View source for 4wyq


==Crystal structure of the Dicer-TRBP interface==
<StructureSection load='4wyq' size='340' side='right'caption='[[4wyq]], [[Resolution|resolution]] 3.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4wyq]] is a 6 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=4WYQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4WYQ 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]] 3.2&#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=4wyq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4wyq OCA], [https://pdbe.org/4wyq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4wyq RCSB], [https://www.ebi.ac.uk/pdbsum/4wyq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4wyq ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/DICER_HUMAN DICER_HUMAN] Defects in DICER1 are a cause of pleuropulmonary blastoma (PPB) [MIM:[https://omim.org/entry/601200 601200]. PPB is a rare pediatric tumor of the lung that arises during fetal lung development and is often part of an inherited cancer syndrome. PPBs contain both epithelial and mesenchymal cells. Early in tumorigenesis, cysts form in lung airspaces, and these cysts are lined with benign-appearing epithelium. Mesenchymal cells susceptible to malignant transformation reside within the cyst walls and form a dense 'cambium' layer beneath the epithelial lining. In a subset of patients, overgrowth of the mesenchymal cells produces a sarcoma, a transition that is associated with a poorer prognosis.<ref>PMID:21882293</ref> <ref>PMID:19556464</ref>   Defects in DICER1 are the cause of goiter multinodular type 1 with or without Sertoli-Leydig cell tumors (MNG1) [MIM:[https://omim.org/entry/138800 138800]. A common disorder characterized by nodular overgrowth of the thyroid gland. Some individuals may also develop Sertoli-Leydig cell tumors, usually of the ovary.<ref>PMID:21882293</ref> <ref>PMID:21205968</ref>   Note=DICER1 mutations have been found in uterine cervix embryonal rhabdomyosarcoma, primitive neuroectodermal tumor, Wilms tumor, pulmonary sequestration and juvenile intestinal polyp (PubMed:21882293). Somatic missense mutations affecting the RNase IIIb domain of DICER1 are common in non-epithelial ovarian tumors. These mutations do not abolish DICER1 function but alter it in specific cell types, a novel mechanism through which perturbation of microRNA processing may be oncogenic (PubMed:22187960).<ref>PMID:21882293</ref> 
== Function ==
[https://www.uniprot.org/uniprot/DICER_HUMAN DICER_HUMAN] Required for formation of the RNA induced silencing complex (RISC). Component of the RISC loading complex (RLC), also known as the micro-RNA (miRNA) loading complex (miRLC), which is composed of DICER1, EIF2C2/AGO2 and TARBP2. Within the RLC/miRLC, DICER1 and TARBP2 are required to process precursor miRNAs (pre-miRNAs) to mature miRNAs and then load them onto EIF2C2/AGO2. EIF2C2/AGO2 bound to the mature miRNA constitutes the minimal RISC and may subsequently dissociate from DICER1 and TARBP2. Also cleaves double-stranded RNA to produce short interfering RNAs (siRNAs) which target the selective destruction of complementary RNAs.<ref>PMID:15242644</ref> <ref>PMID:16271387</ref> <ref>PMID:16289642</ref> <ref>PMID:16142218</ref> <ref>PMID:16357216</ref> <ref>PMID:15973356</ref> <ref>PMID:16424907</ref> <ref>PMID:17452327</ref> <ref>PMID:18178619</ref> <ref>PMID:19219043</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
RNA-mediated gene silencing in human cells requires the accurate generation of approximately 22 nt microRNAs (miRNAs) from double-stranded RNA substrates by the endonuclease Dicer. Although the phylogenetically conserved RNA-binding proteins TRBP and PACT are known to contribute to this process, their mode of Dicer binding and their genome-wide effects on miRNA processing have not been determined. We solved the crystal structure of the human Dicer-TRBP interface, revealing the structural basis of the interaction. Interface residues conserved between TRBP and PACT show that the proteins bind to Dicer in a similar manner and by mutual exclusion. Based on the structure, a catalytically active Dicer that cannot bind TRBP or PACT was designed and introduced into Dicer-deficient mammalian cells, revealing selective defects in guide strand selection. These results demonstrate the role of Dicer-associated RNA binding proteins in maintenance of gene silencing fidelity.

Dicer-TRBP Complex Formation Ensures Accurate Mammalian MicroRNA Biogenesis.,Wilson RC, Tambe A, Kidwell MA, Noland CL, Schneider CP, Doudna JA Mol Cell. 2014 Dec 30. pii: S1097-2765(14)00951-4. doi:, 10.1016/j.molcel.2014.11.030. PMID:25557550<ref>PMID:25557550</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4wyq" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ribonuclease 3D structures|Ribonuclease 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Doudna JA]]
[[Category: Wilson RC]]