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Mannose is a sugar with the formula HOCH 2 (CHOH) 4 CHO.It is one of the monomers of the aldohexose series of carbohydrates.It is a C-2 epimer of glucose.Mannose is important in human metabolism, especially in the glycosylation of certain proteins.
GDP-mannose is produced from GTP and mannose-6-phosphate by the enzyme mannose-1-phosphate guanylyltransferase. The degradation of mannans (and many related forms of hemicellulose) has been well studied. The hydrolysis of the main mannan backbone is catalyzed by various enzymes including β-mannosidase, β-glucosidase, and β-mannase.
Guanosine diphosphate mannose or GDP-mannose is a nucleotide sugar that is a substrate for glycosyltransferase reactions in metabolism. This compound is a substrate for enzymes called mannosyltransferases. Known as donor of activated mannose in all glycolytic reactions, GDP-mannose is essential in eukaryotes. [1]
The enzyme GDP-Mannose 4, 6-Dehydratase is in the lyase family of enzymes, specifically the hydro-lyases. Other names in use include guanosine 5'-diphosphate-D-mannose oxidoreductase, guanosine diphosphomannose oxidoreductase, guanosine diphosphomannose 4,6-dehydratase, GDP-D-mannose dehydratase, GDP-D-mannose 4,6-dehydratase, GMD, and GDP-mannose 4,6-hydro-lyase.
In enzymology, a phosphomannomutase (EC 5.4.2.8) is an enzyme that catalyzes the chemical reaction. alpha-D-mannose 1-phosphate D-mannose 6-phosphate. Hence, this enzyme has one substrate, alpha-D-mannose 1-phosphate, and one product, D-mannose 6-phosphate.
A segment of galactomannan showing mannose backbone (below) with a branching galactose unit (top) Galactomannans are polysaccharides consisting of a mannose backbone with galactose side groups, more specifically, a (1-4)-linked beta-D-mannopyranose backbone with branchpoints from their 6-positions linked to alpha-D-galactose, (i.e. 1-6-linked alpha-D-galactopyranose).
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