Kaposi's sarcoma-associated herpesvirus ORF57 protein interacts with PYM to enhance translation of viral intronless mRNAs.

Kaposi's sarcoma-associated herpesvirus ORF57 protein interacts with PYM to enhance translation of viral intronless mRNAs.
复制标题

DOI:
10.1038/emboj.2010.77
复制
发表时间:
2010-06-02
期刊:
The EMBO journal
影响因子:
--
通讯作者:
Whitehouse A
Whitehouse A
中科院分区:
其他
文献类型:
--
作者:
Boyne JR;Jackson BR;Taylor A;Macnab SA;Whitehouse A

文献摘要

参考文献

被引文献

相似文献

卡波西肉瘤相关疱疹病毒(KSHV)表达许多无法进入剪接依赖的细胞mRNA核输出途径的无内含子mRNA。为了避免这个问题,KSHV编码开放阅读框57 (ORF57)蛋白,该蛋白协调形成一个具有输出能力的病毒核糖核蛋白颗粒,包括核输出复合体hTREX,但不包括外显子连接复合体(EJC)。有趣的是,EJCs刺激mRNA翻译,这就提出了一个有趣的问题,即无内含子的KSHV转录本是如何被有效翻译的。在这里,我们发现ORF57与48S预起始复合物的组分结合,并与40S核糖体亚基共同沉积。引人注目的是,我们观察到ORF57和PYM之间的直接相互作用,PYM是一种细胞蛋白,通过与EJC的相互作用,通过将48S预起始复合物招募到新输出的mrna中来增强翻译。此外,详细的生化分析表明,ORF57将PYM招募到无内含子的KSHV mRNA上,PYM随后促进ORF57与细胞翻译机制的关联。因此,我们提出了一个ORF57直接与PYM相互作用的模型,以增强无内含子的KSHV转录本的翻译。
Kaposi's sarcoma-associated herpesvirus (KSHV) expresses numerous intronless mRNAs that are unable to access splicing-dependent cellular mRNA nuclear export pathways. To circumvent this problem, KSHV encodes the open reading frame 57 (ORF57) protein, which orchestrates the formation of an export-competent virus ribonucleoprotein particle comprising the nuclear export complex hTREX, but not the exon-junction complex (EJC). Interestingly, EJCs stimulate mRNA translation, which raises the intriguing question of how intronless KSHV transcripts are efficiently translated. Herein, we show that ORF57 associates with components of the 48S pre-initiation complex and co-sediments with the 40S ribosomal subunits. Strikingly, we observed a direct interaction between ORF57 and PYM, a cellular protein that enhances translation by recruiting the 48S pre-initiation complex to newly exported mRNAs, through an interaction with the EJC. Moreover, detailed biochemical analysis suggests that ORF57 recruits PYM to intronless KSHV mRNA and PYM then facilitates the association of ORF57 and the cellular translation machinery. We, therefore, propose a model whereby ORF57 interacts directly with PYM to enhance translation of intronless KSHV transcripts.
DOI: 10.1073/pnas.0914856107
发表时间: 2010-02-09
影响因子: 11.1
作者:
Aoyagi, Mariko;Gaspar, Miguel;Shenk, Thomas E.
通讯作者: Shenk, Thomas E.
DOI: 10.1038/nsmb980
发表时间: 2005-09-01
影响因子: 16.8
作者:
Gudikote, JP;Imam, JS;Wilkinson, MF
通讯作者: Wilkinson, MF
DOI: 10.1101/gad.1.10.1183
发表时间: 1987-12-01
影响因子: 10.5
作者:
CALLIS, J;FROMM, M;WALBOT, V
通讯作者: WALBOT, V
DOI: 10.1016/j.cell.2006.10.044
发表时间: 2006-12-29
期刊: CELL
影响因子: 64.5
作者:
Cheng, Hong;Dufu, Kobina;Reed, Robin
通讯作者: Reed, Robin
DOI: 10.1099/0022-1317-74-8-1581
发表时间: 1993-08-01
影响因子: 3.8
作者:
HARRIS, M;COATES, K
通讯作者: COATES, K