Phosphatidylinositol-glycan biosynthesis class Z protein (PIGZ)

Phosphatidylinositol-glycan biosynthesis class Z protein (PIGZ) is an integral membrane glycosyltransferase involved in the stepwise assembly of the GPI anchor in the endoplasmic reticulum[3][6]. Specifically, it catalyzes the transfer of the fourth mannose residue (via an alpha-1,2 linkage) onto the GPI precursor, using dolichol-phosphate-mannose (Dol-P-Man) as the mannose donor[3][6]. The GPI anchor is an essential glycolipid modification that tethers a variety of proteins (GPI-anchored proteins) to the extracellular surface of the plasma membrane, playing key roles in cell signaling, adhesion, enzyme localization, and immune function[1][5][6]. PIGZ is part of a family of mannosyltransferases, sharing structural and mechanistic features with other enzymes in the GPI biosynthetic pathway[6]. Mutations affecting related steps in GPI-anchor biosynthesis are associated with rare congenital disorders of glycosylation that can have severe neurological and metabolic consequences[2].Direct information about drugs, mechanisms of action, or biomarker roles for PIGZ is not currently reported; its clinical significance centers on its enzymatic role in the biosynthetic pathway for GPI anchors and the resulting impact of its dysfunction on protein localization to the cell surface[2].

Other names

GPI alpha-1,2-mannosyltransferase 4GPI-MT-IVSMP3 homologGPI mannosyltransferase IVSMP3hSMP3FLJ12768MGC52163dol-P-Man dependent GPI mannosyltransferaseGPI mannosyltransferase 4SMP3 mannosyltransferasephosphatidylinositol-glycan biosynthesis class Z proteinSMP3 homolog (S. cerevisiae)