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Peptide E (a 25-amino acid peptide derived from proenkephalin A) and β-endorphin (a 31-amino acid peptide derived from proopiomelanocortin) bind with high affinity to opioid receptors and share structural similarities but induce analgesic effects of very different intensity. Indeed, whereas they possess the same N-terminus Met-enkephalin message sequence linked to a helix by a flexible spacer and...
Peptide E is a 25-amino acid peptide derived from proenkephalin A that was originally isolated from the bovine adrenal medulla. Bovine peptide E (BPE), which possesses a Met- and a Leu-enkephalin sequence at its N- and C-terminus, respectively, has been described as a highly potent and selective μ-opioid receptor agonist. Paradoxically, the frog counterpart of peptide E (FPE), which exhibits only...
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