View source for 5kq4


==Crystal structure of S. pombe Dcp1/Dcp2 in complex with H. sapiens PNRC2 and synthetic cap analog==
<StructureSection load='5kq4' size='340' side='right'caption='[[5kq4]], [[Resolution|resolution]] 2.56&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5kq4]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Schizosaccharomyces_pombe_972h- Schizosaccharomyces pombe 972h-]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5KQ4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5KQ4 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.56&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=6VQ:[[(2~{R},3~{S},4~{R},5~{R})-5-(2-AZANYL-7-METHYL-6-OXIDANYLIDENE-3~{H}-PURIN-7-IUM-9-YL)-3,4-BIS(OXIDANYL)OXOLAN-2-YL]METHOXY-SULFANYL-PHOSPHORYL]+[[[(2~{R},3~{S},4~{R},5~{R})-5-(2-AZANYL-7-METHYL-6-OXIDANYLIDENE-3~{H}-PURIN-7-IUM-9-YL)-3,4-BIS(OXIDANYL)OXOLAN-2-YL]METHOXY-SULFANYL-PHOSPHORYL]OXY-OXIDANYL-PHOSPHORYL]+HYDROGEN+PHOSPHATE'>6VQ</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=5kq4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5kq4 OCA], [https://pdbe.org/5kq4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5kq4 RCSB], [https://www.ebi.ac.uk/pdbsum/5kq4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5kq4 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DCP1_SCHPO DCP1_SCHPO] Component of the decapping complex necessary for the degradation of mRNAs, both in normal mRNA turnover and in nonsense-mediated mRNA decay. Removes the 7-methyl guanine cap structure from mRNA molecules, yielding a 5'-phosphorylated mRNA fragment and 7m-GDP. Decapping is the major pathway of mRNA degradation in yeast. It occurs through deadenylation, decapping and subsequent 5' to 3' exonucleolytic decay of the transcript body.<ref>PMID:15671491</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Removal of the 5' cap on mRNA by the decapping enzyme Dcp2 is a critical step in 5'-to-3' mRNA decay. Understanding the structural basis of Dcp2 activity has been a challenge because Dcp2 is dynamic and has weak affinity for the cap substrate. Here we present a 2.6-A-resolution crystal structure of a heterotrimer of fission yeast Dcp2, its essential activator Dcp1, and the human NMD cofactor PNRC2, in complex with a tight-binding cap analog. Cap binding is accompanied by a conformational change in Dcp2, thereby forming a composite nucleotide-binding site comprising conserved residues in the catalytic and regulatory domains. Kinetic analysis of PNRC2 revealed that a conserved short linear motif enhances both substrate affinity and the catalytic step of decapping. These findings explain why Dcp2 requires a conformational change for efficient catalysis and reveals that coactivators promote RNA binding and the catalytic step of decapping, possibly through different conformational states.

Structural basis of mRNA-cap recognition by Dcp1-Dcp2.,Mugridge JS, Ziemniak M, Jemielity J, Gross JD Nat Struct Mol Biol. 2016 Oct 3. doi: 10.1038/nsmb.3301. PMID:27694842<ref>PMID:27694842</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5kq4" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Schizosaccharomyces pombe 972h-]]
[[Category: Gross JD]]
[[Category: Jemielity J]]
[[Category: Mugridge JS]]
[[Category: Ziemniak M]]