Wolfram syndrome‐associated mutations lead to instability and proteasomal degradation of wolframin
Copyright policy )Wolfram syndrome‐associated mutations lead to instability and proteasomal degradation of wolframin
Wolfram syndrome is caused by mutations in WFS1 encoding wolframin, a polytopic membrane protein of the endoplasmic reticulum. Here, we investigated the molecular pathomechanisms of four missense and two truncating mutations in WFS1. Expression in COS‐7 cells as well as direct analysis of patient cells revealed that WFS1 mutations lead to drastically reduced steady‐state levels of wolframin. All mutations resulted in highly unstable proteins which were delivered to proteasomal degradation. No wolframin aggregates were found in patient cells suggesting that Wolfram syndrome is not a disease of protein aggregation. Rather, WFS1 mutations cause loss‐of‐function by cellular depletion of wolframin.
- Institute of Diabetes Research Germany
- Helmholtz Zentrum München Germany
Proteasome Endopeptidase Complex, Wolfram syndrome, Mutation, Missense, Membrane Proteins, Wolfram Syndrome, Fibroblasts, WFS1, Wolframin, Mutation, COS Cells, Chlorocebus aethiops, Animals, Humans, Thermodynamics, RNA, Messenger, Protein Structure, Quaternary, Protein Processing, Post-Translational, Endoplasmic reticulum, Cells, Cultured
Proteasome Endopeptidase Complex, Wolfram syndrome, Mutation, Missense, Membrane Proteins, Wolfram Syndrome, Fibroblasts, WFS1, Wolframin, Mutation, COS Cells, Chlorocebus aethiops, Animals, Humans, Thermodynamics, RNA, Messenger, Protein Structure, Quaternary, Protein Processing, Post-Translational, Endoplasmic reticulum, Cells, Cultured
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