Identification of phosphatase that dephosphorylates xylose in the glycosaminoglycan-protein linkage region of proteoglycans.

ABSTRACT: Recently, we demonstrated that FAM20B is a kinase that phosphorylates the xylose (Xyl) residue in the glycosaminoglycan-protein linkage region of proteoglycans. The phosphorylation of Xyl residues by FAM20B enhances the formation of the linkage region. Rapid dephosphorylation is probably induced just after synthesis of the linker and just before polymerization initiates. Indeed, in vitro chondroitin or heparan sulfate polymerization does not occur when the Xyl residue of the tetrasaccharide linkage region is phosphorylated. However, the enzyme responsible for the dephosphorylation of Xyl remains unknown. Here, we identified a novel protein that dephosphorylates the Xyl residue and designated it 2-phosphoxylose phosphatase. The phosphatase efficiently removed the phosphate from the phosphor

SUBMITTER: Koike T 

PROVIDER: S-EPMC3945330 | biostudies-literature | 2014 Mar

REPOSITORIES: biostudies-literature