RNA editing underlies temperature adaptation in K+ channels from polar octopuses.

RNA editing underlies temperature adaptation in K+ channels from polar octopuses.
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DOI:
10.1126/science.1212795
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发表时间:
2012-02-17
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Rosenthal JJ
Rosenthal JJ
中科院分区:
其他
文献类型:
--
作者:
Garrett S;Rosenthal JJ

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为了在极端寒冷的环境中工作,嗜冷者的离子通道必须进化出结构变化,以补偿他们的热环境。一个合理的假设是,潜在的适应存在于编码基因中。在这里,我们发现来自南极和热带章鱼的延迟整流钾通道基因编码的通道只有四个位置不同,并且在非洲爪哇卵母细胞中表达时表现出非常相似的行为。然而,转录的mRNAs被广泛编辑,创造了功能多样性。一个编辑站点,在通道的孔洞中将异亮氨酸重新编码为valine,通过破坏开放状态来极大地加速门控动力学。本网站对南极和北极物种都进行了广泛的编辑,但大多数热带物种都没有编辑。因此,A-to-I RNA编辑可以对物理环境做出响应。
To operate in the extreme cold, ion channels from psychrophiles must have evolved structural changes to compensate for their thermal environment. A reasonable assumption would be that the underlying adaptations lie within the encoding genes. Here we show that delayed rectifier K+ channel genes from an Antarctic and a tropical octopus encode channels that differ at only four positions and display very similar behavior when expressed in Xenopus oocytes. However, the transcribed mRNAs are extensively edited, creating functional diversity. One editing site, which recodes an isoleucine to a valine in the channel’s pore, greatly accelerates gating kinetics by destabilizing the open state. This site is extensively edited in both Antarctic and Arctic species, but mostly unedited in tropical species. Thus A-to-I RNA editing can respond to the physical environment.
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