Oligodendrocyte transmembrane protein: a novel member of the glutamate-binding protein subfamily

Biochem Biophys Res Commun. 2001 May 18;283(4):900-7. doi: 10.1006/bbrc.2001.4859.

Abstract

Oligodendrocytes (OLGs) are cells from the central nervous system that synthesize, assemble, and maintain myelin, the multilamellar membrane that surrounds axons and facilitates the fast conduction of nerve impulses. We have shown that OLGs initiate their myelinogenic phenotype upon adhesion to GRASP, a heparin-binding glycoprotein that we purified from horse serum. In an attempt to identify the genes implicated in establishing this phenotype, we isolated a novel 3500 bp cDNA related to, but distinct from, a subfamily of glutamate-binding proteins (GBP). The cDNA encodes a protein of 511 amino acids, whose predicted sequence can be modeled as a tetrahelical integral protein with a large external loop and with the N- and C-termini located inside the cell. We have named this protein oligodendrocyte transmembrane protein (OTMP). Transcription of the message is induced upon OLG acquiring a myelinogenic phenotype (i.e., upon adhesion). The temporal expression in conjunction with the structural and biochemical features of OTMP is suggestive of a signaling receptor with a role in myelinogenesis.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Carrier Proteins / chemistry
  • Carrier Proteins / genetics*
  • Carrier Proteins / metabolism
  • Cloning, Molecular
  • DNA, Complementary
  • Glutamates / metabolism*
  • Membrane Proteins / chemistry
  • Membrane Proteins / genetics*
  • Membrane Proteins / metabolism
  • Molecular Sequence Data
  • Myelin Proteins / biosynthesis
  • Oligodendroglia / metabolism*
  • RNA, Messenger / genetics
  • Sequence Homology, Amino Acid
  • Sheep

Substances

  • Carrier Proteins
  • DNA, Complementary
  • Glutamates
  • Membrane Proteins
  • Myelin Proteins
  • OTMP protein, Ovis aries
  • RNA, Messenger