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RNA secondary structures located in the interchromosomal region of human ACAT1 chimeric mRNA are required to produce the 56-kDa isoform
2008
发表期刊CELL RESEARCH (IF:28.1[JCR-2023],36.4[5-Year])
ISSN1001-0602
EISSN1748-7838
卷号18期号:9页码:921-936
发表状态已发表
DOI10.1038/cr.2008.66
摘要

processing of two discontinuous RNAs transcribed from chromosomes 1 and 7. The chimeric mRNA uses AUG(1397-1399) and GGC(1274-1276) as translation initiation codons to produce normal 50-kDa ACAT1 and a novel enzymatically active 56-kDa isoform, respectively, with the latter being authentically present in human cells, including human monocyte-derived macrophages. In this work, we report that RNA secondary structures located in the vicinity of the GGC(1274-1276) codon are required for production of the 56-kDa isoform. The effects of the three predicted stem-loops (nt 1255-1268, 1286-1342 and 1355-1384) were tested individually by transfecting expression plasmids into cells that contained the wild-type, deleted or mutant stem-loop sequences linked to a partial ACAT1 AUG open reading frame (ORF) or to the ORFs of other genes. The expression patterns were monitored by western blot analyses. We found that the upstream stem-loop(1255-1268) from chromosome 7 and downstream stem-loop(1286-1342) from chromosome 1 were needed for production of the 56-kDa isoform, whereas the last stem-loop(1355-1384) from chromosome 1 was dispensable. The results of experiments using both monocistronic and bicistronic vectors with a stable hairpin showed that translation initiation from the GGC(1274-1276) codon was mediated by an internal ribosome entry site (IRES). Further experiments revealed that translation initiation from the GGC(1274-1276) codon requires the upstream AU-constituted RNA secondary structure and the downstream GC-rich structure. This mechanistic work provides further support for the biological significance of the chimeric nature of the human ACAT1 transcript.

关键词human ACAT1 isoform chimeric human ACAT1 mRNA interchromosomal region RNA secondary structure internal ribosome entry site
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收录类别SCI
WOS研究方向Cell Biology
WOS类目Cell Biology
WOS记录号WOS:000259891200004
WOS关键词A-CHOLESTEROL ACYLTRANSFERASE ; INTERNAL RIBOSOMAL ENTRY ; 2 DIFFERENT CHROMOSOMES ; ACYL-COENZYME ; TRANSLATION INITIATION ; BINDING-PROTEIN ; GENE-EXPRESSION ; HEPATITIS-C ; IN-VITRO ; VIRUS
原始文献类型Article
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文献类型期刊论文
条目标识符https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/120384
专题个人在本单位外知识产出
共同第一作者Zhao, Xiao-Nan
通讯作者Li, Bo-Liang
作者单位
1.Chinese Acad Sci, Shanghai Inst Biol Sci, State Key Lab Mol Biol, Inst Biochem & Cell Biol, Shanghai 200031, Peoples R China
2.Dartmouth Med Sch, Dept Biochem, Hanover, NH 03756 USA
推荐引用方式
GB/T 7714
Chen, Jia,Zhao, Xiao-Nan,Yang, Li,et al. RNA secondary structures located in the interchromosomal region of human ACAT1 chimeric mRNA are required to produce the 56-kDa isoform[J]. CELL RESEARCH,2008,18(9):921-936.
APA Chen, Jia.,Zhao, Xiao-Nan.,Yang, Li.,Hu, Guang-Jing.,Lu, Ming.,...&Li, Bo-Liang.(2008).RNA secondary structures located in the interchromosomal region of human ACAT1 chimeric mRNA are required to produce the 56-kDa isoform.CELL RESEARCH,18(9),921-936.
MLA Chen, Jia,et al."RNA secondary structures located in the interchromosomal region of human ACAT1 chimeric mRNA are required to produce the 56-kDa isoform".CELL RESEARCH 18.9(2008):921-936.
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