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MANNOSE
-Gulshan Banu
BASIC INTRODUCTION:
D-mannose is a hexose
monosaccharide,that belongs to
group of aldose.(aldohexos).
Mannose commonly exsits as two
different rings,the pyranose(six –
memberd)form and furanose (five –
Mannoseistransportedtomammaliancellsviafacilitated
diffusionbyhexosetransporterpresentonplasma
membrane.
Withinthecell,mannoseisphosphorylatedbyHexokinase
(HK)toproduceMannose-6-phosphate(Man-6-p).
Itiseithercatabolizedbyphosphomannoseisomerace
(MIP)ordirectedtoN-glycosylationvia
phosphomannomutase(PMM2).
ThefateofMan-6-P largelydependsontheratioofMPItoPMM2within
acell–higherratioleadstogreatercatabolism,whilelowerratio favors
theglycosylation pathway.
PMM2-derivedmannose-1-phosphate(Man-1-P)isthenincorporatedinto
severalglycosylation intermediatesincludingGDP-mannose(GDP-Man),
GDP-fucose,anddolichol phosphatemannose(Dol-P-Man).
TheseintermediatesthencontributetoN-glycosylation, O-glycosylation,
C-mannosylation, andGPIanchorsynthesis.
N-linkedglycosylationplaysanessentialroleinthefolding
andthe qualitycontrolofproteinsintheER.
O-Mannosylation isknownasayeast-type modification,and
O-mannosylated glycoproteinsareabundant intheyeast cell
wall.
C-Mannosylation isapost-translationalmodificationof
proteinsintheendoplasmicreticulum.
.

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mannose a sugar monomer of aldohexose series of carbohydrate