Enkephalin
![]() Met-enkephalin 3D structure, alpha-carbons shown as balls and labeled by residue.[1]
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Identifiers | |
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Symbol | PENK |
Entrez | 5179 |
HUGO | 8831 |
OMIM | 131330 |
RefSeq | NM_006211 |
UniProt | P01210 |
Other data | |
Locus | Chr. 8 q23-q24 |
An enkephalin is a pentapeptide involved in regulating nociception in the body. The enkephalins are termed endogenous ligands, as they are internally derived and bind to the body's opioid receptors. Discovered in 1975, two forms of enkephalin were revealed, one containing leucine ("leu"), and the other containing methionine ("met"). Both are products of the proenkephalin gene.[2]
- Met-enkephalin is Tyr-Gly-Gly-Phe-Met.
- Leu-enkephalin has Tyr-Gly-Gly-Phe-Leu.
Contents
Endogenous opioid peptides
There are three well-characterized families of opioid peptides produced by the body: enkephalins, endorphins, and dynorphins. The met-enkephalin peptide sequence is coded for by the enkephalin gene; the leu-enkephalin peptide sequence is coded for by both the enkephalin gene and the dynorphin gene.[3] The proopiomelanocortin gene (POMC) also contains the met-enkephalin sequence on the N-terminus of beta-endorphin, but the endorphin peptide is not processed into enkephalin.
Enkephalin receptor
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The receptors for enkephalin are the delta opioid receptors. Opioid receptors are a group of G-protein-coupled receptors, with other opioids as ligands as well. The other endogenous opioids are dynorphins (that bind to kappa receptors), endorphins (mu receptors), endomorphins, and nociceptin/orphanin FQ. The opioid receptors are ~40% identical to somatostatin receptors (SSTRs).
See also
References
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External links
- Enkephalins at the US National Library of Medicine Medical Subject Headings (MeSH)
- Physiology: 6/6ch2/s6ch2_36 - Essentials of Human Physiology
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- ↑ PDB: 1plx; Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Opioid peptides: Molecular pharmacology, biosynthesis and analysis, R.S. Rapaka and R. L. Hawks (editors) in a National Institute on Drug Abuse Research Monograph (#70), 1986.