The optional long 5'-untranslated region of human ACAT1 mRNAs impairs the production of ACAT1 protein by promoting its mRNA decay.

The optional long 5'-untranslated region of human ACAT1 mRNAs impairs the production of ACAT1 protein by promoting its mRNA decay.
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人 ACAT1 mRNA 的可选长 5'-非翻译区通过促进其 mRNA 衰减来损害 ACAT1 蛋白的产生。

DOI:
10.1093/abbs/gmn004
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发表时间:
2009
影响因子:
3.7
通讯作者:
--
中科院分区:
生物学3区
文献类型:
--
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我们之前报道过,人类 ACAT1 mRNA 使用 AUG(11397-1399) 起始密码子产生 50 kDa 蛋白质,并使用上游框内 GGC(1274-1276) 起始密码子产生较小的 56 kDa 亚型。 GGC(1274-1276) 密码子位于 mRNA 可选的长 5'-非翻译区(5'-UTR,nt 1-1396)。与该 5'-UTR 相对应的 DNA 序列位于两个不同的染色体 7 和 1 中。在当前的工作中,我们报道了可选的长 5'-UTR 显着损害了从 AUG(1397-1399) 密码子起始的人 ACAT1 蛋白的产生,主要是通过促进其 mRNA 衰减。蛋白质印迹分析表明,可选的长 5'-UTR 有效损害了从 AUG(1397-1399) 密码子起始的不同蛋白质的产生,这意味着这种损害作用不受 3'-UTR 或 ACAT1 mRNA 编码序列的影响。逆转录定量聚合酶链式反应的结果表明,该5'-UTR显着降低了其连接的mRNA的含量。蛋白质与 mRNA 比率的分析表明,该 5'-UTR 主要降低其 mRNA 稳定性,而不是改变其翻译效率。接下来我们进行了质粒转染实验并使用放线菌素 D 抑制转录。结果表明,这个5'-UTR促进了其mRNA的衰变。使用体外制备的 RNA 进行的其他转染和核转染实验表明,在细胞的细胞质和细胞核中,可选的长 5'-UTR 连接的 mRNA 比没有连接的 mRNA 衰减得更快。总的来说,我们的研究为转录后水平的人类 ACAT1 基因表达调控带来了新的见解。
We have previously reported that human ACAT1 mRNAs produce the 50 kDa protein using the AUG(11397-1399) initiation codon, and also a minor 56 kDa isoform using the upstream in-frame GGC(1274-1276) initiation codon. The GGC(1274-1276) codon is located at the optional long 5'-untranslated region (5'-UTR, nt 1-1396) of the mRNAs. The DNA sequences corresponding to this 5'-UTR are located in two different chromosomes, 7 and 1. In the current work, we report that the optional long 5'-UTR significantly impairs the production of human ACAT1 protein initiated from the AUG(1397-1399)codon, mainly by promoting its mRNA decay. The western blot analyses indicated that the optional long 5'-UTR potently impaired the production of different proteins initiated from the AUG(1397-1399) codon, meaning that this impairing effect was not influenced by the 3'-UTR or the coding sequence of ACAT1 mRNA. The results of reverse transcription-quantitative polymerase chain reaction demonstrated that this 5'- UTR dramatically reduced the contents of its linked mRNAs. Analyses of the protein to mRNA ratios showed that this 5'-UTR mainly decreased its mRNA stability rather than altering its translational efficiency. We next performed the plasmid transfection experiments and used actinomycin D to inhibit transcription. The results showed that this 5'-UTR promoted its mRNA decay. Additional transfection and nucleofection experiments using RNAs prepared in vitro illustrated that, in both the cytoplasm and the nucleus of cells, the optional long 5'-UTR-linked mRNAs decayed faster than those without the link. Overall, our study brings new insight to the regulation of the human ACAT1 gene expression at the post-transcription level.
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