Catalytic subunit of the glycosylphosphatidylinositol-mannosyltransferase I complex which catalyzes the transfer of the first mannose, via an alpha-1,4 bond from a dolichol-phosphate-mannose (Dol-P-Man) to a 2-acyl-6-alpha-D-glucosaminyl-1-(1-radyl,2-acyl-sn-glycero-3-phospho)-1D-myo-inositol (glucosaminyl acyl phosphatidylinositol, GlcN-(acyl)PI) intermediate to generate 2-acyl-6-(alpha-D-mannosyl-(1->4)-alpha-D-glucosaminyl)-1-(1-radyl,2-acyl-sn-glycero-3-phospho)-1D-myo-inositol (also termed

Endoplasmic reticulum membrane

Glycosylphosphatidylinositol biosynthesis defect 1

An autosomal recessive disorder characterized by portal vein thrombosis and portal hypertension, absence seizures, macrocephaly, splenomegaly, cytopenias and early-onset cerebral infarctions.

Acyltransferase that catalyzes the acyl transfer from an acyl-CoA at the 2-OH position of the inositol ring of a 6-(alpha-D-glucosaminyl)-1-(1,2-diacyl-sn-glycero-3-phospho)-1D-myo-inositol (glucosaminyl phosphatidylinositol, GlcN-PI) to generate a 2-acyl-6-alpha-D-glucosaminyl-1-(1,2-diacyl-sn-glycero-3-phospho)-1D-myo-inositol (glucosaminyl acyl phosphatidylinositol, GlcN-(acyl)PI) and participates in the fourth step of GPI-anchor biosynthesis (By similarity). Required for the transport of GPI

Endoplasmic reticulum membrane

Glycosylphosphatidylinositol biosynthesis defect 11

An autosomal recessive neurologic disorder characterized by developmental delay, intellectual disability, tonic seizures associated with hypsarrhythmia, dysmorphic facial features, and elevated serum alkaline phosphatase.