Analysis of the interaction with the hepatitis C virus mRNA reveals an alternative mode of RNA recognition by the human La protein.

Analysis of the interaction with the hepatitis C virus mRNA reveals an alternative mode of RNA recognition by the human La protein.
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DOI:
10.1093/nar/gkr890
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发表时间:
2012-02
影响因子:
14.9
通讯作者:
Conte MR
Conte MR
中科院分区:
生物学2区
文献类型:
--
作者:
Martino L;Pennell S;Kelly G;Bui TT;Kotik-Kogan O;Smerdon SJ;Drake AF;Curry S;Conte MR

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人类La蛋白在编码和非编码RNA的生物学中都是一个必不可少的因素。在细胞核中,La主要与含有3‘寡核苷酸的RNA结合,而在细胞质中,La与一系列不同的缺少3’UUUOH拖尾的mRNA相互作用。后者的一个例子是La与丙型肝炎病毒(HCV)RNA的IRES结构域IV结合,这与病毒翻译刺激有关。通过系统的生物物理研究,我们发现La通过一种与RNA结合的模式与结构域IV结合,这与其通过3‘UUUOH拖尾与RNA结合的模式非常不同:虽然La基序和第一RNA识别基序(RRM1)足以与3’寡核苷酸高亲和力结合,但识别丙型肝炎病毒IV结构域需要La基序和RRM1与非典型的RRM2协同工作,而这在RNA结合中尚未被证明有显著的作用。这种新的结合模式似乎不是序列特异性的,但识别RNA的结构特征,特别是双链茎和单链延伸。这些发现为更好地理解La在病毒翻译启动中的作用铺平了道路。
Human La protein is an essential factor in the biology of both coding and non-coding RNAs. In the nucleus, La binds primarily to 3′ oligoU containing RNAs, while in the cytoplasm La interacts with an array of different mRNAs lacking a 3′ UUUOH trailer. An example of the latter is the binding of La to the IRES domain IV of the hepatitis C virus (HCV) RNA, which is associated with viral translation stimulation. By systematic biophysical investigations, we have found that La binds to domain IV using an RNA recognition that is quite distinct from its mode of binding to RNAs with a 3′ UUUOH trailer: although the La motif and first RNA recognition motif (RRM1) are sufficient for high-affinity binding to 3′ oligoU, recognition of HCV domain IV requires the La motif and RRM1 to work in concert with the atypical RRM2 which has not previously been shown to have a significant role in RNA binding. This new mode of binding does not appear sequence specific, but recognizes structural features of the RNA, in particular a double-stranded stem flanked by single-stranded extensions. These findings pave the way for a better understanding of the role of La in viral translation initiation.
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