Detailed Explanation
Short N-terminal sequence (typically 15–30 residues) that acts as a molecular address label, directing a newly synthesized peptide to the correct cellular compartment. Signal peptides are recognized by the signal recognition particle (SRP), which docks the ribosome at the endoplasmic reticulum (ER) membrane, threading the growing peptide chain into the ER lumen.
Once delivery is complete, the signal peptide is cleaved by signal peptidase. Signal peptides share common features: a positively charged n-region, a hydrophobic h-region (core), and a polar c-region containing the cleavage site. Prediction tools like SignalP identify signal peptides from amino acid sequences with >95% accuracy.
Key Facts
- Short N-terminal sequence (typically 15–30 residues) that acts as a molecular address label, directing a newly synthesized peptide to the correct cellular compartment.
- Signal peptides are recognized by the signal recognition particle (SRP), which docks the ribosome at the endoplasmic reticulum (ER) membrane, threading the growing peptide chain into the ER lumen.
- Once delivery is complete, the signal peptide is cleaved by signal peptidase.
- Signal peptides share common features: a positively charged n-region, a hydrophobic h-region (core), and a polar c-region containing the cleavage site.
- Prediction tools like SignalP identify signal peptides from amino acid sequences with >95% accuracy.
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PeptideDefinition.com provides educational content about peptide science. Not medical advice. Consult a licensed healthcare provider for medical decisions.