View source for 4omj


==Crystal structure of SPF bound to 2,3-oxidosqualene==
<StructureSection load='4omj' size='340' side='right'caption='[[4omj]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4omj]] is a 2 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=4OMJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4OMJ 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]] 1.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=2TX:(3S)-2,2-DIMETHYL-3-[(3E,7E,11E,15E)-3,7,12,16,20-PENTAMETHYLHENICOSA-3,7,11,15,19-PENTAEN-1-YL]OXIRANE'>2TX</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></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=4omj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4omj OCA], [https://pdbe.org/4omj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4omj RCSB], [https://www.ebi.ac.uk/pdbsum/4omj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4omj ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/S14L2_HUMAN S14L2_HUMAN] Carrier protein. Binds to some hydrophobic molecules and promotes their transfer between the different cellular sites. Binds with high affinity to alpha-tocopherol. Also binds with a weaker affinity to other tocopherols and to tocotrienols. May have a transcriptional activatory activity via its association with alpha-tocopherol. Probably recognizes and binds some squalene structure, suggesting that it may regulate cholesterol biosynthesis by increasing the transfer of squalene to a metabolic active pool in the cell.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
We present the crystal structures of the SEC14-like domain of supernatant protein factor (SPF) in complex with squalene and 2,3-oxidosqualene. The structures were resolved at 1.75A (complex with squalene) and 1.6A resolution (complex with 2,3-oxidosqualene), leading in both cases to clear images of the protein/substrate interactions. Ligand binding is facilitated by removal of the Golgi-dynamics (GOLD) C-terminal domain of SPF, which, as shown in previous structures of the apo-protein, blocked the opening of the binding pocket to the exterior. Both substrates bind into a large hydrophobic cavity, typical of such lipid-transporter family. Our structures report no specific recognition mode for the epoxide group. In fact, for both molecules, ligand affinity is dominated by hydrophobic interactions, and independent investigations by computational models or differential scanning micro-calorimetry reveal similar binding affinities for both ligands. Our findings elucidate the molecular bases of the role of SPF in sterol endo-synthesis, supporting the original hypothesis that SPF is a facilitator of substrate flow within the sterol synthetic pathway. Moreover, our results suggest that the GOLD domain acts as a regulator, as its conformational displacement must occur to favor ligand binding and release during the different synthetic steps.

Structural insights on cholesterol endosynthesis: Binding of squalene and 2,3-oxidosqualene to supernatant protein factor.,Christen M, Marcaida MJ, Lamprakis C, Aeschimann W, Vaithilingam J, Schneider P, Hilbert M, Schneider G, Cascella M, Stocker A J Struct Biol. 2015 Jun;190(3):261-70. doi: 10.1016/j.jsb.2015.05.001. Epub 2015 , May 16. PMID:25987292<ref>PMID:25987292</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4omj" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Cascella M]]
[[Category: Christen M]]
[[Category: Lamprakis C]]
[[Category: Marcaida MJ]]
[[Category: Stocker A]]