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Related Experiment Videos

Distinction between processing of normal and mutant complement C3 within human skin fibroblasts.

Z Fishelson1, E Kozer, S Sirhan

  • 1Department of Cell Biology and Histology, Sackler School of Medicine, Tel Aviv University, Israel. lifish@post.tau.ac.il

European Journal of Immunology
|March 26, 1999
PubMed
Summary

Type II C3 deficiency involves abnormal C3 protein retention in the endoplasmic reticulum (ER). This leads to intracellular degradation via a two-step process, impacting complement system function.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Inherited C3 deficiency can arise from gene mutations affecting C3 production (Type I).
  • A distinct Type II C3 deficiency involves a mutation causing abnormal, non-secreted C3 protein.

Purpose of the Study:

  • To investigate the post-translational processing and cellular fate of mutant C3 in Type II deficiency.
  • To elucidate the degradation pathway of abnormal C3 protein.

Main Methods:

  • Analysis of C3 processing in fibroblasts from skin biopsies.
  • Utilizing temperature shifts (19°C) and ATP depletion to study protein processing.
  • Investigating degradation pathways using NH4Cl treatment.

Main Results:

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  • Mutant C3 accumulates in the endoplasmic reticulum (ER), unlike normal C3 distributed in the cytoplasm.
  • Most mutant C3 undergoes intracellular degradation, with minimal secretion (approx. 8%).
  • Processing is blocked at low temperatures and involves both ATP-independent and ATP-dependent degradation steps, distinct from lysosomal pathways.

Conclusions:

  • Type II mutant C3 is retained in the ER due to quality control mechanisms recognizing misfolded proteins.
  • The abnormal C3 protein is targeted for a sequential intracellular degradation process.
  • This ER retention and degradation pathway contributes to C3 deficiency and impacts complement function.