1em2

<StructureSection load='1em2' size='340' side='right' caption='[[1em2]], [[Resolution|resolution]] 2.20&Aring;' scene=''>

<table><tr><td colspan='2'>[[1em2]] is a 1 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=1EM2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1EM2 FirstGlance]. <br>

</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=TAR:D(-)-TARTARIC+ACID'>TAR</scene><br>

<tr><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>

<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1em2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1em2 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1em2 RCSB], [http://www.ebi.ac.uk/pdbsum/1em2 PDBsum]</span></td></tr>

<table>

<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/em/1em2_consurf.spt"</scriptWhenChecked>

</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/chain_selection.php?pdb_ID=2ata ConSurf].

<div style="background-color:#fffaf0;">

== Publication Abstract from PubMed ==

The steroidogenic acute regulatory protein (StAR) regulates acute steroidogenesis in the adrenal cortex and gonads by promoting the translocation of cholesterol to the mitochondrial inner membrane where the first step in steriod biosynthesis is catalyzed. StAR-related lipid transfer (START) domains occur in proteins involved in lipid transport and metabolism, signal transduction, and transcriptional regulation. The 2.2 A resolution crystal structure of the START domain of human MLN64 reported here reveals an alpha/beta fold built around a U-shaped incomplete beta-barrel. The interior of the protein encompasses a 26 x 12 x 11 A hydrophobic tunnel that is large enough to bind a single cholesterol molecule. The StAR and MLN64 START domains bind 1 mole of 14C cholesterol per mole of protein in vitro. Based on the START domain structure and cholesterol binding stoichiometry, it is proposed that StAR acts by shuttling cholesterol molecules one at a time through the intermembrane space of the mitochondrion.

Structure and lipid transport mechanism of a StAR-related domain.,Tsujishita Y, Hurley JH Nat Struct Biol. 2000 May;7(5):408-14. PMID:10802740<ref>PMID:10802740</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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==See Also==

*[[PYR/PYL/RCAR family of ABA receptors|PYR/PYL/RCAR family of ABA receptors]]

== References ==

<references/>

[[Category: Hurley, J H.]]

[[Category: Tsujishita, Y.]]

[[Category: Beta barrel]]

[[Category: Lipid binding protein]]