UUCAC- and Vera-dependent localization of VegT RNA in Xenopus oocytes

UUCAC- and Vera-dependent localization of VegT RNA in Xenopus oocytes
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DOI:
10.1016/s0960-9822(02)00740-6
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发表时间:
2002-04-02
期刊:
影响因子:
9.2
通讯作者:
Schnapp, BJ
Schnapp, BJ
中科院分区:
生物学1区
文献类型:
--
作者:
Kwon, S;Abramson, T;Schnapp, BJ

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定位的 mRNA 通过 3'UTR 中的“定位元件”(LE) 定向至目的地。 LE 拥有多个功能冗余的定位“信号”。这些信号的定义不明确,因此尚不清楚这些信号及其关联因子是每种 RNA 所独有的还是普遍使用的。 366 nt Vg1 LE (VgLE) 中的五个“E2”(UUCAC) 通过与蛋白 Vera/Vg1RBP/ZBP 的结合将该转录物引导至非洲爪蟾卵母细胞的植物极 [1-3]。在这里,我们展示了一种不同的植物 RNA,VegT,采用相同的信号和因子。 VegT 3'UTR 的 440 nt 子区域 (VegT440) 内的五个 E2 预测其 LE,并且对于指导定位来说是必要且充分的(在反义 VegT440 的背景下)。 VegT440 和 VgLE 中的 E2 功能与招募 Vera 蛋白的功能类似:(1) 在两种情况下,E2 nt 替换部分(UU 至 AC)或完全(CA 至 UG)根据 Vera 蛋白对 E2 的序列选择性抑制定位; (2) VegT440 和 VgLE 以 E2 依赖性方式交叉竞争,进行定位和 Vera 结合; (3)将抗Vera抗体注射到卵母细胞中抑制两种注射转录物的定位。这些发现意味着一般定位信号传输不同的 RNA。
Localized mRNAs are directed to their destinations by "localization elements" (LEs) in their 3'UTRs. LEs harbor multiple, functionally redundant localization "signals." These signals are poorly defined, hence it is unclear whether the signals-and their cognate factors-are unique to each RNA or employed generally. Five "E2s" (UUCACs) in the 366 nt Vg1 LE (VgLE) direct this transcript to the vegetal pole of Xenopus oocytes via the binding of a protein-Vera/Vg1RBP/ZBP [1-3]. Here we show that a different vegetal RNA, VegT, employs the same signal and factor. Five E2s within a 440 nt subregion (VegT440) of the VegT 3'UTR predict its LE and are both necessary and sufficient (in the context of antisense VegT440) for directing localization. The E2s in VegT440 and VgLE function similarly to recruit Vera protein: (1) in both contexts, E2 nt substitutions partially (UU to AC) or completely (CA to UG) inhibit localization in accordance with the sequence selectivity of Vera protein for E2s; (2) VegT440 and VgLE crosscompete, in an E2-dependent manner, for localization and Vera binding; (3) injection of anti-Vera antibody into oocytes inhibits localization of both injected transcripts. These findings imply that general localization signals traffic diverse RNAs.