View source for 2x7k


==The crystal structure of PPIL1 in complex with cyclosporine A suggests a binding mode for SKIP==
<StructureSection load='2x7k' size='340' side='right'caption='[[2x7k]], [[Resolution|resolution]] 1.15&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2x7k]] 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=2X7K OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2X7K FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CD:CADMIUM+ION'>CD</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=ABA:ALPHA-AMINOBUTYRIC+ACID'>ABA</scene>, <scene name='pdbligand=BMT:4-METHYL-4-[(E)-2-BUTENYL]-4,N-METHYL-THREONINE'>BMT</scene>, <scene name='pdbligand=DAL:D-ALANINE'>DAL</scene>, <scene name='pdbligand=MLE:N-METHYLLEUCINE'>MLE</scene>, <scene name='pdbligand=MVA:N-METHYLVALINE'>MVA</scene>, <scene name='pdbligand=SAR:SARCOSINE'>SAR</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1bck|1bck]], [[1c5f|1c5f]], [[1csa|1csa]], [[1cwa|1cwa]], [[1cwb|1cwb]], [[1cwc|1cwc]], [[1cwf|1cwf]], [[1cwh|1cwh]], [[1cwi|1cwi]], [[1cwj|1cwj]], [[1cwk|1cwk]], [[1cwl|1cwl]], [[1cwm|1cwm]], [[1cwo|1cwo]], [[1cya|1cya]], [[1cyb|1cyb]], [[1cyn|1cyn]], [[1ikf|1ikf]], [[1m63|1m63]], [[1mf8|1mf8]], [[1mik|1mik]], [[1qng|1qng]], [[1qnh|1qnh]], [[1xq7|1xq7]], [[2esl|2esl]], [[2oju|2oju]], [[2poy|2poy]], [[2rma|2rma]], [[2rmb|2rmb]], [[2rmc|2rmc]], [[2wfj|2wfj]], [[2x2c|2x2c]], [[2z6w|2z6w]], [[3bo7|3bo7]], [[3cys|3cys]], [[3eov|3eov]], [[1xwn|1xwn]]</div></td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Peptidylprolyl_isomerase Peptidylprolyl isomerase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.2.1.8 5.2.1.8] </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=2x7k FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2x7k OCA], [https://pdbe.org/2x7k PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2x7k RCSB], [https://www.ebi.ac.uk/pdbsum/2x7k PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2x7k ProSAT]</span></td></tr>
</table>
== Function ==
[[https://www.uniprot.org/uniprot/PPIL1_HUMAN PPIL1_HUMAN]] PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. May be involved in pre-mRNA splicing.<ref>PMID:16595688</ref>  
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/x7/2x7k_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</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=2x7k ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
BACKGROUND: The removal of introns from pre-mRNA is carried out by a large macromolecular machine called the spliceosome. The peptidyl-prolyl cis/trans isomerase PPIL1 is a component of the human spliceosome and binds to the spliceosomal SKIP protein via a binding site distinct from its active site. PRINCIPAL FINDINGS: Here, we have studied the PPIL1 protein and its interaction with SKIP biochemically and by X-ray crystallography. A minimal linear binding epitope derived from the SKIP protein could be determined using a peptide array. A 36-residue region of SKIP centred on an eight-residue epitope suffices to bind PPIL1 in pull-down experiments. The crystal structure of PPIL1 in complex with the inhibitor cyclosporine A (CsA) was obtained at a resolution of 1.15 A and exhibited two bound Cd(2+) ions that enabled SAD phasing. PPIL1 residues that have previously been implicated in binding of SKIP are involved in the coordination of Cd(2+) ions in the present crystal structure. Employing the present crystal structure, the determined minimal binding epitope and previously published NMR data, a molecular docking study was performed. In the docked model of the PPIL1.SKIP interaction, a proline residue of SKIP is buried in a hydrophobic pocket of PPIL1. This hydrophobic contact is encircled by several hydrogen bonds between the SKIP peptide and PPIL1. CONCLUSION: We characterized a short, linear epitope of SKIP that is sufficient to bind the PPIL1 protein. Our data indicate that this SKIP peptide could function in recruiting PPIL1 into the core of the spliceosome. We present a molecular model for the binding mode of SKIP to PPIL1 which emphasizes the versatility of cyclophilin-type PPIases to engage in additional interactions with other proteins apart from active site contacts despite their limited surface area.

The crystal structure of PPIL1 bound to cyclosporine A suggests a binding mode for a linear epitope of the SKIP protein.,Stegmann CM, Luhrmann R, Wahl MC PLoS One. 2010 Apr 2;5(4):e10013. PMID:20368803<ref>PMID:20368803</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2x7k" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Human]]
[[Category: Large Structures]]
[[Category: Peptidylprolyl isomerase]]
[[Category: Luehrmann, R]]
[[Category: Stegmann, C M]]
[[Category: Wahl, M C]]
[[Category: Cyclosporin some]]
[[Category: Immunosuppressant]]
[[Category: Isomerase-cyclosporin complex]]
[[Category: Isomerase-immunosuppressant complex]]