2c1q: Difference between revisions
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==X-ray structure of biotin binding protein from chicken== | |||
<StructureSection load='2c1q' size='340' side='right'caption='[[2c1q]], [[Resolution|resolution]] 2.10Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[2c1q]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2C1Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2C1Q 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]] 2.1Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BTN:BIOTIN'>BTN</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</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=2c1q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2c1q OCA], [https://pdbe.org/2c1q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2c1q RCSB], [https://www.ebi.ac.uk/pdbsum/2c1q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2c1q ProSAT]</span></td></tr> | |||
</table> | |||
== 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/c1/2c1q_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=2c1q ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
BACKGROUND: The chicken genome contains a BBP-A gene showing similar characteristics to avidin family genes. In a previous study we reported that the BBP-A gene may encode a biotin-binding protein due to the high sequence similarity with chicken avidin, especially at regions encoding residues known to be located at the ligand-binding site of avidin. RESULTS: Here, we expand the repertoire of known macromolecular biotin binders by reporting a novel biotin-binding protein A (BBP-A) from chicken. The BBP-A recombinant protein was expressed using two different expression systems and purified with affinity chromatography, biochemically characterized and two X-ray structures were solved - in complex with D-biotin (BTN) and in complex with D-biotin D-sulfoxide (BSO). The BBP-A protein binds free biotin with high, "streptavidin-like" affinity (Kd ~ 10-13 M), which is about 50 times lower than that of chicken avidin. Surprisingly, the affinity of BBP-A for BSO is even higher than the affinity for BTN. Furthermore, the solved structures of the BBP-A--BTN and BBP-A--BSO complexes, which share the fold with the members of the avidin and lipocalin protein families, are extremely similar to each other. CONCLUSION: BBP-A is an avidin-like protein having a beta-barrel fold and high affinity towards BTN. However, BBP-A differs from the other known members of the avidin protein family in thermal stability and immunological properties. BBP-A also has a unique ligand-binding property, the ability to bind BTN and BSO at comparable affinities. BBP-A may have use as a novel material in, e.g. modern bio(nano)technological applications. | |||
Structure and characterization of a novel chicken biotin-binding protein A (BBP-A).,Hytonen VP, Maatta JA, Niskanen EA, Huuskonen J, Helttunen KJ, Halling KK, Nordlund HR, Rissanen K, Johnson MS, Salminen TA, Kulomaa MS, Laitinen OH, Airenne TT BMC Struct Biol. 2007 Mar 7;7:8. PMID:17343730<ref>PMID:17343730</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 2c1q" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Gallus gallus]] | [[Category: Gallus gallus]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Airenne | [[Category: Airenne TT]] | ||
[[Category: Halling | [[Category: Halling KK]] | ||
[[Category: Helttunen | [[Category: Helttunen KJ]] | ||
[[Category: Huuskonen | [[Category: Huuskonen J]] | ||
[[Category: Hytonen | [[Category: Hytonen VP]] | ||
[[Category: Johnson | [[Category: Johnson MS]] | ||
[[Category: Kulomaa | [[Category: Kulomaa MS]] | ||
[[Category: Laitinen | [[Category: Laitinen OH]] | ||
[[Category: Maatta | [[Category: Maatta JAE]] | ||
[[Category: Niskanen | [[Category: Niskanen EA]] | ||
[[Category: Nordlund | [[Category: Nordlund HR]] | ||
[[Category: Rissanen | [[Category: Rissanen K]] | ||
[[Category: Salminen | [[Category: Salminen TA]] | ||
[[Category: Slotte | [[Category: Slotte JP]] | ||