Hepatitis A virus polyprotein synthesis initiates from two alternative AUG codons.
Hepatitis A virus polyprotein synthesis initiates from two alternative AUG codons.
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甲型肝炎病毒多蛋白合成从两个替代的 AUG 密码子开始。
DOI:
10.1016/0042-6822(92)90027-m
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发表时间:
1992
期刊:
影响因子:
3.7
通讯作者:
Ehrenfeld,E
中科院分区:
文献类型:
--
作者:
Tesar,M;Harmon,SA;Summers,DF;Ehrenfeld,E
The genomic RNA of hepatitis A virus has two potential translation initiation sites for synthesis of a 251-kDa polyprotein. It is not known which of these AUG codons, located at positions 735–737 and 741–743, is usedin vitroorin vivo. Site-directed mutagenesis was carried out to eliminate each start codon independently. Transcripts from the unmodified and modified cDNA clones were used either to program anin vitrotranslation system or for transfection of BS-C-1 cells.In vitroandin vivotranslation data revealed preferential usage of the downstream AUG located at position 741 to 743, although either site could be utilized in the absence of the other. Both modified RNAs were able to induce productive infections in BS-C-1 cells. Deletion of almost all of the 5′-untranslated region (5′ UTR) of the RNA, however, stimulated selection of AUG 735–737in vitroresulting in equal utilization of both sites, suggesting a strong influence of the 5′ UTR for directing the ribosome to a specific internal initiation site.
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