Guanosine diphosphate-mannose
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GDP-Man is not only the mannose donor for glycoprotein synthesis, but it is also the precursor of l-fucose, a deoxyhexose that is an important recognition signal in many glycoproteins and glycolipids. The conversion of GDP-d-Man to GDP-l-fucose involves a complex series of oxidative and reductive steps, as well as epimerizations. Failure of this pathway causes leukocyte adhesion deficiency disease (LAD).
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