Oligopeptide
Definition
A relatively short chain of amino-acid residues linked by peptide bonds. The boundary between an oligopeptide and a longer polypeptide is convention-dependent.
By PurePeptideHub Editorial Team · Updated . Educational source review; independent clinical review pending.
Use the actual sequence when available
Oligo means few, but publications do not always apply a single residue-count cutoff. A report that gives the sequence and number of residues is more precise than the category alone. Structural modifications can also be relevant even when chain length is unchanged.
References: [1]
Example: length is only one feature
Two chains containing six residues are both short peptides. If their residue order differs, they are different molecules and may behave differently. The label oligopeptide does not identify a receptor, biological role, purity level or clinical use.
How it differs from neighboring terms
Dipeptide and tripeptide specify two and three residues respectively. Polypeptide is commonly used for longer chains, while protein often carries an additional functional and structural context. Avoid using an arbitrary size boundary to infer how easily a molecule is absorbed or how safe it is.