研究揭示卵子發生過程中核孔的組裝機制
作者:
小柯機器人發布時間:2019/10/18 15:20:16
歐洲分子生物學實驗室Martin Beck和Bernhard Hampoelz研究團隊合作的最新研究發現,在卵子發生過程中,核孔蛋白凝聚組裝成核孔。 這一研究成果發表在2019年10月17日出版的《細胞》上。
研究顯示在果蠅卵子發生過程中,核孔蛋白相互作用並凝結形成核孔複合體(NPC)的不同前體顆粒。 Nup358是凝結到NPC組裝平臺中的關鍵參與者,而其mRNA則以翻譯依賴的方式定位在其表面上。在微管依賴運輸過程中,小GTPase Ran和核運輸受體相協調,調控卵母細胞中的NPC生物發生。該研究描述了一種非經典的NPC組裝機制,該機制依賴於核孔蛋白凝結,並在細胞周期停滯的條件下遠離細胞核發生。
據悉,目前研究認為指導核孔複合體(NPC)組裝到核膜的分子事件是發生在有絲分裂或細胞分裂間期的兩種途徑。在配子和胚胎細胞中,NPCs也出現在堆疊的胞質膜片內,稱為環狀片層(AL),可作為NPC的早期儲存庫。 然而NPC在細胞質膜上的生物發生機制仍然未知。
附:英文原文
Title: Nuclear Pores Assemble from Nucleoporin Condensates During Oogenesis
Author: Bernhard Hampoelz, Andre Schwarz, Paolo Ronchi, Helena Bragulat-Teixidor, Christian Tischer, Imre Gaspar, Anne Ephrussi, Yannick Schwab, Martin Beck
Issue&Volume: 2019/10/17
Abstract:
The molecular events that direct nuclear pore complex (NPC) assembly toward nuclear envelopes have been conceptualized in two pathways that occur during mitosis or interphase, respectively. In gametes and embryonic cells, NPCs also occur within stacked cytoplasmic membrane sheets, termed annulate lamellae (AL), which serve as NPC storage for early development. The mechanism of NPC biogenesis at cytoplasmic membranes remains unknown. Here, we show that during Drosophila oogenesis, Nucleoporins condense into different precursor granules that interact and progress into NPCs. Nup358 is a key player that condenses into NPC assembly platforms while its mRNA localizes to their surface in a translation-dependent manner. In concert, Microtubule-dependent transport, the small GTPase Ran and nuclear transport receptors regulate NPC biogenesis in oocytes. We delineate a non-canonical NPC assembly mechanism that relies on Nucleoporin condensates and occurs away from the nucleus under conditions of cell cycle arrest.
DOI: 10.1016/j.cell.2019.09.022
Source: https://www.cell.com/cell/fulltext/S0092-8674(19)31073-6
Cell:《細胞》,創刊於1974年。隸屬於細胞出版社,最新IF:36.216