Partially glucose-capped oligosaccharides are found on the hemoglobins of the deep-sea tube worm Riftia pachyptila

Glycobiology. 1998 Jul;8(7):663-73. doi: 10.1093/glycob/8.7.663.


We report here the structural determination of N-linked oligosaccharides found on extracellular hemoglobins of the hydrothermal vent tube worm Riftia pachyptila. Structures were elucidated by a combination of electrospray ionization tandem mass spectrometry, matrix-assisted laser desorption/ionization mass spectrometry, normal-phase high performance liquid chromatography, and exoglycosidase digestion. The sugar chains were found to consist mainly of high-mannose-type glycans with some structures partially capped by one or two terminal glucose residues. The present study represents the first report of the occurrence of glucose capping of N-linked carbohydrates in a secreted glycoprotein of a metazoan. Previously, glucose capping has only been described for a membrane-bound surface glycoprotein from the unicellular parasite Leishmania mexicana amazonensis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Carbohydrate Conformation
  • Carbohydrate Sequence
  • Chromatography, High Pressure Liquid
  • Glucose / analysis*
  • Hemoglobins / chemistry*
  • Hemoglobins / isolation & purification
  • Leishmania mexicana
  • Mass Spectrometry
  • Membrane Glycoproteins / chemistry
  • Models, Molecular
  • Molecular Sequence Data
  • Oligosaccharides / chemistry*
  • Oligosaccharides / isolation & purification
  • Polychaeta
  • Protozoan Proteins / chemistry
  • Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization


  • Hemoglobins
  • Membrane Glycoproteins
  • Oligosaccharides
  • Protozoan Proteins
  • Glucose