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Implication of the Extracellular Disulfide Bond on Myelin Protein Zero Expression

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Abstract

Mutations in myelin protein zero (P0) are responsible for several peripheral neuropathies. We studied transport and membrane integration of the truncated P0 mutants using transfected oligodendroglial cell line (Oln93). Starting with rat cDNA, we produced two P0 deletions. The first, called P0-Tyr contains a 66 amino acid deletion in the extracellular domain and a tyrosine at the new position 32. In the second, called P0-Cys, the tyrosine 32 is replaced by a cysteine. This replacement restores a disulfide bond in the extracellular domain. Our results show that P0 proteins, truncated or not, were expressed in the plasma membrane of the transfected cells. Transcription rates of both mutants were normal. However, P0-Tyr was detected in only 3-5% of the cells compared to the P0-Cys and the wild type. Thus, the disulfide bond in the extracellular domain is important for stability and correct addressing of the P0 protein.

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Authors and Affiliations

  1. Laboratory of Neurochemistry, Department of Pediatrics, CHUV, Lausanne, Switzerland

    Gilles Pfend, Jean-Marie Matthieu & Mirjana Tosic

  2. Institute of Cell Biology and Morphology, University of Lausanne, Switzerland

    Nathalie Garin

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  1. Gilles Pfend
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Pfend, G., Matthieu, JM., Garin, N. et al. Implication of the Extracellular Disulfide Bond on Myelin Protein Zero Expression. Neurochem Res 26, 503–510 (2001). https://doi.org/10.1023/A:1010908828134

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