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Acanthamoeba polyphaga mimivirus is a member of the giant nucleocytoplasmic large DNA viruses, infecting various Acanthamoeba spp. The genomes of giant viruses encode components previously thought to be exclusive to cellular life, such as proteins involved in nucleic acid and protein synthesis. Recent work on enzymes involved in carbohydrate biosynthesis and metabolism show that instead of utilizing host cell resources, Mimivirus produces its own glycosylation machinery. To obtain a more detailed view of glycosylation in Mimivirus, we developed a periodate oxidation-based method to selectively enrich Mimivirus surface glycoproteins. O-Glycosylation in Mimivirus glycoproteins was identified by permethylation and matrix-assisted laser desorption/ionization-mass spectrometry analyses of beta-eliminated glycans. We sequenced 26 previously undescribed O-glycans, most of which contain glucose as their reducing end saccharide. These data will facilitate future studies on the functional significance of glycosylation in Mimivirus.

O-Linked glycosylation in Acanthamoeba polyphaga mimivirus