View source for 9gcm


==Structure of the U11 snRNP core==
<StructureSection load='9gcm' size='340' side='right'caption='[[9gcm]], [[Resolution|resolution]] 3.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9gcm]] is a 4 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=9GCM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9GCM 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]] 3.1&#8491;</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=9gcm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9gcm OCA], [https://pdbe.org/9gcm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9gcm RCSB], [https://www.ebi.ac.uk/pdbsum/9gcm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9gcm ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/SNR25_HUMAN SNR25_HUMAN] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The minor spliceosome catalyzes excision of U12-dependent introns from precursors of eukaryotic messenger RNAs (pre-mRNAs). This process is critical for many cellular functions, but the underlying molecular mechanisms remain elusive. Here, we report a cryoelectron microscopy (cryo-EM) reconstruction of the 13-subunit human U11 small nuclear ribonucleoprotein particle (snRNP) complex in apo and substrate-bound forms, revealing the architecture of the U11 small nuclear RNA (snRNA), five minor spliceosome-specific factors, and the mechanism of the U12-type 5' splice site (5'SS) recognition. SNRNP25 and SNRNP35 specifically recognize U11 snRNA, while PDCD7 bridges SNRNP25 and SNRNP48, located at the distal ends of the particle. SNRNP48 and ZMAT5 are positioned near the 5' end of U11 snRNA and stabilize binding of the incoming 5'SS. Recognition of the U12-type 5'SS is achieved through base-pairing to the 5' end of the U11 snRNA and unexpected, non-canonical base-triple interactions with the U11 snRNA stem-loop 3. Our structures provide mechanistic insights into U12-dependent intron recognition and the evolution of the splicing machinery.

Structural basis of 5' splice site recognition by the minor spliceosome.,Zhao J, Peter D, Brandina I, Liu X, Galej WP Mol Cell. 2025 Jan 13:S1097-2765(24)01034-7. doi: 10.1016/j.molcel.2024.12.017. PMID:39809272<ref>PMID:39809272</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9gcm" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Galej WP]]
[[Category: Zhao J]]