首页> 外文期刊>Biochimica et biophysica acta: international journal of biochemistry and biophysics >Molecular cloning, functional expression and tissue distribution of rat acyl-coenzyme A:cholesterol acyltransferase.
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Molecular cloning, functional expression and tissue distribution of rat acyl-coenzyme A:cholesterol acyltransferase.

机译:大鼠酰基辅酶A:胆固醇酰基转移酶的分子克隆,功能表达和组织分布

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Acyl-coenzyme A:cholesterol acyltransferase (ACAT) is an enzyme catalyzing the intracellular formation of cholesteryl esters from free cholesterol and fatty acyl-CoA. In the present study, we cloned rat ACAT cDNA and determined its tissue distribution. Rat ACAT cDNA, having a coding region of 1635 bp with its deduced protein sequence of 545 amino acids and two typical motifs such as signature sequences and leucine heptad motif, showed 83, 92 and 90% identity with human, mouse, and hamster ACAT, respectively. Expression of rat ACAT cDNA in A293 cells and CHO cells resulted in a 3.0 to 3.5-fold increase in the enzyme activity. Among twelve tissues examined, ACAT activity was highest in adrenal followed by liver and intestine while that of aorta was extremely low. The mRNA level was also the highest in adrenal among four tissues examined. However, in contrast to its high ACAT activity, the liver mRNA level was extremely low (adrenal intestine > aorta liver). Consistent with mRNA levels, immunohistochemical analyses with a specific ACAT antibody detected significant ACAT signals in adrenal and intestine but a negligible signal in liver. These results indicate that adrenal most abundantly expresses ACAT in rat. Furthermore, rat liver showed a high ACAT activity but an extremely low ACAT mRNA and negligible immunohistochemical reactivity, suggesting the presence of a structurally different ACAT protein(s) in rat liver. Copyright 1998 Elsevier Science B.V.
机译:酰基辅酶A:胆固醇酰基转移酶(ACAT)是一种催化游离胆固醇和脂肪酰基辅酶A形成胆固醇酯的细胞内形成的酶。在本研究中,我们克隆了大鼠ACAT cDNA,并确定了其组织分布。大鼠ACAT cDNA的编码区为1635 bp,推导的蛋白质序列为545个氨基酸,并具有两个典型基序,例如签名序列和亮氨酸七肽基序,与人,小鼠和仓鼠ACAT的同源性分别为83%,92%和90%,分别。大鼠ACAT cDNA在A293细胞和CHO细胞中的表达导致酶活性增加了3.0到3.5倍。在所检查的十二种组织中,肾上腺的ACAT活性最高,其次是肝和肠,而主动脉的ACAT活性则极低。在所检查的四个组织中,肾上腺的mRNA水平也最高。然而,与其高的ACAT活性相反,肝脏的mRNA水平极低(肾上腺肠道>主动脉肝脏)。与mRNA水平一致,使用特定ACAT抗体的免疫组织化学分析在肾上腺和肠中检测到显着的ACAT信号,但在肝脏中检测到的信号可忽略不计。这些结果表明肾上腺在大鼠中最丰富地表达ACAT。此外,大鼠肝脏显示出高的ACAT活性,但是具有极低的ACAT mRNA和极低的免疫组化反应性,表明大鼠肝脏中存在结构上不同的ACAT蛋白。版权所有1998 Elsevier Science B.V.

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