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How to get a folded protein across a membrane
1Section of Microbiology, University of California, Davis, One Shields Ave, Davis, CA 95616, USA. sateter@ucdavis.edu
Trends in Cell Biology
|October 8, 1999
Summary
Researchers are uncovering mechanisms for transporting folded proteins across membranes. Key pathways include peroxisomal targeting, bacterial twin-arginine translocation (Tat), and plant/yeast pathways, advancing protein translocation understanding.
Area of Science:
- Cellular biology
- Molecular biology
- Biochemistry
Background:
- Protein transport across membranes is crucial for cellular function.
- Classical models focused on unfolded protein translocation.
- Recent discoveries reveal pathways accommodating folded protein transport.
Purpose of the Study:
- To review current knowledge on mechanisms of folded protein transport.
- To identify research gaps in understanding these pathways.
- To discuss the influence of classical translocation paradigms on current views.
Main Methods:
- Review of existing literature on protein translocation.
- Analysis of characterized pathways for folded protein transport.
- Comparative study of different cellular systems (bacteria, plants, yeast).
Main Results:
- Identification of three key pathways for folded protein transport: peroxisomal targeting, twin-arginine translocation (Tat), and cytoplasm-to-vacuole targeting (Cvt).
- These pathways accommodate folded and oligomerized proteins, challenging previous assumptions.
- Understanding the molecular basis of these transport mechanisms is an active area of research.
Conclusions:
- Multiple pathways exist for the translocation of folded proteins across membranes.
- Further research is needed to elucidate the molecular mechanisms involved.
- Existing paradigms of protein translocation require re-evaluation in light of these findings.