View source for 1ln2

==Crystal Structure of Human Phosphatidylcholine Transfer Protein in Complex with Dilinoleoylphosphatidylcholine (Seleno-Met Protein)==
<StructureSection load='1ln2' size='340' side='right' caption='[[1ln2]], [[Resolution|resolution]] 2.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1ln2]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LN2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1LN2 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=DLP:1,2-DILINOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE'>DLP</scene></td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1ln1|1ln1]], [[1ln3|1ln3]]</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ln2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ln2 OCA], [http://pdbe.org/1ln2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1ln2 RCSB], [http://www.ebi.ac.uk/pdbsum/1ln2 PDBsum]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/PPCT_HUMAN PPCT_HUMAN]] Catalyzes the transfer of phosphatidylcholine between membranes. Binds a single lipid molecule.<ref>PMID:12055623</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/ln/1ln2_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=1ln2 ConSurf].
<div style="clear:both"></div>
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== Publication Abstract from PubMed ==
Phosphatidylcholines (PtdChos) comprise the most common phospholipid class in eukaryotic cells. In mammalian cells, these insoluble molecules are transferred between membranes by a highly specific phosphatidylcholine transfer protein (PC-TP) belonging to the steroidogenic acute regulatory protein related transfer (START) domain superfamily of hydrophobic ligand-binding proteins. The crystal structures of human PC-TP in complex with dilinoleoyl-PtdCho or palmitoyl-linoleoyl-PtdCho reveal that a single well-ordered PtdCho molecule occupies a centrally located tunnel. The positively charged choline headgroup of the lipid engages in cation-pi interactions within a cage formed by the faces of three aromatic residues. These binding determinants and those for the phosphoryl group may be exposed to the lipid headgroup at the membrane-water interface by a conformational change involving the amphipathic C-terminal helix and an Omega-loop. The structures presented here provide a basis for rationalizing the specificity of PC-TP for PtdCho and may identify common features used by START proteins to bind their hydrophobic ligands.

Structure of human phosphatidylcholine transfer protein in complex with its ligand.,Roderick SL, Chan WW, Agate DS, Olsen LR, Vetting MW, Rajashankar KR, Cohen DE Nat Struct Biol. 2002 Jul;9(7):507-11. PMID:12055623<ref>PMID:12055623</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1ln2" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Human]]
[[Category: Agate, D S]]
[[Category: Chan, W W]]
[[Category: Cohen, D E]]
[[Category: Olsen, L R]]
[[Category: Rajashankar, K R]]
[[Category: Roderick, S L]]
[[Category: Vetting, M W]]
[[Category: Lipid binding protein]]
[[Category: Start domain]]