Abstract
A substance that competes for opiate receptor binding has been isolated from calf brain and identified as two pentapeptides, H-Tyr-Gly-Gly-Phe-Met-OH (methionine enkephalin) and H-Tyr-Gly-Gly-Phe-Leu-OH (leucine enkephalin), with about four times more leucine enkephalin than methionine enkephalin. Sodium and manganese effects on opiate receptor interactions show that both peptides are agonists, whereas leucine enkephalin may be a "purer" agonist than methionine enkephalin.
Publication types
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Amino Acid Sequence
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Amino Acids / analysis
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Animals
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Binding, Competitive
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Brain Chemistry*
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Cattle
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Ligands
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Manganese / pharmacology
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Naloxone / metabolism
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Nerve Tissue Proteins / analysis
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Nerve Tissue Proteins / isolation & purification*
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Oligopeptides* / analysis
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Oligopeptides* / isolation & purification
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Oligopeptides* / metabolism
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Receptors, Drug* / drug effects
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Sodium / pharmacology
Substances
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Amino Acids
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Ligands
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Nerve Tissue Proteins
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Oligopeptides
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Receptors, Drug
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Naloxone
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Manganese
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Sodium