Structure and function of an RNase H domain at the heart of the spliceosome

被引:79
作者
Pena, Vladimir [1 ]
Rozov, Alexey
Fabrizio, Patrizia
Luehrmann, Reinhard [1 ]
Wahl, Markus C. [1 ,2 ]
机构
[1] Max Planck Inst Biophys Chem, Dept Cellular Biochem, AG Rontgenkristallog, D-37077 Gottingen, Germany
[2] Univ Gottingen, Univ Med, Gottingen, Germany
关键词
pre-mRNA splicing; Prp8; protein; RNase H domain; splicing catalysis; X-ray crystallography;
D O I
10.1038/emboj.2008.209
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Precursor-messenger RNA (pre-mRNA) splicing encompasses two sequential transesterification reactions in distinct active sites of the spliceosome that are transiently established by the interplay of small nuclear (sn) RNAs and spliceosomal proteins. Protein Prp8 is an active site component but the molecular mechanisms, by which it might facilitate splicing catalysis, are unknown. We have determined crystal structures of corresponding portions of yeast and human Prp8 that interact with functional regions of the pre-mRNA, revealing a phylogenetically conserved RNase H fold, augmented by Prp8-specific elements. Comparisons to RNase H-substrate complexes suggested how an RNA encompassing a 5'-splice site ( SS) could bind relative to Prp8 residues, which on mutation, suppress splice defects in pre-mRNAs and snRNAs. A truncated RNase H-like active centre lies next to a known contact region of the 5'SS and directed mutagenesis confirmed that this centre is a functional hotspot. These data suggest that Prp8 employs an RNase H domain to help assemble and stabilize the spliceosomal catalytic core, coordinate the activities of other splicing factors and possibly participate in chemical catalysis of splicing.
引用
收藏
页码:2929 / 2940
页数:12
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