View source for 1eq1

==NMR STRUCTURE OF AN EXCHANGEABLE APOLIPOPROTEIN-MANDUCA SEXTA APOLIPOPHORIN-III==
<StructureSection load='1eq1' size='340' side='right' caption='[[1eq1]], [[NMR_Ensembles_of_Models | 25 NMR models]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1eq1]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Carolina_sphinx Carolina sphinx]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EQ1 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1EQ1 FirstGlance]. <br>
</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1aep|1aep]], [[1lpe|1lpe]]</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=1eq1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1eq1 OCA], [http://pdbe.org/1eq1 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1eq1 RCSB], [http://www.ebi.ac.uk/pdbsum/1eq1 PDBsum]</span></td></tr>
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== Function ==
[[http://www.uniprot.org/uniprot/APL3_MANSE APL3_MANSE]] Assists in the loading of diacylglycerol, generated from triacylglycerol stores in the fat body through the action of adipokinetic hormone, into lipophorin, the hemolymph lipoprotein. It increases the lipid carrying capacity of lipophorin by covering the expanding hydrophobic surface resulting from diacylglycerol uptake. It thus plays a critical role in the transport of lipids during flight in several species of insects. 
== 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/eq/1eq1_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=1eq1 ConSurf].
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== Publication Abstract from PubMed ==
The high-resolution NMR structure of apolipophorin III from the sphinx moth, Manduca sexta, has been determined in the lipid-free state. We show that lipid-free apolipophorin III adopts a unique helix-bundle topology that has several characteristic structural features. These include a marginally stable, up-and-down helix bundle that allows for concerted opening of the bundle about "hinged" loops upon lipid interaction and buried polar/ionizable residues and buried interhelical H-bonds located in the otherwise hydrophobic interior of the bundle that adjust protein stability and facilitate lipid-induced conformational opening. We suggest that these structural features modulate the conformational adaptability of the lipid-free helix bundle upon lipid binding and control return of the open conformation to the original lipid-free helix-bundle state. Taken together, these data provide a structural rationale for the ability of exchangeable apolipoproteins to reversibly interact with circulating lipoprotein particles.

Structural basis for the conformational adaptability of apolipophorin III, a helix-bundle exchangeable apolipoprotein.,Wang J, Sykes BD, Ryan RO Proc Natl Acad Sci U S A. 2002 Feb 5;99(3):1188-93. Epub 2002 Jan 29. PMID:11818551<ref>PMID:11818551</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 1eq1" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Carolina sphinx]]
[[Category: Ryan, R O]]
[[Category: Sykes, B D]]
[[Category: Wang, J]]
[[Category: Helix-short helix-helix recognition motif]]
[[Category: Five helix-bundle]]
[[Category: Lipid binding protein]]