Structural basis for the binding of IRES RNAs to the head of the ribosomal 40S subunit.

Structural basis for the binding of IRES RNAs to the head of the ribosomal 40S subunit.
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DOI:
10.1093/nar/gkr114
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发表时间:
2011-07
影响因子:
14.9
通讯作者:
Spahn CM
Spahn CM
中科院分区:
生物学2区
文献类型:
--
作者:
Muhs M;Yamamoto H;Ismer J;Takaku H;Nashimoto M;Uchiumi T;Nakashima N;Mielke T;Hildebrand PW;Nierhaus KH;Spahn CM

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一些病毒利用内部启动在宿主细胞中传播。这种类型的启动由启动子Aug上游的结构元件(内部核糖体进入位点,IRES)促进,并且只需要减少数量的规范启动因子。一个重要的例子是Dicistroviridae病毒家族的IRES,它与小的核糖体40S亚基的亚基间侧结合,并导致在没有任何启动因子的帮助下形成伸长能力强的80S核糖体。在这里,我们在这种类型的启动背景下对真核特异性核糖体蛋白rpS25的功能和结构进行了全面的分析,并提出了一个结构模型,解释了rpS25劫持核糖体的基本参与。
Some viruses exploit internal initiation for their propagation in the host cell. This type of initiation is facilitated by structured elements (internal ribosome entry site, IRES) upstream of the initiator AUG and requires only a reduced number of canonical initiation factors. An important example are IRES of the virus family Dicistroviridae that bind to the inter-subunit side of the small ribosomal 40S subunit and lead to the formation of elongation-competent 80S ribosomes without the help of any initiation factor. Here, we present a comprehensive functional and structural analysis of eukaryotic-specific ribosomal protein rpS25 in the context of this type of initiation and propose a structural model explaining the essential involvement of rpS25 for hijacking the ribosome.
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