 | 1 |
| Molybdenum ABC transporter, periplasmic molybdate-binding protein | SAOUHSC_02549 | Q2FVX4 | 1 |
| Molybdenum cofactor biosynthesis protein B | moaB STM0803 | Q7CQW6 | 1 |
| Molybdenum cofactor guanylyltransferase (MoCo guanylyltransferase) (EC 2.7.7.77) (GTP:molybdopterin guanylyltransferase) (Mo-MPT guanylyltransferase) (Molybdopterin guanylyltransferase) (Molybdopterin-guanine dinucleotide synthase) (MGD synthase) | mobA VSAK1_26220 | A6D134 | 1 |
| Molybdenum import ATP-binding protein ModC (EC 3.6.3.29) | modC SSON_0717 | Q3Z445 | 1 |
| Molybdopterin adenylyltransferase (MPT adenylyltransferase) (EC 2.7.7.75) | mog mogA jhp_0735 | Q9ZL45 | 1 |
| Molydopterin containing oxidoreductase | Cj0005c | Q0PCC0 | 1 |
| Monofunctional glycosyltransferase (MGT) (EC 2.4.1.129) (Peptidoglycan TGase) | mgt SAOUHSC_02012 | Q93Q23 | 1 |