Crystal structure of human U1 snRNP, a small nuclear ribonucleoprotein particle, reveals the mechanism of 5' splice site recognition.Kondo, Y., Oubridge, C., van Roon, A.M., Nagai, K.
(2015) Elife 4: --
- PubMed: 25555158
- DOI: 10.7554/eLife.04986
- Primary Citation of Related Structures:
- Also Cited By: 4WZJ
- PubMed Abstract:
- Functional organization of the Sm core in the crystal structure of human U1 snRNP.
Weber, G.,Trowitzsch, S.,Kastner, B.,Luhrmann, R.,Wahl, M.C.
(2010) EMBO J. 29: 4172
- Crystal structure at 1.92 A resolution of the RNA-binding domain of the U1A spliceosomal protein complexed with an RNA hairpin.
Oubridge, C.,Ito, N.,Evans, P.R.,Teo, C.H.,Nagai, K.
(1994) Nature 372: 432
- Crystal structure of human spliceosomal U1 snRNP at 5.5 A resolution.
Pomeranz Krummel, D.A.,Oubridge, C.,Leung, A.K.,Li, J.,Nagai, K.
(2009) Nature 458: 475
U1 snRNP binds to the 5' exon-intron junction of pre-mRNA and thus plays a crucial role at an early stage of pre-mRNA splicing. We present two crystal structures of engineered U1 sub-structures, which together reveal at atomic resolution an almost co ...
U1 snRNP binds to the 5' exon-intron junction of pre-mRNA and thus plays a crucial role at an early stage of pre-mRNA splicing. We present two crystal structures of engineered U1 sub-structures, which together reveal at atomic resolution an almost complete network of protein-protein and RNA-protein interactions within U1 snRNP, and show how the 5' splice site of pre-mRNA is recognised by U1 snRNP. The zinc-finger of U1-C interacts with the duplex between pre-mRNA and the 5'-end of U1 snRNA. The binding of the RNA duplex is stabilized by hydrogen bonds and electrostatic interactions between U1-C and the RNA backbone around the splice junction but U1-C makes no base-specific contacts with pre-mRNA. The structure, together with RNA binding assays, shows that the selection of 5'-splice site nucleotides by U1 snRNP is achieved predominantly through basepairing with U1 snRNA whilst U1-C fine-tunes relative affinities of mismatched 5'-splice sites.
Structural Studies Division, MRC Laboratory of Molecular Biology, Cambridge, United Kingdom.