Structural evidence for consecutive Hel308-like modules in the spliceosomal ATPase Brr2.

Structural evidence for consecutive Hel308-like modules in the spliceosomal ATPase Brr2.
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剪接ATPase BRR2中连续的HEL308类模块的结构证据。

DOI:
10.1038/nsmb.1625
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发表时间:
2009-07
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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Brr 2是一种DExD/H-box解旋酶,负责剪接体激活过程中的U4/U6解旋。Brr 2含有两个解旋酶样结构域,每个结构域后面是一个功能未知的Sec 63结构域。我们确定了第二个Sec 63结构域的晶体结构,它出乎意料地类似于DNA解旋酶Hel 308的结构域4和5。这与Brr 2的解旋酶样结构域和Hel 308的结构域1-3之间的序列相似性一起,使我们假设Brr 2包含两个连续的Hel 308样模块(Hel 308-I和II)。我们的结构模型和诱变数据表明,Brr 2与Hel 308具有相似的解旋酶机制。我们证明了Hel 308-II在体外和体内与Prp 8和Snu 114相互作用。我们进一步发现Prp 8的C-末端区域(Prp 8-CTR)促进Brr 2/Prp 8-CTR复合物与U4/U6的结合。我们的研究结果具有重要意义的机制和调节Brr 2的活动。
Brr2 is a DExD/H-box helicase responsible for U4/U6 unwinding during spliceosomal activation. Brr2 contains two helicase-like domains, each of which is followed by a Sec63 domain with unknown function. We determined the crystal structure of the second Sec63 domain, which unexpectedly resembles domains 4 and 5 of DNA helicase Hel308. This, together with sequence similarities between Brr2’s helicase-like domains and domains 1–3 of Hel308, led us to hypothesize that Brr2 contains two consecutive Hel308-like modules (Hel308-I and II). Our structural model and mutagenesis data suggest that Brr2 shares a similar helicase mechanism with Hel308. We demonstrate that Hel308-II interacts with Prp8 and Snu114 in vitro and in vivo. We further find that the C-terminal region of Prp8 (Prp8-CTR) facilitates the binding of the Brr2/Prp8-CTR complex to U4/U6. Our results have important implications for the mechanism and regulation of Brr2’s activity.
DOI: 10.1038/nsmb.1506
发表时间: 2008-11-01
影响因子: 16.8
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