Structural and functional analysis of ribosome assembly factor Efg1.

Structural and functional analysis of ribosome assembly factor Efg1.
复制标题

核糖体组装因子Efg1的结构和功能分析。

DOI:
10.1093/nar/gky011
复制
发表时间:
2018-02-28
影响因子:
14.9
通讯作者:
Ye K
Ye K
中科院分区:
生物学2区
文献类型:
--
作者:
Shu S;Ye K

文献摘要

参考文献

被引文献

相似文献

真核生物中的核糖体生物合成是一个复杂的过程,涉及许多组装因子和snoRNA的缔合和解离。酵母核糖体小亚基首先以有序和动态的方式组装成90 S前核糖体。Efg1是一种没有可识别结构域的蛋白质,与90年代早期的颗粒相关。在这里,我们确定Efg1的晶体结构,从嗜热毛壳菌在3.3微米分辨率,揭示了一种新的拉长的全螺旋结构。Efg1不位于最近确定的低温EM密度的90S可能是由于其在成熟的90S低丰度。在酿酒酵母中的遗传分析表明,Efg1的功能核心包含两个高度保守的残基组成的螺旋发夹。Efg1的缺失阻断了位点A1和A2的18S rRNA加工,但不阻断位点A0的18S rRNA加工,以及核糖体小亚基的产生。Efg1最初由18SrRNA的5′结构域募集。它的缺失干扰了5′结构域的组装,并抑制了90 S上U14 snoRNA的释放。我们的研究表明Efg1是18SrRNA 5′端结构域早期组装和重组所必需的。
Ribosome biogenesis in eukaryotes is a complicated process that involves association and dissociation of numerous assembly factors and snoRNAs. The yeast small ribosomal subunit is first assembled into 90S pre-ribosomes in an ordered and dynamic manner. Efg1 is a protein with no recognizable domain that is associated with early 90S particles. Here, we determine the crystal structure of Efg1 from Chaetomium thermophilum at 3.3 Å resolution, revealing a novel elongated all-helical structure. Efg1 is not located in recently determined cryo-EM densities of 90S likely due to its low abundance in mature 90S. Genetic analysis in Saccharomyces cerevisiae shows that the functional core of Efg1 contains two helical hairpins composed of highly conserved residues. Depletion of Efg1 blocks 18S rRNA processing at sites A1 and A2, but not at site A0, and production of small ribosomal subunits. Efg1 is initially recruited by the 5′ domain of 18S rRNA. Its absence disturbs the assembly of the 5′ domain and inhibits release of U14 snoRNA from 90S. Our study shows that Efg1 is required for early assembly and reorganization of the 5′ domain of 18S rRNA.
DOI: 10.1371/journal.pbio.1001669
发表时间: 2013-10
期刊: PLoS biology
影响因子: 9.8
作者:
Lin J;Lu J;Feng Y;Sun M;Ye K
通讯作者: Ye K
DOI: 10.1128/mcb.00664-06
发表时间: 2006-10-01
影响因子: 5.3
作者:
Liang, Xue-hai;Fournier, Maurille J.
通讯作者: Fournier, Maurille J.
DOI: 10.1016/s1097-2765(02)00579-8
发表时间: 2002-07-01
期刊: MOLECULAR CELL
影响因子: 16
作者:
Grandi, P;Rybin, V;Hurt, E
通讯作者: Hurt, E
DOI: 10.1107/s0907444909052925
发表时间: 2010-02
期刊: Acta crystallographica. Section D, Biological crystallography
影响因子: --
作者:
Adams PD;Afonine PV;Bunkóczi G;Chen VB;Davis IW;Echols N;Headd JJ;Hung LW;Kapral GJ;Grosse-Kunstleve RW;McCoy AJ;Moriarty NW;Oeffner R;Read RJ;Richardson DC;Richardson JS;Terwilliger TC;Zwart PH
通讯作者: Zwart PH
DOI: 10.1101/gad.274688.115
发表时间: 2016-03-15
影响因子: 10.5
作者:
Zhang L;Wu C;Cai G;Chen S;Ye K
通讯作者: Ye K