Disease-associated mutations cause premature oligomerization of myelin proteolipid protein in the endoplasmic reticulum

Eileithyia Swanton, Andrew Holland, Stephen High, Philip Woodman

Research output: Contribution to journalArticle

Abstract

Pelizaeus-Merzbacher disease (PMD) is a dysmyelinating disease caused by mutations, deletions, or duplications of the proteolipid protein (PLP) gene. Mutant forms of PLP are retained in the endoplasmic reticulum (ER), and the resulting accumulation of mutant protein is thought to be a direct cause of oligodendrocyte cell death, which is the primary clinical feature of PMD. The molecular mechanisms underlying the toxicity of mutant PLP are however currently unknown. We report here that PMD-linked mutations of PLP are associated with the accelerated assembly of the protein into stable homooligomers that resemble mature, native PLP. Thus although WT PLP forms stable oligomers after an extended maturation period, most likely at the cell surface, mutant forms of PLP rapidly assemble into such oligomers at the ER. Using PLP mutants associated with diseases of varying severity, we show that the formation of stable oligomers correlates with the development of PMD. Based on these findings, we propose that the premature oligomerization of PLP in the ER of oligodendrocytes contributes to the pathology of PMD.

Original languageEnglish (US)
Pages (from-to)4342-4347
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume102
Issue number12
DOIs
StatePublished - Mar 22 2005

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Keywords

  • Endoplasmic reticulum
  • Membrane protein
  • Oligomer
  • Pelizaeus-Merzbacher disease
  • Quality control

ASJC Scopus subject areas

  • General

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