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==Structure of human urine RBP4 saturated with laurate==
<StructureSection load='5nua' size='340' side='right'caption='[[5nua]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5nua]] 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=5NUA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5NUA 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]] 1.6&#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=DAO:LAURIC+ACID'>DAO</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=5nua FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5nua OCA], [https://pdbe.org/5nua PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5nua RCSB], [https://www.ebi.ac.uk/pdbsum/5nua PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5nua ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/RET4_HUMAN RET4_HUMAN] Defects in RBP4 are a cause of retinol-binding protein deficiency (RBP deficiency) [MIM:[https://omim.org/entry/180250 180250]. This condition causes night vision problems. It produces a typical 'fundus xerophthalmicus', featuring a progressed atrophy of the retinal pigment epithelium.
== Function ==
[https://www.uniprot.org/uniprot/RET4_HUMAN RET4_HUMAN] Delivers retinol from the liver stores to the peripheral tissues. In plasma, the RBP-retinol complex interacts with transthyretin, this prevents its loss by filtration through the kidney glomeruli.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
RBP4 (plasma retinol-binding protein) is the 21kDa transporter of all-trans retinol that circulates in plasma as a moderately tight 1:1 molar complex of the vitamin with the protein. RBP4 is primarily synthesized in the liver but is also produced by adipose tissue and circulates bound to a larger protein, transthyretin, TTR, that serves to increase its molecular mass and thus avoid its elimination by glomerular filtration. This paper reports the high resolution three-dimensional structures of human RBP4 naturally lacking bound retinol purified from plasma, urine and amniotic fluid. In all these crystals we found a fatty acid molecule bound in the hydrophobic ligand-binding site, a result confirmed by mass spectrometry measurements. In addition we also report the 1.5A resolution structures of human holo-RBP4 and of the protein saturated with palmitic and lauric acid and discuss the interaction of the fatty acids and retinol with the protein.

Human plasma retinol-binding protein (RBP4) is also a fatty acid-binding protein.,Perduca M, Nicolis S, Mannucci B, Galliano M, Monaco HL Biochim Biophys Acta. 2018 Apr;1863(4):458-466. doi:, 10.1016/j.bbalip.2018.01.010. PMID:29414511<ref>PMID:29414511</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5nua" style="background-color:#fffaf0;"></div>

==See Also==
*[[Retinol-binding protein 3D structures|Retinol-binding protein 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Galliano M]]
[[Category: Monaco HL]]
[[Category: Perduca M]]