| Maltogenic alpha-amylase | Geobacillus stearothermophilus | Converts starch into maltose. | 3 | Details |
| Maltogenic amylase | Thermus sp. IM6501 | Not Available | 1 | Details |
| Maltoporin | Escherichia coli (strain K12) | Involved in the transport of maltose and maltodextrins. Indispensable for translocation of maltodextrins (alpha 1-4 l... more | 3 | Details |
| Maltoporin | Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720) | Involved in the transport of maltose and maltodextrins. Does not act as a receptor for phages. | 2 | Details |
| Maltose-6'-phosphate glucosidase | Bacillus subtilis (strain 168) | Hydrolyzes maltose-6'-phosphate and trehalose-6'-phosphate. Is involved in the catabolism of alpha-glycosides accumul... more | 1 | Details |
| Maltose/maltodextrin-binding periplasmic protein | Escherichia coli (strain K12) | Part of the ABC transporter complex MalEFGK involved in maltose/maltodextrin import. Binds maltose and higher maltode... more | 6 | Details |
| Mandelate racemase | Pseudomonas putida | Not Available | 4 | Details |
| Manganese catalase | Lactobacillus plantarum | Catalyzes the decomposition of hydrogen peroxide into water and oxygen. | 1 | Details |
| Manganese cation | Humans | Not Available | 4 | Details |
| Mannan endo-1,4-beta-mannosidase | Cellvibrio japonicus (strain Ueda107) | Catalyzes the endo hydrolysis of beta-1,4-linked mannan and galactomannan, but displays little activity towards other... more | 5 | Details |
| Mannan-binding lectin serine protease 1 | Humans | Precursor of a serum protease that activates the complement pathway of the complement system, a cascade of proteins t... more | 1 | Details |
| Mannan-binding lectin serine protease 2 | Humans | Precursor of a serum protease that activates the lectin pathway of the complement system, a cascade of proteins that ... more | 2 | Details |
| Mannitol dehydrogenase | Pseudomonas fluorescens | Not Available | 1 | Details |
| Mannose-binding protein C | Humans | Calcium-dependent lectin, which acts as a pattern recognition receptor that initiates the lectin pathway of the compl... more | 9 | Details |
| Mannosyl-oligosaccharide alpha-1,2-mannosidase | Penicillium citrinum | Involved in the maturation of Asn-linked oligosaccharides. Progressively trim alpha-1,2-linked mannose residues from ... more | 2 | Details |
| Mannosyl-oligosaccharide glucosidase | Humans | In the context of N-glycan degradation, cleaves the distal alpha 1,2-linked glucose residue from the Glc(3)Man(9)GlcN... more | 1 | Details |
| MAP kinase-activated protein kinase 2 | Humans | Stress-activated serine/threonine-protein kinase involved in cytokine production, endocytosis, reorganization of the ... more | 10 | Details |
| MAP kinase-activated protein kinase 3 | Humans | Stress-activated serine/threonine-protein kinase involved in cytokines production, endocytosis, cell migration, chrom... more | 2 | Details |
| MAP kinase-activated protein kinase 5 | Humans | Tumor suppressor serine/threonine-protein kinase involved in mTORC1 signaling and post-transcriptional regulation. Ph... more | 3 | Details |
| MAP kinase-interacting serine/threonine-protein kinase 1 | Humans | May play a role in the response to environmental stress and cytokines. Appears to regulate translation by phosphoryla... more | 3 | Details |
| MAP kinase-interacting serine/threonine-protein kinase 2 | Humans | Serine/threonine-protein kinase that phosphorylates SFPQ/PSF, HNRNPA1 and EIF4E. May play a role in the response to e... more | 3 | Details |
| MAP/microtubule affinity-regulating kinase 3 | Humans | Serine/threonine-protein kinase. Involved in the specific phosphorylation of microtubule-associated proteins for MAP2... more | 2 | Details |
| MAP/microtubule affinity-regulating kinase 4 | Humans | Serine/threonine-protein kinase. Phosphorylates the microtubule-associated protein MAPT/TAU. Also phosphorylates the ... more | 1 | Details |
| Mas-related G protein-coupled receptor member X2 | Humans | Mast cell-specific G protein-coupled receptor for basic secretagogues, which regulates mast cell degranulation and it... more | 6 | Details |
| Mast/stem cell growth factor receptor Kit | Humans | Tyrosine-protein kinase that acts as a cell-surface receptor for the cytokine KITLG/SCF and plays an essential role i... more | 51 | Details |