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标题：Fatty Acyl-Co A : Sphingosine Acyltransferase in Bovine Brain Mitochondria : Its Solubilization and Reconstitution onto the Membrane Lipid Liposomes
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作者：Hiroshi SHIMENO ; Shinji SOEDA ; Masahiro YASUKOUCHI 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：1995
卷号：18
期号：10
页码：1335-1339
DOI：10.1248/bpb.18.1335
出版社：The Pharmaceutical Society of Japan
摘要：Fatty acyl-Co A : sphingosine acyltransferase (ceramide synthase, EC 2. 3. 1. 24) is mainly localized in the microsomal and mitochondrial membranes. Attempts to isolate the enzyme have failed, largely because there has been little or no detection of the enzyme activity in detergent extracts. In this study, we solubilized the membrane-bound enzyme from bovine brain mitochondria with a Tris-HCI buffer containing 2% Triton X-100 and, after removal of the detergent, reconstituted it with the membrane lipid liposomes. The specific activity of the reconstituted enzyme was approx. 8 times higher than that of the solubilized enzyme. We next examined the lipid dependence of the enzyme, using various phospholipid liposomes. The ability of phospholipids to enhance the activity of solubilized ceramide synthase was specific and structure-related. The most potent stimulator was phosphatidylserine liposomes, suggesting an important role of the net negative charges. This paper also describes a highly reproducible high-performance liquid chromatographic (HPLC) procedure for the determination of ceramide synthase activity. Combination of the HPLC method with the reconstituted enzyme system appears to be suitable for elucidating the characteristics of this enzyme.
关键词：ceramide synthase;solubilization;reconstitution;liposome;HPLC