2xb2

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<StructureSection load='2xb2' size='340' side='right'caption='[[2xb2]], [[Resolution|resolution]] 3.40&Aring;' scene=''>
<StructureSection load='2xb2' size='340' side='right'caption='[[2xb2]], [[Resolution|resolution]] 3.40&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[2xb2]] is a 13 chain structure with sequence from [https://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2XB2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2XB2 FirstGlance]. <br>
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<table><tr><td colspan='2'>[[2xb2]] is a 13 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2XB2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2XB2 FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ANP:PHOSPHOAMINOPHOSPHONIC+ACID-ADENYLATE+ESTER'>ANP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.4&#8491;</td></tr>
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<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1uw4|1uw4]], [[2j0u|2j0u]], [[2j0s|2j0s]], [[1p27|1p27]], [[2j0q|2j0q]]</div></td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ANP:PHOSPHOAMINOPHOSPHONIC+ACID-ADENYLATE+ESTER'>ANP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=2xb2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2xb2 OCA], [https://pdbe.org/2xb2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2xb2 RCSB], [https://www.ebi.ac.uk/pdbsum/2xb2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2xb2 ProSAT]</span></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=2xb2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2xb2 OCA], [https://pdbe.org/2xb2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2xb2 RCSB], [https://www.ebi.ac.uk/pdbsum/2xb2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2xb2 ProSAT]</span></td></tr>
</table>
</table>
== Disease ==
== Disease ==
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[[https://www.uniprot.org/uniprot/REN3B_HUMAN REN3B_HUMAN]] FG syndrome;X-linked intellectual disability with marfanoid habitus;X-linked non-syndromic intellectual disability. The disease is caused by mutations affecting the gene represented in this entry.<ref>PMID:17704778</ref>
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[https://www.uniprot.org/uniprot/REN3B_HUMAN REN3B_HUMAN] FG syndrome;X-linked intellectual disability with marfanoid habitus;X-linked non-syndromic intellectual disability. The disease is caused by mutations affecting the gene represented in this entry.<ref>PMID:17704778</ref>
== Function ==
== Function ==
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[[https://www.uniprot.org/uniprot/REN3B_HUMAN REN3B_HUMAN]] Involved in nonsense-mediated decay (NMD) of mRNAs containing premature stop codons by associating with the nuclear exon junction complex (EJC) and serving as link between the EJC core and NMD machinery. Recruits UPF2 at the cytoplasmic side of the nuclear envelope and the subsequent formation of an UPF1-UPF2-UPF3 surveillance complex (including UPF1 bound to release factors at the stalled ribosome) is believed to activate NMD. In cooperation with UPF2 stimulates both ATPase and RNA helicase activities of UPF1. Binds spliced mRNA upstream of exon-exon junctions. In vitro, stimulates translation; the function is independent of association with UPF2 and components of the EJC core.<ref>PMID:11163187</ref> <ref>PMID:12718880</ref> <ref>PMID:16209946</ref> <ref>PMID:16601204</ref> <ref>PMID:18066079</ref> [[https://www.uniprot.org/uniprot/IF4A3_HUMAN IF4A3_HUMAN]] ATP-dependent RNA helicase. Component of a splicing-dependent multiprotein exon junction complex (EJC) deposited at splice junction on mRNAs. The EJC is a dynamic structure consisting of a few core proteins and several more peripheral nuclear and cytoplasmic associated factors that join the complex only transiently either during EJC assembly or during subsequent mRNA metabolism. Core components of the EJC, that remains bound to spliced mRNAs throughout all stages of mRNA metabolism, functions to mark the position of the exon-exon junction in the mature mRNA and thereby influences downstream processes of gene expression including mRNA splicing, nuclear mRNA export, subcellular mRNA localization, translation efficiency and nonsense-mediated mRNA decay (NMD). Constitutes at least part of the platform anchoring other EJC proteins to spliced mRNAs. Its RNA-dependent ATPase and RNA-helicase activities are induced by CASC3, but abolished in presence of the MAGOH/RBM8A heterodimer, thereby trapping the ATP-bound EJC core onto spliced mRNA in a stable conformation. The inhibition of ATPase activity by the MAGOH/RBM8A heterodimer increases the RNA-binding affinity of the EJC. Involved in translational enhancement of spliced mRNAs after formation of the 80S ribosome complex. Binds spliced mRNA in sequence-independent manner, 20-24 nucleotides upstream of mRNA exon-exon junctions. Shows higher affinity for single-stranded RNA in an ATP-bound core EJC complex than after the ATP is hydrolyzed.<ref>PMID:15034551</ref> <ref>PMID:16209946</ref> <ref>PMID:16170325</ref> <ref>PMID:17375189</ref> <ref>PMID:19409878</ref> [[https://www.uniprot.org/uniprot/RBM8A_HUMAN RBM8A_HUMAN]] Component of a splicing-dependent multiprotein exon junction complex (EJC) deposited at splice junction on mRNAs. The EJC is a dynamic structure consisting of a few core proteins and several more peripheral nuclear and cytoplasmic associated factors that join the complex only transiently either during EJC assembly or during subsequent mRNA metabolism. Core components of the EJC, that remains bound to spliced mRNAs throughout all stages of mRNA metabolism, functions to mark the position of the exon-exon junction in the mature mRNA and thereby influences downstream processes of gene expression including mRNA splicing, nuclear mRNA export, subcellular mRNA localization, translation efficiency and nonsense-mediated mRNA decay (NMD). The heterodimer MAGOH-RBM8A interacts with PYM that function to enhance the translation of EJC-bearing spliced mRNAs by recruiting them to the ribosomal 48S preinitiation complex. Remains associated with mRNAs in the cytoplasm until the mRNAs engage the translation machinery. Its removal from cytoplasmic mRNAs requires translation initiation from EJC-bearing spliced mRNAs. Associates preferentially with mRNAs produced by splicing. Does not interact with pre-mRNAs, introns, or mRNAs produced from intronless cDNAs. Associates with both nuclear mRNAs and newly exported cytoplasmic mRNAs. Complex with MAGOH is a component of the nonsense mediated decay (NMD) pathway.<ref>PMID:12121612</ref> <ref>PMID:12718880</ref> <ref>PMID:12730685</ref> <ref>PMID:16209946</ref> <ref>PMID:19409878</ref> [[https://www.uniprot.org/uniprot/CASC3_HUMAN CASC3_HUMAN]] Component of a splicing-dependent multiprotein exon junction complex (EJC) deposited at splice junction on mRNAs. The EJC is a dynamic structure consisting of a few core proteins and several more peripheral nuclear and cytoplasmic associated factors that join the complex only transiently either during EJC assembly or during subsequent mRNA metabolism. Core components of the EJC, that remains bound to spliced mRNAs throughout all stages of mRNA metabolism, functions to mark the position of the exon-exon junction in the mature mRNA and thereby influences downstream processes of gene expression including mRNA splicing, nuclear mRNA export, subcellular mRNA localization, translation efficiency and nonsense-mediated mRNA decay (NMD). Stimulates the ATPase and RNA-helicase activities of EIF4A3. Plays a role in the stress response by participating in cytoplasmic stress granules assembly and by favoring cell recovery following stress. Component of the dendritic ribonucleoprotein particles (RNPs) in hippocampal neurons (By similarity). May play a role in mRNA transport (By similarity). Binds spliced mRNA in sequence-independent manner, 20-24 nucleotides upstream of mRNA exon-exon junctions. Binds poly(G) and poly(U) RNA homopolymer.<ref>PMID:17652158</ref> <ref>PMID:17375189</ref> [[https://www.uniprot.org/uniprot/MGN_HUMAN MGN_HUMAN]] Component of a splicing-dependent multiprotein exon junction complex (EJC) deposited at splice junction on mRNAs. The EJC is a dynamic structure consisting of a few core proteins and several more peripheral nuclear and cytoplasmic associated factors that join the complex only transiently either during EJC assembly or during subsequent mRNA metabolism. Core components of the EJC, that remains bound to spliced mRNAs throughout all stages of mRNA metabolism, functions to mark the position of the exon-exon junction in the mature mRNA and thereby influences downstream processes of gene expression including mRNA splicing, nuclear mRNA export, subcellular mRNA localization, translation efficiency and nonsense-mediated mRNA decay (NMD). Remains associated with the mRNA after its export to the cytoplasm and require translation of the mRNA for removal. The heterodimer MAGOH-RBM8A interacts with PYM that function to enhance the translation of EJC-bearing spliced mRNAs by recruiting them to the ribosomal 48S preinitiation complex.<ref>PMID:12730685</ref> <ref>PMID:16209946</ref>
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[https://www.uniprot.org/uniprot/REN3B_HUMAN REN3B_HUMAN] Involved in nonsense-mediated decay (NMD) of mRNAs containing premature stop codons by associating with the nuclear exon junction complex (EJC) and serving as link between the EJC core and NMD machinery. Recruits UPF2 at the cytoplasmic side of the nuclear envelope and the subsequent formation of an UPF1-UPF2-UPF3 surveillance complex (including UPF1 bound to release factors at the stalled ribosome) is believed to activate NMD. In cooperation with UPF2 stimulates both ATPase and RNA helicase activities of UPF1. Binds spliced mRNA upstream of exon-exon junctions. In vitro, stimulates translation; the function is independent of association with UPF2 and components of the EJC core.<ref>PMID:11163187</ref> <ref>PMID:12718880</ref> <ref>PMID:16209946</ref> <ref>PMID:16601204</ref> <ref>PMID:18066079</ref>
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Human]]
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[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Large Structures]]
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[[Category: Basquin, C]]
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[[Category: Synthetic construct]]
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[[Category: Bono, F]]
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[[Category: Basquin C]]
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[[Category: Buchwald, G]]
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[[Category: Bono F]]
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[[Category: Conti, E]]
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[[Category: Buchwald G]]
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[[Category: Ebert, J]]
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[[Category: Conti E]]
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[[Category: Hir, H Le]]
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[[Category: Ebert J]]
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[[Category: Jayachandran, U]]
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[[Category: Jayachandran U]]
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[[Category: Sauliere, J]]
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[[Category: Le Hir H]]
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[[Category: Exon junction complex]]
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[[Category: Sauliere J]]
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[[Category: Hydrolase]]
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[[Category: Nonsense-mediated mrna decay]]
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[[Category: Translation]]
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[[Category: Upf3b]]
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Current revision

Crystal structure of the core Mago-Y14-eIF4AIII-Barentsz-UPF3b assembly shows how the EJC is bridged to the NMD machinery

PDB ID 2xb2

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