Simantov R, Snyder S H
Proc Natl Acad Sci U S A. 1976 Jul;73(7):2515-9. doi: 10.1073/pnas.73.7.2515.
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.
一种能竞争阿片受体结合的物质已从小牛脑中分离出来,并被鉴定为两种五肽,即H-酪氨酰-甘氨酰-甘氨酰-苯丙氨酰-蛋氨酸-OH(甲硫氨酸脑啡肽)和H-酪氨酰-甘氨酰-甘氨酰-苯丙氨酰-亮氨酸-OH(亮氨酸脑啡肽),亮氨酸脑啡肽的含量约为甲硫氨酸脑啡肽的四倍。钠和锰对阿片受体相互作用的影响表明,这两种肽都是激动剂,而亮氨酸脑啡肽可能比甲硫氨酸脑啡肽是一种“更纯”的激动剂。