RNA polymerase II collision interrupts convergent transcription.

RNA polymerase II collision interrupts convergent transcription.
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DOI:
10.1016/j.molcel.2012.08.027
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发表时间:
2012-11-09
期刊:
影响因子:
16
通讯作者:
Svejstrup, Jesper Q.
Svejstrup, Jesper Q.
中科院分区:
生物学1区
文献类型:
--
作者:
Hobson, David J.;Wei, Wu;Steinmetz, Lars M.;Svejstrup, Jesper Q.

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反义非编码转录本、基因内基因和会聚基因对在真核生物中普遍存在。这种转录单位的存在提出了一个问题,当RNA聚合酶II(RNAPII)分子头对头碰撞时会发生什么。在这里,我们在酵母中使用生物化学和遗传学方法的组合,以表明转录相反DNA链的聚合酶不能绕过彼此。RNAPII在体外头对头碰撞时停止但不解离,表明相对的聚合酶代表彼此不可逾越的障碍。头对头碰撞在体内也导致RNAPII停止,并从DNA模板中去除碰撞RNAPII可以通过泛素化定向蛋白水解实现。事实上,在缺乏有效的RNAPII多泛素化的细胞中,碰撞的聚合酶的半衰期增加,因此它们可以在会聚基因之间被检测到。这些结果提供了深入了解基因交通控制的基本机制,并指出一个未探索的影响,反义转录对基因调控通过聚合酶碰撞。在体外,当碰撞蛋白质的前缘接触时,RNAPII停止。碰撞的聚合酶保持与模板的稳定结合。碰撞的RNAPII在elc1Δ菌株中的会聚基因之间积累。
Antisense noncoding transcripts, genes-within-genes, and convergent gene pairs are prevalent among eukaryotes. The existence of such transcription units raises the question of what happens when RNA polymerase II (RNAPII) molecules collide head-to-head. Here we use a combination of biochemical and genetic approaches in yeast to show that polymerases transcribing opposite DNA strands cannot bypass each other. RNAPII stops but does not dissociate upon head-to-head collision in vitro, suggesting that opposing polymerases represent insurmountable obstacles for each other. Head-to-head collision in vivo also results in RNAPII stopping, and removal of collided RNAPII from the DNA template can be achieved via ubiquitylation-directed proteolysis. Indeed, in cells lacking efficient RNAPII polyubiquitylation, the half-life of collided polymerases increases, so that they can be detected between convergent genes. These results provide insight into fundamental mechanisms of gene traffic control and point to an unexplored effect of antisense transcription on gene regulation via polymerase collision. ► Convergently transcribing RNAPIIs cannot transcribe past one another in vivo ► In vitro, RNAPII stops when the front edges of the colliding proteins touch ► Collided polymerases remain stably associated with the template ► Collided RNAPII accumulates between convergent genes in elc1Δ strains
DOI: 10.1016/j.molcel.2009.06.009
发表时间: 2009-07-31
期刊: MOLECULAR CELL
影响因子: 16
作者:
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期刊: SCIENCE
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通讯作者: Kornberg, RD
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发表时间: 2009-12-08
影响因子: 11.1
作者:
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通讯作者: Svejstrup, Jesper Q.
DOI: 10.1016/s1097-2765(00)80179-3
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期刊: MOLECULAR CELL
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