Role of the conserved AAUAAA sequence: four AAUAAA point mutants prevent messenger RNA 3' end formation.

Role of the conserved AAUAAA sequence: four AAUAAA point mutants prevent messenger RNA 3' end formation.
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保守 AAUAAA 序列的作用:四个 AAUAAA 点突变体阻止信使 RNA 3 末端的形成。

DOI:
10.1126/science.6208611
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发表时间:
1984
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Stephenson,P
Stephenson,P
中科院分区:
--
文献类型:
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作者:
Wickens,M;Stephenson,P

文献摘要

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SV40序列信息的一个小区域(220个碱基)——聚腺苷酸化位点之前的141个碱基和之后的79个碱基——足以裂解信使RNA前体(即形成成熟的3'末端)、添加聚腺苷酸以及将信使RNA从细胞核转运到细胞质。这 220 个碱基包括一个高度保守的序列——AAUAAA(A,腺嘌呤;U,尿嘧啶)。该序列中的四个点突变 - AACAAA、AAUUAA、AAUACA 和 AAUGAA(C,胞嘧啶;G,鸟嘌呤) - 可防止裂解。
A small region (220 bases) of SV40 sequence information—141 bases before the polyadenylation site and 79 beyond—are sufficient for cleavage of an messenger RNA precursor (that is, the formation of a mature 3′ terminus), the addition of polyadenylic acid, and the transport of messenger RNA from the nucleus to the cytoplasm. These 220 bases include a highly conserved sequence—AAUAAA (A, adenine; U, uracil). Four point mutations in this sequence—AACAAA, AAUUAA, AAUACA, and AAUGAA (C, cytosine; G, guanine)—prevent cleavage.