View source for 1eal


==NMR STUDY OF ILEAL LIPID BINDING PROTEIN==
<StructureSection load='1eal' size='340' side='right'caption='[[1eal]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1eal]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Sus_scrofa Sus scrofa]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EAL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EAL FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=1eal FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1eal OCA], [https://pdbe.org/1eal PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1eal RCSB], [https://www.ebi.ac.uk/pdbsum/1eal PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1eal ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/FABP6_PIG FABP6_PIG] Ileal protein which stimulates gastric acid and pepsinogen secretion. Seems to be able to bind to bile salts and bilirubins.
== 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/ea/1eal_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=1eal ConSurf].
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== Publication Abstract from PubMed ==
BACKGROUND: The family of lipid binding proteins (LBPs) includes a large number of fatty acid binding proteins (FABPs) but only two proteins (ileal lipid binding protein, ILBP, and liver fatty acid binding protein) that can bind both fatty acids and bile acids. Bile acid transport is medically and pharmacologically important, but is poorly understood. To understand the binding properties of ILBP, we studied its solution structure with and without bound lipids and compared these with known structures of FABPs. RESULTS: The sequence-specific 1H resonance assignments for porcine ILBP have been determined by homonuclear two-dimensional (2D) NMR spectroscopy for the apo-protein as well as for ILBP complexes with fatty acid and bile acid ligands. From NOE spectra and hydrogen exchange data, similar secondary structure elements were identified for all three protein forms. ILBP is composed of ten antiparallel beta strands arranged in two nearly orthogonal beta sheets (a fold seen in other FABPs, and dubbed the "beta-clam shell'), covered on one side by two short, nearly parallel alpha helices. Binding of fatty acids or bile acids to ILBP alters mainly the side-chain proton resonances of amino acids within the protein cavity, indicating that both bile acids and fatty acids can bind in the interior of the protein between the two beta sheets; binding of bile acids stabilizes the protein backbone by a small amount. Fast hydrogen exchange rates for the backbone amide protons of ILBP indicate that the hydrogen-bonding network of the beta sheet in ILBP is weaker than the corresponding network in rat intestinal and bovine heart FABPs. CONCLUSIONS: The tertiary structure of ILBP is similar to that of other LBPs, but appears to be unusually flexible, with a relatively weak hydrogen-bonding network. It is likely that this flexibility is important in allowing bile acids, which are larger and more rigid than fatty acids, to enter the central cavity of the protein.

Flexibility is a likely determinant of binding specificity in the case of ileal lipid binding protein.,Lucke C, Zhang F, Ruterjans H, Hamilton JA, Sacchettini JC Structure. 1996 Jul 15;4(7):785-800. PMID:8805562<ref>PMID:8805562</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Fatty acid-binding protein 3D structures|Fatty acid-binding protein 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Sus scrofa]]
[[Category: Hamilton JA]]
[[Category: Luecke C]]
[[Category: Rueterjans H]]
[[Category: Sacchettini JC]]
[[Category: Zhang F]]