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[[Image:1xk5.gif|left|200px]]


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==Crystal structure of the m3G-cap-binding domain of snurportin1 in complex with a m3GpppG-cap dinucleotide==
The line below this paragraph, containing "STRUCTURE_1xk5", creates the "Structure Box" on the page.
<StructureSection load='1xk5' size='340' side='right'caption='[[1xk5]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[1xk5]] is a 1 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=1XK5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1XK5 FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.4&#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=TPG:2,2,7-TRIMETHYL-GUANOSINE-5-TRIPHOSPHATE-5-GUANOSINE'>TPG</scene></td></tr>
{{STRUCTURE_1xk5|  PDB=1xk5  |  SCENE= }}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1xk5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1xk5 OCA], [https://pdbe.org/1xk5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1xk5 RCSB], [https://www.ebi.ac.uk/pdbsum/1xk5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1xk5 ProSAT]</span></td></tr>
 
</table>
'''Crystal structure of the m3G-cap-binding domain of snurportin1 in complex with a m3GpppG-cap dinucleotide'''
== Function ==
 
[https://www.uniprot.org/uniprot/SPN1_HUMAN SPN1_HUMAN] Functions as an U snRNP-specific nuclear import adapter. Involved in the trimethylguanosine (m3G)-cap-dependent nuclear import of U snRNPs. Binds specifically to the terminal m3G-cap U snRNAs.<ref>PMID:9670026</ref>
 
== Evolutionary Conservation ==
==Overview==
[[Image:Consurf_key_small.gif|200px|right]]
In higher eukaryotes the biogenesis of spliceosomal UsnRNPs involves a nucleocytoplasmic shuttling cycle. After the m7G-cap-dependent export of the snRNAs U1, U2, U4 and U5 to the cytoplasm, each of these snRNAs associates with seven Sm proteins. Subsequently, the m7G-cap is hypermethylated to the 2,2,7-trimethylguanosine (m3G)-cap. The import adaptor snurportin1 recognises the m3G-cap and facilitates the nuclear import of the UsnRNPs by binding to importin-beta. Here we report the crystal structure of the m3G-cap-binding domain of snurportin1 with bound m3GpppG at 2.4 A resolution, revealing a structural similarity to the mRNA-guanyly-transferase. Snurportin1 binds both the hypermethylated cap and the first nucleotide of the RNA in a stacked conformation. This binding mode differs significantly from that of the m7G-cap-binding proteins Cap-binding protein 20 (CBP20), eukaryotic initiation factor 4E (eIF4E) and viral protein 39 (VP39). The specificity of the m3G-cap recognition by snurportin1 was evaluated by fluorescence spectroscopy, demonstrating the importance of a highly solvent exposed tryptophan for the discrimination of m7G-capped RNAs. The critical role of this tryptophan and as well of a tryptophan continuing the RNA base stack was confirmed by nuclear import assays and cap-binding activity tests using several snurportin1 mutants.
Check<jmol>
 
  <jmolCheckbox>
==About this Structure==
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/xk/1xk5_consurf.spt"</scriptWhenChecked>
1XK5 is a [[Single protein]] structure of 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=1XK5 OCA].  
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
 
    <text>to colour the structure by Evolutionary Conservation</text>
==Reference==
  </jmolCheckbox>
Structural basis for m3G-cap-mediated nuclear import of spliceosomal UsnRNPs by snurportin1., Strasser A, Dickmanns A, Luhrmann R, Ficner R, EMBO J. 2005 Jul 6;24(13):2235-43. Epub 2005 May 26. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15920472 15920472]
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1xk5 ConSurf].
<div style="clear:both"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Dickmanns, A.]]
[[Category: Dickmanns A]]
[[Category: Ficner, R.]]
[[Category: Ficner R]]
[[Category: Luehrmann, R.]]
[[Category: Luehrmann R]]
[[Category: Strasser, A.]]
[[Category: Strasser A]]
[[Category: Protein-rna-complex]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 15:07:59 2008''

Latest revision as of 13:36, 13 March 2024

Crystal structure of the m3G-cap-binding domain of snurportin1 in complex with a m3GpppG-cap dinucleotide

1xk5, resolution 2.40Å

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