View source for 4lkp


==Crystal Structure of Apo Human Epidermal Fatty Acid Binding Protein (FABP5)==
<StructureSection load='4lkp' size='340' side='right'caption='[[4lkp]], [[Resolution|resolution]] 1.67&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4lkp]] is a 1 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=4LKP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4LKP 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]] 1.67&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=DMS:DIMETHYL+SULFOXIDE'>DMS</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</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=4lkp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4lkp OCA], [https://pdbe.org/4lkp PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4lkp RCSB], [https://www.ebi.ac.uk/pdbsum/4lkp PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4lkp ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/FABP5_HUMAN FABP5_HUMAN] High specificity for fatty acids. Highest affinity for C18 chain length. Decreasing the chain length or introducing double bonds reduces the affinity. May be involved in keratinocyte differentiation.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Fatty acid-binding proteins (FABPs) are a widely expressed group of calycins that play a well established role in solubilizing cellular fatty acids. Recent studies, however, have recast FABPs as active participants in vital lipid-signaling pathways. FABP5, like its family members, displays a promiscuous ligand binding profile, capable of interacting with numerous long chain fatty acids of varying degrees of saturation. Certain "activating" fatty acids induce the protein's cytoplasmic to nuclear translocation, stimulating PPARbeta/delta transactivation; however, the rules that govern this process remain unknown. Using a range of structural and biochemical techniques, we show that both linoleic and arachidonic acid elicit FABP5's translocation by permitting allosteric communication between the ligand-sensing beta2 loop and a tertiary nuclear localization signal within the alpha-helical cap of the protein. Furthermore, we show that more saturated, nonactivating fatty acids inhibit nuclear localization signal formation by destabilizing this activation loop, thus implicating FABP5 specifically in cis-bonded, polyunsaturated fatty acid signaling.

Structural basis for ligand regulation of the fatty acid-binding protein 5, peroxisome proliferator-activated receptor beta/delta (FABP5-PPARbeta/delta) signaling pathway.,Armstrong EH, Goswami D, Griffin PR, Noy N, Ortlund EA J Biol Chem. 2014 May 23;289(21):14941-54. doi: 10.1074/jbc.M113.514646. Epub, 2014 Apr 1. PMID:24692551<ref>PMID:24692551</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4lkp" style="background-color:#fffaf0;"></div>

==See Also==
*[[Fatty acid-binding protein 3D structures|Fatty acid-binding protein 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Armstrong EH]]
[[Category: Ortlund EA]]