Signal Peptide
Signal Peptide — A short peptide sequence at the N-terminus of newly synthesized proteins that directs them to the secretory pathway for export from the cell.
What Is a Signal Peptide?
A signal peptide is a short (15-30 residue) N-terminal sequence that directs a newly synthesized protein to the secretory pathway for export from the cell. Signal peptides share a common architecture: a positively charged N-region, a hydrophobic core (h-region) of 7-15 leucine/alanine-rich residues, and a polar C-region containing the signal peptidase cleavage site.
Relevance to Peptide Research
- Recombinant production: Signal peptides are engineered into recombinant expression constructs to drive peptide secretion from host cells
- Precursor processing: All secreted peptide hormones (insulin, glucagon, oxytocin) are synthesized with signal peptides that are cleaved during maturation
- Prediction tools: SignalP algorithms predict signal peptide presence and cleavage sites from sequence data
Frequently Asked Questions
What is Signal Peptide?
A short peptide sequence at the N-terminus of newly synthesized proteins that directs them to the secretory pathway for export from the cell.
Why is Signal Peptide important in peptide research?
Signal Peptide is a fundamental concept in biochemistry as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.
Authority Sources
- Signal Peptide on Wikipedia
- Search Signal Peptide on PubChem (NIH)
- Research articles on ScienceDirect