The making of a slicer: activation of human Argonaute-1.

The making of a slicer: activation of human Argonaute-1.
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DOI:
10.1016/j.celrep.2013.05.033
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发表时间:
2013-06-27
期刊:
影响因子:
8.8
通讯作者:
Joshua-Tor L
Joshua-Tor L
中科院分区:
生物学1区
文献类型:
--
作者:
Faehnle CR;Elkayam E;Haase AD;Hannon GJ;Joshua-Tor L

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Argonaute是小RNA沉默途径中的中心蛋白质组分。在四种人类Argonautes(hAgo 1 -4)中,只有hAgo 2是活性切片器。我们确定了与内源性共纯化RNA结合的hAgo 1的结构,分辨率为1.75 μ m,负载let-7 miRNA的hAgo 1的分辨率为2.1 μ m。这两种结构与hAgo 2的结构惊人地相似。hAgo 2的PIWI结构域内的保守催化四联体是其切割活性所需的。四分体的完成与邻近hAgo 1活性位点的环上的突变相结合,导致通过交换hAgo 2的N结构域而显著增强的切割活性。hAgo 3具有完整的四分体,通过交换hAgo 2的N结构域而成为活性切片器,而没有额外的突变。有趣的是,使Argonaute成为一个活性切片器的因素涉及酶的活性位点和更远区域之间复杂的相互作用。
Argonautes are the central protein component in small RNA silencing pathways. Of the four human Argonautes (hAgo1–4) only hAgo2 is an active slicer. We determined the structure of hAgo1 bound to endogenous copurified RNAs to 1.75 Å resolution and hAgo1 loaded with let-7 miRNA to 2.1 Å. Both structures are strikingly similar to the structures of hAgo2. A conserved catalytic tetrad within the PIWI domain of hAgo2 is required for its slicing activity. Completion of the tetrad combined with a mutation on a loop adjacent to the active site of hAgo1 results in slicer activity that is substantially enhanced by swapping in the N domain of hAgo2. hAgo3, with an intact tetrad, becomes an active slicer by swapping the N domain of hAgo2, without additional mutations. Intriguingly, the elements that make Argonaute an active slicer involve a sophisticated interplay between the active site and more distant regions of the enzyme.
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