Pentadecapeptide
A pentadecapeptide is a peptide composed of exactly 15 amino acid residues linked by 14 peptide bonds. The prefix "pentadeca-" derives from Greek for fifteen.
BPC-157 is the most widely studied pentadecapeptide in current research. Its 15-residue sequence (Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val) gives it a molecular weight of 1419.53 Da.
Peptides are classified by length: dipeptide (2), tripeptide (3), tetrapeptide (4), pentapeptide (5), and so on. Peptides up to approximately 50 residues are typically called peptides, while longer chains are classified as polypeptides or proteins. The 15-residue length of BPC-157 places it in the medium range for synthetic peptides.
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Related Terms
Amino Acid Sequence
The linear order of amino acid residues in a peptide or protein chain, written from N-terminus to C-terminus, which determines the molecule's identity and properties.
Peptide Bond
A covalent chemical bond formed between the carboxyl group of one amino acid and the amino group of another through a condensation reaction, linking amino acids into chains.
Polypeptide
A chain of amino acids linked by peptide bonds, typically referring to chains longer than ~20 residues but shorter than full proteins.
Molecular Weight
The sum of atomic weights of all atoms in a molecule, expressed in Daltons (Da). Used to identify peptides via mass spectrometry.
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