View source for 5gan


==The overall structure of the yeast spliceosomal U4/U6.U5 tri-snRNP at 3.7 Angstrom==
<SX load='5gan' size='340' side='right' viewer='molstar' caption='[[5gan]], [[Resolution|resolution]] 3.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5gan]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5GAN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5GAN FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5gan FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5gan OCA], [https://pdbe.org/5gan PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5gan RCSB], [https://www.ebi.ac.uk/pdbsum/5gan PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5gan ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PRP8_YEAST PRP8_YEAST] Required for pre-spliceosome formation, which is the first step of pre-mRNA splicing. This protein is associated with snRNP U5. Has a role in branch site-3' splice site selection. Associates with the branch site-3' splice 3'-exon region. Also has a role in cell cycle.<ref>PMID:2835658</ref> <ref>PMID:9150140</ref> <ref>PMID:12773561</ref> <ref>PMID:18779563</ref> 
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== Publication Abstract from PubMed ==
U4/U6.U5 tri-snRNP represents a substantial part of the spliceosome before activation. A cryo-electron microscopy structure of Saccharomyces cerevisiae U4/U6.U5 tri-snRNP at 3.7 A resolution led to an essentially complete atomic model comprising 30 proteins plus U4/U6 and U5 small nuclear RNAs (snRNAs). The structure reveals striking interweaving interactions of the protein and RNA components, including extended polypeptides penetrating into subunit interfaces. The invariant ACAGAGA sequence of U6 snRNA, which base-pairs with the 5'-splice site during catalytic activation, forms a hairpin stabilized by Dib1 and Prp8 while the adjacent nucleotides interact with the exon binding loop 1 of U5 snRNA. Snu114 harbours GTP, but its putative catalytic histidine is held away from the gamma-phosphate by hydrogen bonding to a tyrosine in the amino-terminal domain of Prp8. Mutation of this histidine to alanine has no detectable effect on yeast growth. The structure provides important new insights into the spliceosome activation process leading to the formation of the catalytic centre.

Cryo-EM structure of the yeast U4/U6.U5 tri-snRNP at 3.7 A resolution.,Nguyen TH, Galej WP, Bai XC, Oubridge C, Newman AJ, Scheres SH, Nagai K Nature. 2016 Feb 18;530(7590):298-302. doi: 10.1038/nature16940. Epub 2016 Feb 1. PMID:26829225<ref>PMID:26829225</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 5gan" style="background-color:#fffaf0;"></div>

==See Also==
*[[Helicase 3D structures|Helicase 3D structures]]
*[[Pre-mRNA splicing factors 3D structures|Pre-mRNA splicing factors 3D structures]]
*[[Sm-like protein|Sm-like protein]]
== References ==
<references/>
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[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Bai XC]]
[[Category: Galej WP]]
[[Category: Nagai K]]
[[Category: Newman AJ]]
[[Category: Nguyen THD]]
[[Category: Oubridge C]]
[[Category: Scheres SHW]]