3zjy

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{{STRUCTURE_3zjy| PDB=3zjy | SCENE= }}
 
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===Crystal Structure of Importin 13 - RanGTP - eIF1A complex===
 
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{{ABSTRACT_PUBMED_23435562}}
 
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==Function==
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==Crystal Structure of Importin 13 - RanGTP - eIF1A complex==
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[[http://www.uniprot.org/uniprot/RAN_HUMAN RAN_HUMAN]] GTP-binding protein involved in nucleocytoplasmic transport. Required for the import of protein into the nucleus and also for RNA export. Involved in chromatin condensation and control of cell cycle (By similarity). The complex with BIRC5/ survivin plays a role in mitotic spindle formation by serving as a physical scaffold to help deliver the RAN effector molecule TPX2 to microtubules. Acts as a negative regulator of the kinase activity of VRK1 and VRK2.<ref>PMID:10400640</ref> <ref>PMID:8692944</ref> <ref>PMID:18591255</ref> <ref>PMID:18617507</ref> Enhances AR-mediated transactivation. Transactivation decreases as the poly-Gln length within AR increases.<ref>PMID:10400640</ref> <ref>PMID:8692944</ref> <ref>PMID:18591255</ref> <ref>PMID:18617507</ref> [[http://www.uniprot.org/uniprot/IF1AX_HUMAN IF1AX_HUMAN]] Seems to be required for maximal rate of protein biosynthesis. Enhances ribosome dissociation into subunits and stabilizes the binding of the initiator Met-tRNA(I) to 40 S ribosomal subunits. [[http://www.uniprot.org/uniprot/IPO13_HUMAN IPO13_HUMAN]] Functions in nuclear protein import as nuclear transport receptor. Serves as receptor for nuclear localization signals (NLS) in cargo substrates. Is thought to mediate docking of the importin/substrate complex to the nuclear pore complex (NPC) through binding to nucleoporin and the complex is subsequently translocated through the pore by an energy requiring, Ran-dependent mechanism. At the nucleoplasmic side of the NPC, Ran binds to the importin, the importin/substrate complex dissociates and importin is re-exported from the nucleus to the cytoplasm where GTP hydrolysis releases Ran. The directionality of nuclear import is thought to be conferred by an asymmetric distribution of the GTP- and GDP-bound forms of Ran between the cytoplasm and nucleus (By similarity). Mediates the nuclear import of UBC9, the RBM8A/MAGOH complex, PAX6 and probably other members of the paired homeobox family. Also mediates nuclear export of eIF-1A, and the cytoplasmic release of eIF-1A is triggered by the loading of import substrates onto IPO13.<ref>PMID:11447110</ref> <ref>PMID:15143176</ref>
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<StructureSection load='3zjy' size='340' side='right'caption='[[3zjy]], [[Resolution|resolution]] 3.60&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[3zjy]] is a 7 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=3ZJY OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3ZJY FirstGlance]. <br>
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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]] 3.6&#8491;</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=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3zjy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3zjy OCA], [https://pdbe.org/3zjy PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3zjy RCSB], [https://www.ebi.ac.uk/pdbsum/3zjy PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3zjy ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/RAN_HUMAN RAN_HUMAN] GTP-binding protein involved in nucleocytoplasmic transport. Required for the import of protein into the nucleus and also for RNA export. Involved in chromatin condensation and control of cell cycle (By similarity). The complex with BIRC5/ survivin plays a role in mitotic spindle formation by serving as a physical scaffold to help deliver the RAN effector molecule TPX2 to microtubules. Acts as a negative regulator of the kinase activity of VRK1 and VRK2.<ref>PMID:10400640</ref> <ref>PMID:8692944</ref> <ref>PMID:18591255</ref> <ref>PMID:18617507</ref> Enhances AR-mediated transactivation. Transactivation decreases as the poly-Gln length within AR increases.<ref>PMID:10400640</ref> <ref>PMID:8692944</ref> <ref>PMID:18591255</ref> <ref>PMID:18617507</ref>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Importin13 (Imp13) is a bidirectional karyopherin that can mediate both import and export of cargoes. Imp13 recognizes several import cargoes, which include the exon junction complex components Mago-Y14 and the E2 SUMO-conjugating enzyme Ubc9, and one known export cargo, the translation initiation factor 1A (eIF1A). To understand how Imp13 can perform double duty, we determined the 3.6-A crystal structure of Imp13 in complex with RanGTP and with eIF1A. eIF1A binds at the inner surface of the Imp13 C-terminal arch adjacent and concomitantly to RanGTP illustrating how eIF1A can be exported by Imp13. Moreover, the 3.0-A structure of Imp13 in its unbound state reveals the existence of an open conformation in the cytoplasm that explains export cargo release and completes the export branch of the Imp13 pathway. Finally, we demonstrate that Imp13 is able to bind and export eIF1A in vivo and that its function is essential.
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==About this Structure==
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Structural basis for the nuclear export activity of Importin13.,Grunwald M, Lazzaretti D, Bono F EMBO J. 2013 Mar 20;32(6):899-913. doi: 10.1038/emboj.2013.29. Epub 2013 Feb 22. PMID:23435562<ref>PMID:23435562</ref>
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[[3zjy]] is a 7 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3ZJY OCA].
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==Reference==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<references group="xtra"/><references/>
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</div>
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<div class="pdbe-citations 3zjy" style="background-color:#fffaf0;"></div>
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==See Also==
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*[[Eukaryotic initiation factor 3D structures|Eukaryotic initiation factor 3D structures]]
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*[[GTP-binding protein 3D structures|GTP-binding protein 3D structures]]
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*[[Importin 3D structures|Importin 3D structures]]
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== References ==
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<references/>
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Bono, F.]]
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[[Category: Large Structures]]
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[[Category: Gruenwald, M.]]
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[[Category: Bono F]]
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[[Category: Lazzaretti, D.]]
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[[Category: Gruenwald M]]
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[[Category: Active transport]]
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[[Category: Lazzaretti D]]
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[[Category: Cell nucleus]]
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[[Category: Multiprotein complex]]
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[[Category: Nucleocytoplasmic transport]]
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[[Category: Ran gtp-binding protein]]
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[[Category: Rna-binding protein]]
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[[Category: Translation]]
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Crystal Structure of Importin 13 - RanGTP - eIF1A complex

PDB ID 3zjy

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