Solubilization and characterization of two rat brain membrane-bound aminopeptidases active on Met-enkephalin.

Solubilization and characterization of two rat brain membrane-bound aminopeptidases active on Met-enkephalin.
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两种对甲硫氨酸脑啡肽有活性的大鼠脑膜结合氨肽酶的溶解和表征。

DOI:
10.1021/bi00511a042
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发表时间:
1981
期刊:
影响因子:
2.9
通讯作者:
Hersh,LB
Hersh,LB
中科院分区:
生物学3区
文献类型:
--
作者:
Hersh,LB

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路易斯B。Hersh摘要:两个水解甲硫氨酸脑啡肽在Tyr-Gly键的氨肽酶已从大鼠脑细胞膜中溶解,并通过离子交换色谱分离。这些氨肽酶根据它们在离子交换色谱中洗脱的顺序命名为MI和MII。这两种氨肽酶可以在动力学上加以区分;氨肽酶MI水解L-精氨酸/3-萘酰胺的速度比L-丙氨酸(3-萘酰胺)快17倍,而氨肽酶MIL仅表现出1.7倍的差异。R.最近的研究表明,阿片肽Met-脑啡肽(Tyr-Gly-Gly-Phe-Met)和Leu-脑啡肽(Tyr-Gly-Gly-Phe-Leu)可作为神经递质(Freder-ickson,1977; Smith等,1976年)。由于神经递质通常在释放后不久即失活,因此最近的注意力集中在Met-和Leu-脑啡肽的失活机制上。三个机制,在-
Louis B. Hersh abstract: Two aminopeptidases which hydrolyze Met-enkephalin at the Tyr-Gly bond have been solubilized from rat brain membranes and resolved by ion-exchange chromatography. These aminopeptidases are designated MI and Mil based on the order in which they are eluted during ion-ex-change chromatography. The two aminopeptidases can be distinguished kinetically; aminopeptidase MI hydrolyzes L-arginine/3-naphthylamide 17 times faster than L-alanine (3-naphthylamide, while only a 1.7-fold difference is exhibited by aminopeptidase MIL Aminopeptidase Mil exhibits a higher affinity for aminoacid/3-naphthylamides, Met-enkephalin, Leu-enkephalin, and the inhibitor puromycin as com-! R. ecent studies suggest that the opioid peptides Met-enkephalin (Tyr-Gly-Gly-Phe-Met) and Leu-enkephalin (Tyr-Gly-Gly-Phe-Leu) may serve as neurotransmitters (Freder-ickson, 1977; Smith et al., 1976). Since neurotransmitters are generally inactivated shortly after they are released, recent attention has been focused on the mechanism of inactivation of Met-and Leu-enkephalin. Three mechanisms for the in-
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