4kxt: Difference between revisions

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== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[4kxt]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Spodoptera_frugiperda Spodoptera frugiperda]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4KXT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4KXT FirstGlance]. <br>
<table><tr><td colspan='2'>[[4kxt]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Spodoptera_frugiperda Spodoptera frugiperda]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4KXT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4KXT FirstGlance]. <br>
</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=4kxt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kxt OCA], [https://pdbe.org/4kxt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4kxt RCSB], [https://www.ebi.ac.uk/pdbsum/4kxt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4kxt ProSAT]</span></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]] 2.294&#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=4kxt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kxt OCA], [https://pdbe.org/4kxt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4kxt RCSB], [https://www.ebi.ac.uk/pdbsum/4kxt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4kxt ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[https://www.uniprot.org/uniprot/AGO1_HUMAN AGO1_HUMAN] Required for RNA-mediated gene silencing (RNAi). Binds to short RNAs such as microRNAs (miRNAs) or short interfering RNAs (siRNAs), and represses the translation of mRNAs which are complementary to them. Lacks endonuclease activity and does not appear to cleave target mRNAs. Also required for transcriptional gene silencing (TGS) of promoter regions which are complementary to bound short antigene RNAs (agRNAs).<ref>PMID:16289642</ref> <ref>PMID:16936728</ref> <ref>PMID:18771919</ref>  
[https://www.uniprot.org/uniprot/AGO1_HUMAN AGO1_HUMAN] Required for RNA-mediated gene silencing (RNAi). Binds to short RNAs such as microRNAs (miRNAs) or short interfering RNAs (siRNAs), and represses the translation of mRNAs which are complementary to them. Lacks endonuclease activity and does not appear to cleave target mRNAs. Also required for transcriptional gene silencing (TGS) of promoter regions which are complementary to bound short antigene RNAs (agRNAs).<ref>PMID:16289642</ref> <ref>PMID:16936728</ref> <ref>PMID:18771919</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
We have solved the crystal structure of human ARGONAUTE1 (hAGO1) bound to endogenous 5'-phosphorylated guide RNAs. To identify changes that evolutionarily rendered hAGO1 inactive, we compared our structure with guide-RNA-containing and cleavage-active hAGO2. Aside from mutation of a catalytic tetrad residue, proline residues at positions 670 and 675 in hAGO1 introduce a kink in the cS7 loop, forming a convex surface within the hAGO1 nucleic-acid-binding channel near the inactive catalytic site. We predicted that even upon restoration of the catalytic tetrad, hAGO1-cS7 sterically hinders the placement of a fully paired guide-target RNA duplex into the endonuclease active site. Consistent with this hypothesis, reconstitution of the catalytic tetrad with R805H led to low-level hAGO1 cleavage activity, whereas combining R805H with cS7 substitutions P670S and P675Q substantially augmented hAGO1 activity. Evolutionary amino acid changes to hAGO1 were readily reversible, suggesting that loading of guide RNA and pairing of seed-based miRNA and target RNA constrain its sequence drift.
Eukaryote-Specific Insertion Elements Control Human ARGONAUTE Slicer Activity.,Nakanishi K, Ascano M, Gogakos T, Ishibe-Murakami S, Serganov AA, Briskin D, Morozov P, Tuschl T, Patel DJ Cell Rep. 2013 Jun 27;3(6):1893-900. doi: 10.1016/j.celrep.2013.06.010. PMID:23809764<ref>PMID:23809764</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 4kxt" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
Retrieved from "https://proteopedia.org/4kxt"