Met-enkephalin

Met-enkephalin, also known as metenkefalin (INN), sometimes referred to as opioid growth factor (OGF), is a naturally occurring, endogenous opioid peptide that has opioid effects of a relatively short duration. It is one of the two forms of enkephalin, the other being leu-enkephalin. The enkephalins are considered to be the primary endogenous ligands of the δ-opioid receptor, due to their high potency and selectivity for the site over the other endogenous opioids.

Met-enkephalin
Names
IUPAC name
(2S)-2-[[(2S)-2-[[2-[[2-[[(2S)-2-amino-3-(4-hydroxyphenyl)propanoyl]amino]acetyl]amino]acetyl]amino]-3-phenylpropanoyl]amino]-4-methylsulfanylbutanoic acid
Other names
[Met]enkephalin; [Met5]enkephalin; L-Tyrosylglycylglycyl-L-phenylalanyl-L-methionine
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.055.741
EC Number
  • 261-335-8
KEGG
MeSH Enkephalin,+Methionine
UNII
  • InChI=1S/C27H35N5O7S/c1-40-12-11-21(27(38)39)32-26(37)22(14-17-5-3-2-4-6-17)31-24(35)16-29-23(34)15-30-25(36)20(28)13-18-7-9-19(33)10-8-18/h2-10,20-22,33H,11-16,28H2,1H3,(H,29,34)(H,30,36)(H,31,35)(H,32,37)(H,38,39) N
    Key: YFGBQHOOROIVKG-UHFFFAOYSA-N N
  • CSCCC(NC(=O)C(Cc1ccccc1)NC(=O)CNC(=O)CNC(=O)C(N)Cc1ccc(O)cc1)C(O)=O
  • CSCCC(NC(=O)C(CC1=CC=CC=C1)NC(=O)CNC(=O)CNC(=O)C(N)CC1=CC=C(O)C=C1)C(O)=O
Properties
C27H35N5O7S
Molar mass 573.67 g·mol−1
log P 0.607
Acidity (pKa) 3.234
Basicity (pKb) 10.763
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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