Abstract
Most of the endogenous opioids that have been identified are peptides that originate from four distinct precursor proteins, proenkephalin, prodynorphin, proopiomelanocortin (POMC), and pronociceptin/orphanin FQ. All four of these precursors are differentially processed by endopeptidases and carboxypeptidases to give rise to a large number of peptides that have biological activity. In many cases, the amount of processing affects the bioactivity of the resulting peptides; in some cases the longer forms of a particular peptide bind with higher affinity to one of the opioid peptide receptors, in other cases the shorter forms bind with higher affinity to the receptor. Also, in the case of β-endorphin, one form of the peptide is an agonist at opioid peptide receptors while a shorter form lacking four C-terminal residues is an antagonist at the same receptor. Thus, processing of the endogenous opioid peptides plays a critical role in generating the bioactive form(s) of the peptide, and regulation of this processing can greatly influence the physiological activity of the peptide.
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Berezniuk, I., Fricker, L.D. (2011). Endogenous Opioids. In: Pasternak, G. (eds) The Opiate Receptors. The Receptors. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-60761-993-2_5
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