Structural basis for dual roles of Aar2p in U5 snRNP assembly.
Structural basis for dual roles of Aar2p in U5 snRNP assembly.
复制标题
Aar2p 在 U5 snRNP 组装中双重作用的结构基础
DOI:
10.1101/gad.213207.113
复制
发表时间:
2013
影响因子:
10.5
通讯作者:
Wahl M.C.
中科院分区:
文献类型:
--
作者:
Cristao;Santos;Mozaffari Jovin;Heroven;Holton;Lührmann;Wahl M.C.
Yeast U5 small nuclear ribonucleoprotein particle (snRNP) is assembled via a cytoplasmic precursor that contains the U5-specific Prp8 protein but lacks the U5-specific Brr2 helicase. Instead, pre-U5 snRNP includes the Aar2 protein not found in mature U5 snRNP or spliceosomes. Aar2p and Brr2p bind competitively to a C-terminal region of Prp8p that comprises consecutive RNase H-like and Jab1/MPN-like domains. To elucidate the molecular basis for this competition, we determined the crystal structure of Aar2p in complex with the Prp8p RNase H and Jab1/MPN domains. Aar2p binds on one side of the RNase H domain and extends its C terminus to the other side, where the Jab1/MPN domain is docked onto a composite Aar2p–RNase H platform. Known Brr2p interaction sites of the Jab1/MPN domain remain available, suggesting that Aar2p-mediated compaction of the Prp8p domains sterically interferes with Brr2p binding. Moreover, Aar2p occupies known RNA-binding sites of the RNase H domain, and Aar2p interferes with binding of U4/U6 di-snRNA to the Prp8p C-terminal region. Structural and functional analyses of phospho-mimetic mutations reveal how phosphorylation reduces affinity of Aar2p for Prp8p and allows Brr2p and U4/U6 binding. Our results show how Aar2p regulates both protein and RNA binding to Prp8p during U5 snRNP assembly.
登录
查看更多内容
影响因子:
9.2
作者:
L. Verdone;S. Galardi;D. Page;J. Beggs
通讯作者:
J. Beggs
影响因子:
6.8
作者:
S. Darst
通讯作者:
S. Darst
影响因子:
16.8
作者:
Ritchie, Dustin B.;Schellenberg, Matthew J.;MacMillan, Andrew M.
通讯作者:
MacMillan, Andrew M.
DOI:
10.1017/s1355838299981785
发表时间:
1999
期刊:
RNA (New York, N.Y.)
影响因子:
--
作者:
Reyes,JL;Gustafson,EH;Luo,HR;Moore,MJ;Konarska,MM
通讯作者:
Konarska,MM
DOI:
10.1073/pnas.0805960105
发表时间:
2008
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
作者:
Kui Yang;Lingdi Zhang;Tao Xu;A. Héroux;R. Zhao
通讯作者:
R. Zhao