The role of ABCE1 in eukaryotic posttermination ribosomal recycling.

The role of ABCE1 in eukaryotic posttermination ribosomal recycling.
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DOI:
10.1016/j.molcel.2009.12.034
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发表时间:
2010-01-29
期刊:
影响因子:
16
通讯作者:
Pestova TV
Pestova TV
中科院分区:
生物学1区
文献类型:
--
作者:
Pisarev AV;Skabkin MA;Pisareva VP;Skabkina OV;Rakotondrafara AM;Hentze MW;Hellen CU;Pestova TV

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终止后,真核80S核糖体与mRNA,p位点脱酰化的tRNA和释放因子ERF1相关,并且必须通过分离这些配体并将核糖体分离为亚基来回收。尽管真核后末端复合物的回收(TC)可以通过启动因子EIF3,EIF1和EIF1A介导,但这种无势能机制只能在狭窄的低Mg2+浓度范围内起作用。在这里,我们报告说,ABCE1是ATP结合盒(ABC)蛋白质家族的保守和必不可少的成员,它促进了在多种MG2+浓度范围内的真核核糖体回收。 ABCE1将TC分离为自由的60s亚基以及tRNA和TRNA结合的40S亚基。它可以水解ATP,GTP,UTP和CTP。 ABCE1通过TCS刺激NTP水解,这是其回收活性所必需的。重要的是,ABCE1仅通过ERF1/ERF3(或单独使用ERF1)获得的TCS分离,而不是在ERF1缺席的情况下用紫霉素获得的-TCS。
After termination, eukaryotic 80S ribosomes remain associated with mRNA, P-site deacylated tRNA and release factor eRF1, and must be recycled by dissociating these ligands and separating ribosomes into subunits. Although recycling of eukaryotic post-termination complexes (post-TCs) can be mediated by initiation factors eIF3, eIF1 and eIF1A, this energy-free mechanism can function only in a narrow range of low Mg2+ concentrations. Here we report that ABCE1, a conserved and essential member of the ATP-binding cassette (ABC) family of proteins, promotes eukaryotic ribosomal recycling over a wide range of Mg2+ concentrations. ABCE1 dissociates post-TCs into free 60S subunits and mRNA- and tRNA-bound 40S subunits. It can hydrolyze ATP, GTP, UTP and CTP. NTP hydrolysis by ABCE1 is stimulated by post-TCs and is required for its recycling activity. Importantly, ABCE1 dissociates only post-TCs obtained with eRF1/eRF3 (or eRF1 alone), but not post-TCs obtained with puromycin in eRF1's absence.
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