View source for 5mqf


==Cryo-EM structure of a human spliceosome activated for step 2 of splicing (C* complex)==
<SX load='5mqf' size='340' side='right' viewer='molstar' caption='[[5mqf]], [[Resolution|resolution]] 5.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5mqf]] is a 11 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5MQF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5MQF 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]] 5.9&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</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=5mqf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5mqf OCA], [https://pdbe.org/5mqf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5mqf RCSB], [https://www.ebi.ac.uk/pdbsum/5mqf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5mqf ProSAT]</span></td></tr>
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== Function ==
[https://www.uniprot.org/uniprot/PPIE_HUMAN PPIE_HUMAN] PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. Combines RNA-binding and PPIase activities. May be involved in muscle- and brain-specific processes. May be involved in pre-mRNA splicing.
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== Publication Abstract from PubMed ==
Spliceosome rearrangements facilitated by RNA helicase PRP16 before catalytic step two of splicing are poorly understood. Here we report a 3D cryo-electron microscopy structure of the human spliceosomal C complex stalled directly after PRP16 action (C*). The architecture of the catalytic U2-U6 ribonucleoprotein (RNP) core of the human C* spliceosome is very similar to that of the yeast pre-Prp16 C complex. However, in C* the branched intron region is separated from the catalytic centre by approximately 20 A, and its position close to the U6 small nuclear RNA ACAGA box is stabilized by interactions with the PRP8 RNase H-like and PRP17 WD40 domains. RNA helicase PRP22 is located about 100 A from the catalytic centre, suggesting that it destabilizes the spliced mRNA after step two from a distance. Comparison of the structure of the yeast C and human C* complexes reveals numerous RNP rearrangements that are likely to be facilitated by PRP16, including a large-scale movement of the U2 small nuclear RNP.

Cryo-EM structure of a human spliceosome activated for step 2 of splicing.,Bertram K, Agafonov DE, Liu WT, Dybkov O, Will CL, Hartmuth K, Urlaub H, Kastner B, Stark H, Luhrmann R Nature. 2017 Feb 16;542(7641):318-323. doi: 10.1038/nature21079. Epub 2017 Jan, 11. PMID:28076346<ref>PMID:28076346</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 5mqf" style="background-color:#fffaf0;"></div>

==See Also==
*[[Eukaryotic initiation factor 3D structures|Eukaryotic initiation factor 3D structures]]
*[[Helicase 3D structures|Helicase 3D structures]]
*[[Pre-mRNA splicing factors 3D structures|Pre-mRNA splicing factors 3D structures]]
*[[Sm-like protein 3D structures|Sm-like protein 3D structures]]
== References ==
<references/>
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[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Bertram K]]
[[Category: Hartmuth K]]
[[Category: Kastner B]]