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Partial purification and characterization of dolichol phosphate mannose synthase from Entamoeba histolytica


Partial purification and characterization of dolichol phosphate mannose synthase from Entamoeba histolytica



Glycobiology 10(12): 1311-1316



ISSN/ISBN: 0959-6658

PMID: 11159922

DOI: 10.1093/glycob/10.12.1311

Dolichol phosphate mannose synthase, an essential enzyme in glycoprotein biosynthesis, was partially purified from E.histolytica by hydrophobic interaction and affinity chromatography with octyl Sepharose CL-4B and Affi-Gel 501, respectively. Reducing agents, particularly dithiothreitol, positively influenced enzyme activity and stability, indicating a role of sulfhydryl groups on the transferase function. Activity did not depend on phospholipids; however, it was significantly stimulated by phosphatidylethanolamine and to a lower extent by other common phospholipids. Mixtures consisting of activating phospholipids did not exert an additive effect. In vitro phosphorylation with a cAMP-dependent protein kinase resulted in enzyme activation. This alteration was not associated with a change in the K(m) for the substrate but rather with a 2.6-fold increase in V(max). Phosphorylation in the presence of [gamma-(32)P]ATP resulted in strong labeling of two polypeptides, one of which exhibited the molecular mass reported for the enzyme from other organisms. Whether phosphorylation functions in vivo as a mechanism of regulation of dolichol phosphate mannose synthesis in E.histolytica remains to be determined.

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Accession: 046921528

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