Human Autoantibodies Against SRP54 Inhibit Protein Translocation
Author Information
Author(s): Römisch Karin, Miller Frederick W, Dobberstein Bernhard, High Stephen
Primary Institution: University of Cambridge
Hypothesis
The study investigates the effects of human autoantibodies against the 54 kDa protein of the signal recognition particle (SRP54) on its function in protein translocation.
Conclusion
The study found that anti-SRP54 autoantibodies inhibit the translocation of the secretory protein preprolactin into the endoplasmic reticulum.
Supporting Evidence
- Anti-SRP54 autoantibodies were shown to inhibit the translocation of preprolactin in a cell-free system.
- The binding of anti-SRP54 autoantibodies interfered with the signal-sequence binding to SRP54.
- Affinity-purified autoantibodies specific for the SRP54N domain did not inhibit signal-sequence binding, indicating a specific mechanism of inhibition.
Takeaway
Some people have antibodies that can stop proteins from getting into cells, which can cause health problems.
Methodology
The study used a cell-free system to analyze the effects of anti-SRP54 autoantibodies on protein translocation.
Participant Demographics
Patients with polymyositis were the source of the sera containing anti-SRP autoantibodies.
Digital Object Identifier (DOI)
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