UNIT 12.12 Protein O-Mannosylation in Metazoan Organisms

  1. Vladislav M. Panin1,
  2. Lance Wells2

Published Online: 3 FEB 2014

DOI: 10.1002/0471140864.ps1212s75

Current Protocols in Protein Science

Current Protocols in Protein Science

How to Cite

Panin, V. M. and Wells, L. 2014. Protein O-Mannosylation in Metazoan Organisms. Current Protocols in Protein Science. 75:12.12:12.12.1–12.12.29.

Author Information

  1. 1

    Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas

  2. 2

    Complex Carbohydrate Research Center, Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia

Publication History

  1. Published Online: 3 FEB 2014


Protein O-mannosylation is a special type of glycosylation that plays prominent roles in metazoans, affecting development and physiology of the nervous system and muscles. A major biological effect of O-mannosylation involves the regulation of α-dystroglycan, a membrane glycoprotein mediating cell–extracellular matrix interactions. Genetic defects of O-mannosylation result in the loss of ligand-binding activity of α-dystroglycan and cause congenital muscular dystrophies termed dystroglycanopathies. Recent progress in mass spectrometry and in vitro analyses has shed new light on the mechanism of α-dystroglycan glycosylation; however, this mechanism is underlain by complex genetic and molecular elements that remain poorly understood. Protein O-mannosylation is evolutionarily conserved in metazoans, yet the pathway is simplified and more amenable to genetic analyses in invertebrate organisms, indicating that genetically tractable in vivo models could facilitate research in this area. This unit describes recent methodological strategies for studying protein O-mannosylation using in vitro and in vivo approaches. Curr. Protoc. Protein Sci. 75:12.12.1-12.12.29. © 2014 by John Wiley & Sons, Inc.


  • O-glycosylation;
  • O-mannose;
  • congenital muscular dystrophy;
  • dystroglycan;
  • Drosophila ;
  • mass spectrometry