研究揭示Poly(A)穩定RNA的分子機制
作者:
小柯機器人發布時間:2021/1/9 21:11:09
美國耶魯大學醫學院Joan A. Steitz研究組取得最新進展。他們揭示通過poly(A)尾部3′-末端結合袋和poly(A)-RNA相互作用的其他方式穩定RNA。相關論文於2021年1月7日發表於國際頂尖學術期刊《科學》。
水稻hAT轉座子mRNA與poly(A)28複合的雙ENE的2.89-Å解析度晶體結構揭示了與poly(A)相互作用的多種模式,包括主要凹槽三重螺旋、擴展的微小凹槽與RNA 雙螺旋的相互作用,一個基於五元組的基序,將poly(A)從次要凹槽關聯轉變為主要凹槽的三重螺旋,以及一個poly(A)3′-末端結合袋。他們的發現既擴展了與RNA長距離相互作用所涉及的基序,又提供了關於聚腺苷酸化如何保護RNA極端3′末端的見解。
據悉,Poly(A)尾部添加到各種RNA的3'末端是高度保守的修飾,在細胞RNA功能中起著核心作用。核表達元件(ENEs)是順式作用的RNA元件,通過將多尾部隔離在RNA三鏈體結構中來穩定它們。
附:英文原文
Title: RNA stabilization by a poly(A) tail 3-end binding pocket and other modes of poly(A)-RNA interaction
Author: Seyed-Fakhreddin Torabi, Anand T. Vaidya, Kazimierz T. Tycowski, Suzanne J. DeGregorio, Jimin Wang, Mei-Di Shu, Thomas A. Steitz, Joan A. Steitz
Issue&Volume: 2021/01/07
Abstract: Poly(A) tail addition to the 3 end of a wide range of RNAs is a highly conserved modification that plays a central role in cellular RNA function. Elements for nuclear expression (ENEs) are cis-acting RNA elements that stabilize poly(A) tails by sequestering them in RNA triplex structures. A 2.89- resolution crystal structure of a double ENE from a rice hAT transposon mRNA complexed with poly(A)28 reveals multiple modes of interaction with poly(A), including major-groove triple helices, extended minor-groove interactions with RNA double helices, a quintuple-base motif that transitions poly(A) from minor-groove associations to major-groove triple helices, and a poly(A) 3-end binding pocket. Our findings both expand the repertoire of motifs involved in long-range RNA interactions and provide insights into how polyadenylation can protect an RNA’s extreme 3 end.
DOI: 10.1126/science.abe6523
Source: https://science.sciencemag.org/content/early/2021/01/07/science.abe6523
Science:《科學》,創刊於1880年。隸屬於美國科學促進會,最新IF:41.037