Detailed Explanation
A peptide with exactly 9 amino acid residues. The most famous nonapeptides are the structurally related hormones oxytocin (Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH₂) and vasopressin (Cys-Tyr-Phe-Gln-Asn-Cys-Pro-Arg-Gly-NH₂), which differ at only two positions (3 and 8) yet have dramatically different functions — oxytocin regulates bonding and reproduction while vasopressin controls water balance and blood pressure.
Both contain a disulfide bridge forming a 6-residue ring. Other notable nonapeptides include bradykinin (9 aa, vasodilation and pain) and desmopressin (synthetic vasopressin analog used to treat diabetes insipidus and bedwetting).
Key Facts
- A peptide with exactly 9 amino acid residues.
- The most famous nonapeptides are the structurally related hormones oxytocin (Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH₂) and vasopressin (Cys-Tyr-Phe-Gln-Asn-Cys-Pro-Arg-Gly-NH₂), which differ at only two positions (3 and 8) yet have dramatically different functions — oxytocin regulates bonding and reproduction while vasopressin controls water balance and blood pressure.
- Both contain a disulfide bridge forming a 6-residue ring.
- Other notable nonapeptides include bradykinin (9 aa, vasodilation and pain) and desmopressin (synthetic vasopressin analog used to treat diabetes insipidus and bedwetting).
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