1kqw: Difference between revisions
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==Crystal structure of holo-CRBP from zebrafish== | |||
<StructureSection load='1kqw' size='340' side='right'caption='[[1kqw]], [[Resolution|resolution]] 1.38Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1kqw]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Danio_rerio Danio rerio]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KQW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1KQW 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]] 1.38Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=RTL:RETINOL'>RTL</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=1kqw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kqw OCA], [https://pdbe.org/1kqw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1kqw RCSB], [https://www.ebi.ac.uk/pdbsum/1kqw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1kqw ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/Q8UVG6_DANRE Q8UVG6_DANRE] | |||
== 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/kq/1kqw_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=1kqw ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Cellular retinol-binding proteins (CRBPs) are cytoplasmic retinol-specific binding proteins. Mammalian CRBPs have been thoroughly characterised previously. Here we report on the identification and X-ray structural analysis of the apo (1.7A resolution) and holo (1.4A resolution) forms of a zebrafish CRBP. According to amino acid sequence and structure analyses, the zebrafish CRBP that we have identified resembles closely mammalian CRBP II, suggesting that it is the zebrafish orthologue of this mammalian CRBP type. Zebrafish CRBP forms a tight complex with all-trans retinol, producing an absorption spectrum similar to those of mammalian holo-CRBPs, albeit slightly blue-shifted. The superposition of the alpha-carbon atoms of the liganded (complexed with retinol) and unliganded forms of zebrafish CRBP shows significant differences in correspondence of the betaC-betaD (residues 55-58) and betaE-betaF (residues 74-77) turns, providing evidence for the occurrence of conformational changes accompanying retinol binding/release. Remarkable and well-defined ligand-dependent conformational changes in the protein region comprising the two beta-turns affect both the main chain and the side-chains of several residues. The two beta-turns project towards the interior of the cavity devoid of ligand of the apoprotein. The side-chains of F57, Y60 and L77 change substantially their orientation and position in the apoprotein relative to the holoprotein. In the beta-barrel internal cavity of apo-CRBP they occupy some of the space that is otherwise occupied by bound retinol in holo-CRBP, and are displaced from these positions on ligand binding. These results indicate that a flexible area encompassing the betaC-betaD and betaE-betaF turns may serve as the ligand portal and that these turns undergo conformational changes associated with the not yet clarified mechanism of retinol binding and release in CRBPs. | |||
Identification and structural analysis of a zebrafish apo and holo cellular retinol-binding protein.,Calderone V, Folli C, Marchesani A, Berni R, Zanotti G J Mol Biol. 2002 Aug 16;321(3):527-35. PMID:12162964<ref>PMID:12162964</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1kqw" style="background-color:#fffaf0;"></div> | |||
== | ==See Also== | ||
*[[Retinol-binding protein 3D structures|Retinol-binding protein 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
== | |||
[[Category: Danio rerio]] | [[Category: Danio rerio]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Berni | [[Category: Berni R]] | ||
[[Category: Calderone | [[Category: Calderone V]] | ||
[[Category: Folli | [[Category: Folli C]] | ||
[[Category: Marchesani | [[Category: Marchesani A]] | ||
[[Category: Zanotti | [[Category: Zanotti G]] | ||