Enzymes involved in glycerol phosphate-containing glycan biosynthesis

The enzymes involved in glycerol phosphate-containing glycan biosynthesis constitute a pathway responsible for the production and transfer of glycerol phosphate (GroP) to cellular glycopolymers. In mammals, this pathway is primarily mediated by phosphoethanolamine cytidylyltransferase 2 (PCYT2), which synthesizes the donor molecule cytidine 5'-diphosphate-glycerol (CDP-Gro), and the glycosyltransferases fukutin (FKTN) and fukutin-related protein (FKRP), which append GroP to the O-mannosyl glycan of alpha-dystroglycan [1, 10]. This modification serves as a biological terminator that caps glycans and prevents the elongation of functional matriglycans, thereby regulating cell-matrix adhesion [11, 14]. Dysregulation of this pathway is a critical factor in cancer malignancy and neuromuscular disease. In many cancers, the upregulation of PCYT2 and consequent GroP modification promotes metastasis by reducing the ability of cells to adhere to the basement membrane [1, 3]. In the context of alpha-dystroglycanopathy (a form of muscular dystrophy), GroP modification competes with the essential ribitol phosphate modification, further impairing muscle integrity [10, 15]. Additionally, in Gram-positive bacteria, these enzymes are vital for synthesizing teichoic acids, making them significant targets for antimicrobial development [11]. Pharmacological efforts include the use of meclizine to inhibit PCYT2 in cancer or the administration of exogenous ribitol to restore functional glycosylation in dystrophic models [6, 16].

Other names

Glycerol phosphate modification pathwayGroP-modifying enzymesPCYT2-FKTN-FKRP pathwayCDP-glycerol biosynthesis pathwayTeichoic acid biosynthesis enzymes