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O-Linked glycosylation in Acanthamoeba polyphaga mimivirus

Andreas J Hülsmeier1, Thierry Hennet2

  • 1Institute of Physiology, University of Zurich, Winterthurerstrasse 190, Zurich 8057, Switzerland a.j.hulsmeier@access.uzh.ch.

Glycobiology
|May 6, 2014
PubMed

Insights

Mimivirus, a giant virus, synthesizes its own O-glycans, unlike other viruses that rely on hosts. Researchers identified 26 novel O-glycans, primarily glucose-based, revealing unique viral glycosylation mechanisms.

Area of Science:

  • Virology
  • Glycobiology
  • Biochemistry

Background:

  • Acanthamoeba polyphaga mimivirus is a giant virus with a large genome encoding cellular-like machinery.
  • Giant viruses, including Mimivirus, possess their own glycosylation systems, distinct from host-dependent mechanisms.
  • Understanding Mimivirus glycosylation is crucial for deciphering its unique biological processes.

Purpose of the Study:

  • To investigate the O-glycosylation of Mimivirus surface glycoproteins.
  • To characterize the novel O-glycans present in Mimivirus.
  • To develop a method for selective enrichment of Mimivirus glycoproteins.

Main Methods:

  • Development of a periodate oxidation-based method for glycoprotein enrichment.
  • Analysis of beta-eliminated glycans using permethylation.
  • Identification and sequencing of glycans via matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS).

Main Results:

  • Successfully enriched Mimivirus surface glycoproteins.
  • Identified O-glycosylation in Mimivirus glycoproteins.
  • Sequenced 26 novel O-glycans, with most containing glucose as the terminal sugar.

Conclusions:

  • Mimivirus possesses a unique and complex O-glycosylation system.
  • The identified O-glycans provide insights into Mimivirus's self-sufficiency in glycosylation.
  • These findings lay the groundwork for future research into the functional roles of Mimivirus glycosylation.
Keywords:
MALDI-mass spectrometrybeta-eliminationglycoprotein enrichmentmethylationreducing-end analysis

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