Identification of a satellite fatty acid ethyl ester synthase from human myocardium as a glutathione S-transferase.

Identification of a satellite fatty acid ethyl ester synthase from human myocardium as a glutathione S-transferase.
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鉴定来自人心肌的卫星脂肪酸乙酯合酶为谷胱甘肽 S-转移酶。

DOI:
10.1172/jci114382
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发表时间:
1989
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Lange,LG
Lange,LG
中科院分区:
--
文献类型:
--
作者:
Bora,PS;Spilburg,CA;Lange,LG

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脂肪酸乙酯(FAEE)合成酶催化的非氧化酒精代谢可能导致酒精滥用引起的肝外损伤。与兔心肌FAEE合成酶不同,来自人心脏的FAEE合成酶有一个卫星次级合成酶(I),从DEAE纤维素中以5 ms的电导率洗脱,通过顺序凝胶渗透、疏水相互作用和Superose-12快速蛋白液相色谱,合成酶I被纯化了1118倍,达到均匀性。SDS-PAGE分析显示该酶的分子量为26 kD,凝胶渗透色谱分析显示该酶的分子量为52 kD。均相合成酶I以最高速率催化不饱和十八烷脂肪酸底物合成乙酯。合成酶I的氨基酸组成与人类心肌主要合成酶高度同源,最近被鉴定为酸性谷胱甘肽(GSH) s -转移酶。在DEAE纤维素、Sephadex G-100和s-己基谷胱甘肽琼脂糖上,FAEE合成酶与谷胱甘肽s-转移酶共层析,也显示出谷胱甘肽s-转移酶催化谷胱甘肽与含硝基苯致癌物偶联的活性。因此,人心肌含有FAEE合酶活性的卫星峰,它是一种中性的谷胱甘肽s转移酶。图片
Nonoxidative alcohol metabolism catalyzed by fatty acid ethyl ester (FAEE) synthases may contribute to extrahepatic injury resulting from alcohol abuse. Unlike rabbit myocardial FAEE synthase, that from human heart has a satellite minor synthase (I) eluting from DEAE cellulose at a conductivity of 5 mS. Synthase I was purified 1,118-fold to homogeneity by sequential gel permeation, hydrophobic interaction, and Superose-12 fast-protein liquid chromatographies. SDS-PAGE showed a single polypeptide with a molecular mass of 26 kD and gel permeation chromatography indicated a molecular mass of 52 kD for the active enzyme. Homogeneous synthase I catalyzed ethyl ester synthesis at highest rates with unsaturated octadecanoic fatty acid substrates. The amino acid composition of synthase I was highly homologous to that of human myocardial major synthase, recently identified as an acidic glutathione (GSH) S-transferase. Antibody raised against homogeneous human heart major synthase cross-reacted with the 26-kD synthase I. FAEE synthase co-chromatographed with GSH S-transferase on DEAE cellulose, Sephadex G-100 and S-hexylglutathione agarose, and also displayed GSH S-transferase activity in catalyzing the conjugation of GSH with nitrobenzene-containing carcinogens. Thus, human myocardium contains a satellite peak of FAEE synthase activity and it is a neutral GSH S-transferase.Images
DOI: 10.1016/s0021-9258(17)39074-9
发表时间: 1985
期刊: The Journal of biological chemistry
影响因子: --
作者:
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DOI: 10.1016/0014-5793(84)80309-9
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