Functional Topography of the Myelin‐associated Glycoprotein. I. Mapping of Domains by Electron Microscopy

Thomas Fahrig, Rainer Probstmeier, Eberhard Spiess, Anke Meyer‐Franke, Frank Kirchhoff, Bernd Drescher, Melitta Schachner

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The functional topography of the myelin‐associated glycoprotein (MAG) was investigated by electron microscopic analysis of rotary‐shadowed molecules of a MAG fragment (MAG 90) comprising the five immunoglobulin‐like domains of the extracellular part of the molecule. MAG 90 molecules appeared as rod‐like structures (18.5±1.2 nm long and 4.0±0.8 nm wide) with a globular domain at one end. Antibodies directed against the amino‐ and carboxy‐terminus of MAG 90 interacted with the non‐globular terminal region, indicating that the molecule is bent in the globular region with the amino‐ and carboxy‐terminal arms in close apposition to each other. An antibody which interferes with the binding of MAG to neurons interacted predominantly with the globular domain of MAG 90. The fibril‐forming collagen types I, III and V bound mainly to the non‐globular terminal region of MAG 90, whereas the majority of heparin molecules interacted with the globular region of the molecule. The L2/HNK‐1 carbohydrate structure was localized at the non‐globular region in the protein fragment comprising the fourth and fifth immunoglobulin‐like domains.

Original languageEnglish (US)
Pages (from-to)1118-1126
Number of pages9
JournalEuropean Journal of Neuroscience
Volume5
Issue number9
DOIs
StatePublished - Sep 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)

Keywords

  • L2/HNK‐1 carbohydrate
  • collagen
  • heparin
  • myelin‐associated glycoprotein

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