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Updated: Aug 20, 2026

Measuring Transcellular Interactions through Protein Aggregation in a Heterologous Cell System
Published on: May 22, 2020
Nogo-A, -B, and -C are found on the cell surface and interact together in many different cell types
Dana A Dodd1, Barbara Niederoest, Stefan Bloechlinger
1Brain Research Institute, University of Zürich and Department of Biology, ETH Zürich, CH-8057 Zürich, Switzerland. dodd@hifo.unizh.ch
Abstract:
Nogo-A, -B, and -C are generated from the Nogo/RTN-4 gene and share a highly conserved C-terminal domain. They lack an N-terminal signal sequence and are predominantly localized to the endoplasmic reticulum (ER). We found the N terminus of endogenous Nogo-A exposed on the surface of fibroblasts, DRG neurons, and myoblasts. Surface-expressed Nogo-A was also present on presynaptic terminals of the neuromuscular junction and on DRG neurons in vivo. Surface biotinylations confirmed the presence of all Nogo isoforms on the surface. To search for proteins that interact with Nogo-A and suggest a function for the large intracellular pool of Nogo-A, immunoprecipitations were performed. Surprisingly, the most predominant proteins that interact with Nogo-A are Nogo-B and Nogo-C as seen with radiolabeled lysates and as confirmed by Western blotting in multiple cell lines. Nogo-A, -B, and -C share a 180-amino acid C-terminal domain with two highly conserved hydrophobic stretches that could form a channel or transporter in the ER and/or on the cell surface.
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