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| | <StructureSection load='2iyk' size='340' side='right'caption='[[2iyk]], [[Resolution|resolution]] 2.95Å' scene=''> | | <StructureSection load='2iyk' size='340' side='right'caption='[[2iyk]], [[Resolution|resolution]] 2.95Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2iyk]] is a 2 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=2IYK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2IYK FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2iyk]] is a 2 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=2IYK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2IYK FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.95Å</td></tr> |
| | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</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=2iyk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2iyk OCA], [https://pdbe.org/2iyk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2iyk RCSB], [https://www.ebi.ac.uk/pdbsum/2iyk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2iyk 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=2iyk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2iyk OCA], [https://pdbe.org/2iyk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2iyk RCSB], [https://www.ebi.ac.uk/pdbsum/2iyk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2iyk ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/RENT1_HUMAN RENT1_HUMAN] RNA-dependent helicase and ATPase required for nonsense-mediated decay (NMD) of mRNAs containing premature stop codons. Is recruited to mRNAs upon translation termination and undergoes a cycle of phosphorylation and dephosphorylation; its phosphorylation appears to be a key step in NMD. Recruited by release factors to stalled ribosomes together with the SMG1C protein kinase complex to form the transient SURF (SMG1-UPF1-eRF1-eRF3) complex. In EJC-dependent NMD, the SURF complex associates with the exon junction complex (EJC) (located 50-55 or more nucleotides downstream from the termination codon) through UPF2 and allows the formation of an UPF1-UPF2-UPF3 surveillance complex which is believed to activate NMD. Phosphorylated UPF1 is recognized by EST1B/SMG5, SMG6 and SMG7 which are thought to provide a link to the mRNA degradation machinery involving exonucleolytic and endonucleolytic pathways, and to serve as adapters to protein phosphatase 2A (PP2A), thereby triggering UPF1 dephosphorylation and allowing the recycling of NMD factors. UPF1 can also activate NMD without UPF2 or UPF3, and in the absence of the NMD-enhancing downstream EJC indicative for alternative NMD pathways. Plays a role in replication-dependent histone mRNA degradation at the end of phase S; the function is independent of UPF2. For the recognition of premature termination codons (PTC) and initiation of NMD a competitive interaction between UPF1 and PABPC1 with the ribosome-bound release factors is proposed. The ATPase activity of UPF1 is required for disassembly of mRNPs undergoing NMD. Essential for embryonic viability.<ref>PMID:11163187</ref> <ref>PMID:16086026</ref> <ref>PMID:18172165</ref> <ref>PMID:21145460</ref> <ref>PMID:21419344</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> |
| - | [[Category: Human]] | + | [[Category: Homo sapiens]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Cusack, S]] | + | [[Category: Cusack S]] |
| - | [[Category: Guilligay, D]] | + | [[Category: Guilligay D]] |
| - | [[Category: Kadlec, J]] | + | [[Category: Kadlec J]] |
| - | [[Category: Ravelli, R B]] | + | [[Category: Ravelli RB]] |
| - | [[Category: Alternative splicing]]
| + | |
| - | [[Category: Atp-binding]]
| + | |
| - | [[Category: Helicase]]
| + | |
| - | [[Category: Hydrolase]]
| + | |
| - | [[Category: Metal-binding]]
| + | |
| - | [[Category: Nmd]]
| + | |
| - | [[Category: Nonsense mediated mrna decay]]
| + | |
| - | [[Category: Nonsense-mediated mrna decay]]
| + | |
| - | [[Category: Nucleotide-binding]]
| + | |
| - | [[Category: Phosphorylation]]
| + | |
| - | [[Category: Surveillance complex]]
| + | |
| - | [[Category: Upf1]]
| + | |
| - | [[Category: Zinc]]
| + | |
| - | [[Category: Zinc-finger]]
| + | |
| Structural highlights
Function
RENT1_HUMAN RNA-dependent helicase and ATPase required for nonsense-mediated decay (NMD) of mRNAs containing premature stop codons. Is recruited to mRNAs upon translation termination and undergoes a cycle of phosphorylation and dephosphorylation; its phosphorylation appears to be a key step in NMD. Recruited by release factors to stalled ribosomes together with the SMG1C protein kinase complex to form the transient SURF (SMG1-UPF1-eRF1-eRF3) complex. In EJC-dependent NMD, the SURF complex associates with the exon junction complex (EJC) (located 50-55 or more nucleotides downstream from the termination codon) through UPF2 and allows the formation of an UPF1-UPF2-UPF3 surveillance complex which is believed to activate NMD. Phosphorylated UPF1 is recognized by EST1B/SMG5, SMG6 and SMG7 which are thought to provide a link to the mRNA degradation machinery involving exonucleolytic and endonucleolytic pathways, and to serve as adapters to protein phosphatase 2A (PP2A), thereby triggering UPF1 dephosphorylation and allowing the recycling of NMD factors. UPF1 can also activate NMD without UPF2 or UPF3, and in the absence of the NMD-enhancing downstream EJC indicative for alternative NMD pathways. Plays a role in replication-dependent histone mRNA degradation at the end of phase S; the function is independent of UPF2. For the recognition of premature termination codons (PTC) and initiation of NMD a competitive interaction between UPF1 and PABPC1 with the ribosome-bound release factors is proposed. The ATPase activity of UPF1 is required for disassembly of mRNPs undergoing NMD. Essential for embryonic viability.[1] [2] [3] [4] [5]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
UPF1 is an essential eukaryotic RNA helicase that plays a key role in various mRNA degradation pathways, notably nonsense-mediated mRNA decay (NMD). In combination with UPF2 and UPF3, it forms part of the surveillance complex that detects mRNAs containing premature stop codons and triggers their degradation in all organisms studied from yeast to human. We describe the 3 A resolution crystal structure of the highly conserved cysteine-histidine-rich domain of human UPF1 and show that it is a unique combination of three zinc-binding motifs arranged into two tandem modules related to the RING-box and U-box domains of ubiquitin ligases. This UPF1 domain interacts with UPF2, and we identified by mutational analysis residues in two distinct conserved surface regions of UPF1 that mediate this interaction. UPF1 residues we identify as important for the interaction with UPF2 are not conserved in UPF1 homologs from certain unicellular parasites that also appear to lack UPF2 in their genomes.
Crystal structure of the UPF2-interacting domain of nonsense-mediated mRNA decay factor UPF1.,Kadlec J, Guilligay D, Ravelli RB, Cusack S RNA. 2006 Oct;12(10):1817-24. Epub 2006 Aug 24. PMID:16931876[6]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Lykke-Andersen J, Shu MD, Steitz JA. Human Upf proteins target an mRNA for nonsense-mediated decay when bound downstream of a termination codon. Cell. 2000 Dec 22;103(7):1121-31. PMID:11163187
- ↑ Kaygun H, Marzluff WF. Regulated degradation of replication-dependent histone mRNAs requires both ATR and Upf1. Nat Struct Mol Biol. 2005 Sep;12(9):794-800. Epub 2005 Aug 7. PMID:16086026 doi:http://dx.doi.org/10.1038/nsmb972
- ↑ Mullen TE, Marzluff WF. Degradation of histone mRNA requires oligouridylation followed by decapping and simultaneous degradation of the mRNA both 5' to 3' and 3' to 5'. Genes Dev. 2008 Jan 1;22(1):50-65. doi: 10.1101/gad.1622708. PMID:18172165 doi:10.1101/gad.1622708
- ↑ Franks TM, Singh G, Lykke-Andersen J. Upf1 ATPase-dependent mRNP disassembly is required for completion of nonsense- mediated mRNA decay. Cell. 2010 Dec 10;143(6):938-50. doi: 10.1016/j.cell.2010.11.043. PMID:21145460 doi:http://dx.doi.org/10.1016/j.cell.2010.11.043
- ↑ Chakrabarti S, Jayachandran U, Bonneau F, Fiorini F, Basquin C, Domcke S, Le Hir H, Conti E. Molecular Mechanisms for the RNA-Dependent ATPase Activity of Upf1 and Its Regulation by Upf2. Mol Cell. 2011 Mar 18;41(6):693-703. PMID:21419344 doi:10.1016/j.molcel.2011.02.010
- ↑ Kadlec J, Guilligay D, Ravelli RB, Cusack S. Crystal structure of the UPF2-interacting domain of nonsense-mediated mRNA decay factor UPF1. RNA. 2006 Oct;12(10):1817-24. Epub 2006 Aug 24. PMID:16931876 doi:http://dx.doi.org/10.1261/rna.177606
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