catalytic activity:GTP + alpha-D-mannose 1-phosphate = diphosphate + GDP-mannose.,pathway:Protein modification; protein glycosylation.,sequence caution:Originally thought to be a fragment.,similarity:Belongs to the transferase hexapeptide repeat family.,
Cytoplasm . Myc-tagged GMPPA shows a diffuse cytoplasmic and nuclear pattern in transfected COS-7 cells.
Expressed in fibroblasts (at protein level).