D-Mannose 6-phosphate
Mannose 6-phosphate, also known as alpha-D-mannose-6-p or man-6-p, belongs to the class of organic compounds known as hexose phosphates. These are carbohydrate derivatives containing a hexose substituted by one or more phosphate groups. Mannose 6-phosphate exists in all eukaryotes, ranging from yeast to humans. Within humans, mannose 6-phosphate participates in a number of enzymatic reactions. In particular, mannose 6-phosphate can be converted into fructose 6-phosphate through its interaction with the enzyme mannose-6-phosphate isomerase. In addition, mannose 6-phosphate can be biosynthesized from D-mannose through the action of the enzyme hexokinase-1. Mannose 6-phosphate is a potent competitive inhibitor of pinocytosis of human platelet beta-glucuronidase and it is a necessary component of the recognition marker on the enzyme for pinocytosis by human fibroblasts as well (PMID 908752). In humans, mannose 6-phosphate is involved in fructose intolerance, hereditary.
| ID | EC Number | Name |
|---|---|---|
| KEGG:R00772 | 5.3.1.8 | D-mannose-6-phosphate aldose-ketose-isomerase |
| KEGG:R01326 | 2.7.1.1 | ATP:D-mannose 6-phosphotransferase |
| KEGG:R01327 | 2.7.1.1 | ITP:D-mannose 6-phosphotransferase |
| KEGG:R01330 | 2.7.1.1 | dATP:D-mannose 6-phosphotransferase |
| KEGG:R01817 | 1.1.1.224 | D-mannitol-1-phosphate:NADP+ 6-oxidoreductase |
| KEGG:R01818 | 5.4.2.8 | D-mannose 6-phosphate 1,6-phosphomutase |
| KEGG:R01819 | 5.3.1.8 | D-mannose-6-phosphate aldose-ketose-isomerase |
| KEGG:R02630 | 2.7.1.191 | protein-N(pi)-phosphohistidine:D-mannose 6-phosphotransferase |
| KEGG:R08405 | 2.7.1.61 | acyl-phosphate:D-mannose phosphotransferase |
| KEGG:R09645 | 3.2.1.- | C16699 + C00001<=>C00275 + C00258 |
| KEGG:R11439 | 2.5.1.132 | phosphoenolpyruvate:D-mannose-6-phosphate 1-(2-carboxy-2-oxoethyl)transferase |
| KEGG:R13490 | 4.2.3.230 | D-mannose-6-phosphate phosphate-lyase (2-deoxy-4-epi-scyllo-inosose-forming) |