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Enkephalin

 

 
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Enkephalin
 
 
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An enkephalin is a pentapeptide involved in regulating pain
Pain

Pain, in the sense of physical pain, is a typical sensory experience that may be described as the unpleasant awareness of a noxious stimulus or bodily harm....
 and nociception
Nociception

Nociception is defined as "the neural processes of encoding and processing noxious stimuli." It is the afferent activity produced in the peripheral and central nervous system by stimuli that have the potential to damage tissue....
 in the body. The enkephalins are termed endogenous ligand
Ligand

In chemistry, a ligand is either an atom, ion, or molecule that bonds to a central metal, generally involving formal donation of one or more of its electrons....
s, or specifically endorphin
Endorphin

Endorphins are endogenous opioid polypeptide compounds. They are produced by the pituitary gland and the hypothalamus in vertebrates during strenuous exercise, excitement, pain, and orgasm, and they resemble the opiates in their abilities to produce analgesia and a sense of well-being....
s, 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
Leucine

Leucine is an a-amino acid with the chemical formula HO2CCHCH2CH2. It is an essential amino acid, which means that humans cannot synthesise it....
 ("leu"), while the other contains methionine
Methionine

Methionine is an a-amino acid with the chemical formula HO2CCHCH2CH2SCH3. This Essential amino acid is classified as nonpolar....
 ("met"). Both are products of the proenkephalin gene.



e are three well-characterized families of opioid peptides produced by the body
Opioid peptide

Opioid Peptides are short sequences of amino acids which mimic the effect of opiates in the brain. Opioid peptides may be produced by the body itself, for example endorphins, or be absorbed from partially digestion food ....
: enkephalins, endorphins and dynorphins.






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An enkephalin is a pentapeptide involved in regulating pain
Pain

Pain, in the sense of physical pain, is a typical sensory experience that may be described as the unpleasant awareness of a noxious stimulus or bodily harm....
 and nociception
Nociception

Nociception is defined as "the neural processes of encoding and processing noxious stimuli." It is the afferent activity produced in the peripheral and central nervous system by stimuli that have the potential to damage tissue....
 in the body. The enkephalins are termed endogenous ligand
Ligand

In chemistry, a ligand is either an atom, ion, or molecule that bonds to a central metal, generally involving formal donation of one or more of its electrons....
s, or specifically endorphin
Endorphin

Endorphins are endogenous opioid polypeptide compounds. They are produced by the pituitary gland and the hypothalamus in vertebrates during strenuous exercise, excitement, pain, and orgasm, and they resemble the opiates in their abilities to produce analgesia and a sense of well-being....
s, 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
Leucine

Leucine is an a-amino acid with the chemical formula HO2CCHCH2CH2. It is an essential amino acid, which means that humans cannot synthesise it....
 ("leu"), while the other contains methionine
Methionine

Methionine is an a-amino acid with the chemical formula HO2CCHCH2CH2SCH3. This Essential amino acid is classified as nonpolar....
 ("met"). Both are products of the proenkephalin gene.

  • Met-enkephalin
    Met-enkephalin

    Met-enkephalin is an endogenous opioid peptide neurotransmitter found naturally in the brains of many animals, including humans. It is one of the two forms of enkephalin; the other is leu-enkephalin....
     is Tyr-Gly-Gly-Phe-Met.
  • Leu-enkephalin
    Leu-enkephalin

    Leu-enkephalin is an endogenous opioid peptide neurotransmitter found naturally in the brains of many animals, including humans. It is one of the two forms of enkephalin; the other is met-enkephalin....
     has Tyr-Gly-Gly-Phe-Leu.


Endogenous opioid peptides

There are three well-characterized families of opioid peptides produced by the body
Opioid peptide

Opioid Peptides are short sequences of amino acids which mimic the effect of opiates in the brain. Opioid peptides may be produced by the body itself, for example endorphins, or be absorbed from partially digestion food ....
: enkephalins, endorphins and dynorphins. The met-enkephalin peptide sequence is coded for by both the enkephalin gene and the endorphin gene (also known as the POMC gene) and that the leu-enkephalin peptide sequence is coded for by both the enkephalin gene and the dynorphin gene.

Enkephalin receptor

The receptors for enkephalin are the opioid receptor
Opioid receptor

Opioid receptors are a group of G-protein coupled receptors with opioids as ligands. The endogenous opioids are dynorphins, enkephalins, endorphins, endomorphins and nociceptin....
s. These are a group of G-protein coupled receptors, with other opioid
Opioid

An opioid is a chemical substance that has a morphine-like action in the body. The main use is for analgesia. These agents work by binding to opioid receptors, which are found principally in the central nervous system and the gastrointestinal tract....
s as ligand
Ligand

In chemistry, a ligand is either an atom, ion, or molecule that bonds to a central metal, generally involving formal donation of one or more of its electrons....
s as well. The other endogenous
Endogenous

The word endogenous means "arising from within", the opposite of exogenous....
 opioids are dynorphin
Dynorphin

Dynorphins are a class of opioid peptides that arise from the precursor protein prodynorphin. When prodynorphin is cleaved during processing by proprotein convertase 2 , multiple active peptides are released: dynorphin A, dynorphin B, and a/?-neo-endorphin....
s, endorphin
Endorphin

Endorphins are endogenous opioid polypeptide compounds. They are produced by the pituitary gland and the hypothalamus in vertebrates during strenuous exercise, excitement, pain, and orgasm, and they resemble the opiates in their abilities to produce analgesia and a sense of well-being....
s, endomorphins and nociceptin/orphanin FQ. The opioid receptors are ~40% identical to somatostatin
Somatostatin

Somatostatin is a peptide hormone that regulates the endocrine system and affects neurotransmission and cell proliferation via interaction with G-protein-coupled somatostatin receptors and inhibition of the release of numerous secondary hormones....
 receptor
Receptor (biochemistry)

In biochemistry, a receptor is a protein molecule, embedded in either the plasma membrane or cytoplasm of a cell, to which a mobile signaling molecule may attach....
s (SSTRs).

See also

  • Endorphin
    Endorphin

    Endorphins are endogenous opioid polypeptide compounds. They are produced by the pituitary gland and the hypothalamus in vertebrates during strenuous exercise, excitement, pain, and orgasm, and they resemble the opiates in their abilities to produce analgesia and a sense of well-being....
  • Opioid peptide
    Opioid peptide

    Opioid Peptides are short sequences of amino acids which mimic the effect of opiates in the brain. Opioid peptides may be produced by the body itself, for example endorphins, or be absorbed from partially digestion food ....
  • Racecadotril
    Racecadotril

    Racecadotril is an antidiarrheal drug which acts as a peripherally acting enkephalinase inhibitor. Unlike other medications used to treat diarrhea, which Antipropulsive, racecadotril has an wikt:antisecretory effect?it reduces the secretion of water and electrolytes into the intestine....
  • RB-101
    RB-101

    RB-101 is a drug that acts as an enkephalinase inhibitor, which is used in scientific research.RB-101 acts by blocking both types of the the zinc-metallopeptidase enzymes known as enkephalinases, thus inhibiting the breakdown of the endogenous opioid peptides known as enkephalins....


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