View source for 7nh2


==Crystal structure of Toxoplasma CPSF4-YTH domain bound to m6A==
<StructureSection load='7nh2' size='340' side='right'caption='[[7nh2]], [[Resolution|resolution]] 1.35&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7nh2]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Toxoplasma_gondii_ME49 Toxoplasma gondii ME49]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7NH2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7NH2 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]] 1.35&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=OYK:~{N},9-dimethylpurin-6-amine'>OYK</scene>, <scene name='pdbligand=PG4:TETRAETHYLENE+GLYCOL'>PG4</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=7nh2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7nh2 OCA], [https://pdbe.org/7nh2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7nh2 RCSB], [https://www.ebi.ac.uk/pdbsum/7nh2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7nh2 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/S8F6K2_TOXGM S8F6K2_TOXGM] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Correct 3'end processing of mRNAs is one of the regulatory cornerstones of gene expression. In a parasite that must adapt to the regulatory requirements of its multi-host life style, there is a need to adopt additional means to partition the distinct transcriptional signatures of the closely and tandemly arranged stage-specific genes. In this study, we report our findings in T. gondii of an m6A-dependent 3'end polyadenylation serving as a transcriptional barrier at these loci. We identify the core polyadenylation complex within T. gondii and establish CPSF4 as a reader for m6A-modified mRNAs, via a YTH domain within its C-terminus, a feature which is shared with plants. We bring evidence of the specificity of this interaction both biochemically, and by determining the crystal structure at high resolution of the T. gondii CPSF4-YTH in complex with an m6A-modified RNA. We show that the loss of m6A, both at the level of its deposition or its recognition is associated with an increase in aberrantly elongated chimeric mRNAs emanating from impaired transcriptional termination, a phenotype previously noticed in the plant model Arabidopsis thaliana. Nanopore direct RNA sequencing shows the occurrence of transcriptional read-through breaching into downstream repressed stage-specific genes, in the absence of either CPSF4 or the m6A RNA methylase components in both T. gondii and A. thaliana. Taken together, our results shed light on an essential regulatory mechanism coupling the pathways of m6A metabolism directly to the cleavage and polyadenylation processes, one that interestingly seem to serve, in both T. gondii and A. thaliana, as a guardian against aberrant transcriptional read-throughs.

A plant-like mechanism coupling m6A reading to polyadenylation safeguards transcriptome integrity and developmental gene partitioning in Toxoplasma.,Farhat DC, Bowler MW, Communie G, Pontier D, Belmudes L, Mas C, Corrao C, Coute Y, Bougdour A, Lagrange T, Hakimi MA, Swale C Elife. 2021 Jul 15;10. pii: 68312. doi: 10.7554/eLife.68312. PMID:34263725<ref>PMID:34263725</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7nh2" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Toxoplasma gondii ME49]]
[[Category: Bowler MW]]
[[Category: Swale C]]