The RNA helicase Mtr4p modulates polyadenylation in the TRAMP complex.

The RNA helicase Mtr4p modulates polyadenylation in the TRAMP complex.
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DOI:
10.1016/j.cell.2011.05.010
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发表时间:
2011-06-10
期刊:
影响因子:
64.5
通讯作者:
Jankowsky E
Jankowsky E
中科院分区:
生物学1区
文献类型:
--
作者:
Jia H;Wang X;Liu F;Guenther UP;Srinivasan S;Anderson JT;Jankowsky E

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核 RNA 加工、监视和降解的许多步骤都需要 TRAMP,这是一种含有多聚腺苷酸聚合酶 Trf4p、Zn 关节蛋白 Air​​2p 和 RNA 解旋酶 Mtr4p 的复合物。 TRAMP 使 RNA 多聚腺苷酸化,从而被核外泌体降解或修剪。目前尚不清楚 TRAMP 的聚腺苷酸化与传统的聚腺苷酸聚合酶的聚腺苷酸化有何不同,后者产生稳定 RNA 的聚腺苷酸尾。使用重建的酿酒酵母 TRAMP,我们发现 TRAMP 仅在 3-4 个腺苷后固有地抑制聚腺苷酸的添加。这种 Poly(A) 尾长度限制由 Mtr4p 控制。解旋酶检测 3' 末端腺苷的数量,并通过几个腺苷酸化步骤,引发对腺苷酸化和 TRAMP 解离的 ATP 亲和力和速率常数的精确调整。我们的数据表明 Mtr4p 是 TRAMP 多腺苷酸化的关键调节因子,并揭示 RNA 解旋酶可以以高度复杂的方式控制另一种酶的活性,并响应 RNA 的特征。
Many steps in nuclear RNA processing, surveillance and degradation require TRAMP, a complex containing the poly(A) polymerase Trf4p, the Zn-knuckle protein Air2p, and the RNA helicase Mtr4p. TRAMP polyadenylates RNAs designated for decay or trimming by the nuclear exosome. It has been unclear how polyadenylation by TRAMP differs from polyadenylation by conventional poly(A) polymerase, which produces poly(A) tails that stabilize RNAs. Using reconstituted S.cerevisiae TRAMP, we show that TRAMP inherently suppresses poly(A) addition after only 3–4 adenosines. This poly(A) tail length restriction is controlled by Mtr4p. The helicase detects the number of 3'-terminal adenosines and, over several adenylation steps, elicits precisely tuned adjustments of ATP affinities and rate constants for adenylation and TRAMP dissociation. Our data establish Mtr4p as critical regulator of polyadenylation by TRAMP and reveal that an RNA helicase can control the activity of another enzyme in a highly complex fashion and in response to features in RNA.
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