Other · Endogenous opioid peptide fragment; POMC-derived peptide
Gamma-endorphin
Also known as γ-Endorphin; Beta-endorphin (1–17)
A 17-residue beta-endorphin fragment used in opioid structure–activity studies and investigations of endorphin metabolism.
- Length
- 17 amino acids
- Half-life
- Not well characterised
- Mechanism
- Gamma-endorphin retains beta-endorphin's N-terminal opioid recognition sequence and can engage opioid receptors. Historical behavioural findings also prompted investigations of non-opioid processes, but those observations do not establish a single alternative receptor target.
- Studied in
- Peptide-processing assays, opioid receptor preparations and rodent behavioural models investigate gamma-endorphin and distinguish its activity from that of its des-tyrosine fragment.
About Gamma-endorphin
Gamma-endorphin corresponds to residues 1–17 of beta-endorphin, with the sequence Tyr-Gly-Gly-Phe-Met-Thr-Ser-Glu-Lys-Ser-Gln-Thr-Pro-Leu-Val-Thr-Leu. Like alpha-endorphin, it belongs to the family of fragments associated with processing of POMC-derived beta-endorphin. The two peptides differ only by gamma-endorphin's terminal leucine. Early endorphin research examined these shorter sequences to explore whether opioid activity and behavioural effects tracked together as the parent peptide was shortened, providing a foundation for subsequent structure–activity investigations.
A key distinction is between intact gamma-endorphin and des-tyrosine gamma-endorphin, which lacks the first residue. Removing the N-terminal tyrosine strongly changes classical opioid recognition; findings for the des-tyrosine fragment should therefore not be assigned to gamma-endorphin itself. Laboratory studies can pair analytical monitoring of peptide cleavage with receptor binding or cellular signalling measurements. Historical descriptions of behavioural activity are best interpreted as model-specific observations, not proof of a well-defined non-opioid receptor mechanism.
Laboratory notes
- Confirm retention of the N-terminal tyrosine; des-tyrosine gamma-endorphin is a separate research compound.
- Use LC–MS time-course checks in protease-containing matrices to distinguish parent-peptide activity from fragment formation.
- Record terminal chemistry and peptide purity when comparing gamma-endorphin with alpha-endorphin or beta-endorphin.
Storage and reconstitution basics: storage guide.
Questions about Gamma-endorphin
Is gamma-endorphin the same as des-tyrosine gamma-endorphin?
No. Gamma-endorphin contains 17 residues, whereas the des-tyrosine fragment lacks the N-terminal tyrosine and contains 16.
Does gamma-endorphin have an established non-opioid receptor?
No single alternative receptor target is firmly established. Historical behavioural observations alone cannot identify a molecular receptor.
Why measure degradation during an assay?
Cleavage can generate fragments with different receptor activity. Measuring peptide integrity helps determine whether a readout reflects gamma-endorphin or its breakdown products.
Is Gamma-endorphin for human use?
No. It is supplied strictly for in-vitro laboratory research and is not for human or animal consumption.
Related research peptides
All products are sold for laboratory research use only. Not for human consumption, not a medicine, not for diagnosing, treating or preventing any condition.