How are proteins imported into peroxisomes?
Understand the Problem
The question is asking about the mechanisms by which proteins are imported into peroxisomes, which are organelles in eukaryotic cells. It presents multiple choice answers related to different processes of protein import.
Answer
Peroxisomal proteins are imported by recognition, docking, translocation, and receptor recycling.
Peroxisomal proteins are imported by recognition in the cytosol by specific receptors, docking at the peroxisomal membrane, translocation into the matrix, and recycling of those receptors.
Answer for screen readers
Peroxisomal proteins are imported by recognition in the cytosol by specific receptors, docking at the peroxisomal membrane, translocation into the matrix, and recycling of those receptors.
More Information
Unlike mitochondria and chloroplasts, peroxisomes do not have their own DNA or ribosomes. Proteins are imported post-translationally, meaning they are fully synthesized before being transported into the peroxisome.
Tips
A common mistake is assuming that protein import mechanisms into peroxisomes are similar to other organelles such as mitochondria or chloroplasts, which have their own DNA.
Sources
- Matrix Protein Import - PMC - pmc.ncbi.nlm.nih.gov
- Peroxisome protein import: a complex journey - PMC - pmc.ncbi.nlm.nih.gov
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