Aminoacylation of tRNAs encoded by Chlorella virus CVK2.

Aminoacylation of tRNAs encoded by Chlorella virus CVK2.
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小球藻病毒 CVK2 编码的 tRNA 的氨酰化。

DOI:
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发表时间:
1999
期刊:
影响因子:
3.7
通讯作者:
Takashi Yamada
Takashi Yamada
中科院分区:
医学3区
文献类型:
--
作者:
K. Nishida;T. Kawasaki;M. Fujie;S. Usami;Takashi Yamada

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感染某些单细胞绿藻(小球藻)的病毒有一个大的线性dsDNA基因组,大小为330-380 kb;该基因组大小是已知病毒中最大的,大约相当于生殖支原体最小原核基因组(580 kb)的60%。除了许多假定的蛋白质编码基因外,这些病毒基因组中还存在10-15个tRNA基因簇。其中一些tRNA基因含有特殊的插入。在被感染的宿主细胞中,小球藻病毒分离物CVK2的病毒tRNA已被证明共转录为一个大的前体,大小约为1.0 kb,它被精确地加工成单个成熟的tRNA物种。对其中8个trna进行的酸性Northern blot分析显示,它们在体内实际上是氨基酰化的,表明它们参与了病毒蛋白的合成。它们可能通过克服病毒和宿主之间存在的密码子使用障碍,帮助病毒达到最大的复制潜力。这些结果证明,宿主蛋白质合成机制的某些成分可以被病毒基因产物所取代。这是真核生物病毒编码tRNA氨基酰化的首次报道。
Viruses that infect certain strains of the unicellular green alga, Chlorella, have a large, linear dsDNA genome that is 330-380 kb in size; this genomic size is the largest known among viruses and is equivalent to approximately 60% of the smallest prokaryotic genome of Mycoplasma genitalium (580 kb). Besides many putative protein-coding genes, a cluster of 10-15 tRNA genes is present in these viral genomes. Some of these tRNA genes contain peculiar insertions. In infected host cells, the viral tRNAs of CVK2, a Chlorella virus isolate, have been demonstrated to be cotranscribed as a large precursor, approximately 1.0 kb in size, that is precisely processed into individual mature tRNA species. Acidic Northern blot analysis of eight of these tRNAs has revealed that they are actually aminoacylated in vivo, indicating their involvement in viral protein synthesis. They may help the virus reach maximal replication potential by overcoming codon usage barriers that exist between the virus and its host. These results provide evidence that some components of the host protein synthesis machinery can be replaced by viral gene products. This is the first report of tRNA aminoacylation encoded by viruses of eukaryotes.
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DOI: 10.1006/viro.1995.1462
发表时间: 1995
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影响因子: --
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小球藻病毒含有线性非排列双链 DNA 基因组,具有共价闭合的发夹末端。
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DOI: 10.1006/viro.1996.0482
发表时间: 1996
期刊: Virology.
影响因子: --
作者:
Kutish,GF;Li,Y;Lu,Z;Furuta,M;Rock,DL;VanEtten,JL
通讯作者: VanEtten,JL
DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
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