Muscle glycogen synthesis is normally initiated by the autoglycosylation of glycogenin 1 (GYG1) to form oligo (1,4)-alpha-D-glucosyl GYG1. A missense mutation of GYG1 yields a protein that cannot undergo glucosylation, leading to failure of glycogen synthesis, associated with muscle weakness and other abnormalities (Moslemi et al. 2010).
Nilsson, J, Oldfors, A, Lindberg, C, Moslemi, AR, Andersson, B, Tajsharghi, H
glycogenin glucosyltransferase activity of mutant GYG1:GYS1-a tetramer [cytosol]
Loss of function of mutant GYG1:GYS1-a tetramer [cytosol]
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