View source for 1ave


==CRYSTAL STRUCTURE OF HEN EGG-WHITE APO-AVIDIN IN RELATION TO ITS THERMAL STABILITY PROPERTIES==
<StructureSection load='1ave' size='340' side='right'caption='[[1ave]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1ave]] is a 2 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=1AVE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1AVE 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]] 2.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</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=1ave FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ave OCA], [https://pdbe.org/1ave PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ave RCSB], [https://www.ebi.ac.uk/pdbsum/1ave PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ave ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/AVID_CHICK AVID_CHICK] The biological function of avidin is not known. Forms a strong non-covalent specific complex with biotin (one molecule of biotin per subunit of avidin).
== 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/av/1ave_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=1ave ConSurf].
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== Publication Abstract from PubMed ==
The three-dimensional structure of hen egg-white apo-avidin, crystallized in a tetragonal crystal form, has been refined to a crystallographic R-factor of 0.164 (for the 6390 observed reflections in the 10.0 to 2.8 A resolution range). As in the case of holo-avidin, from which starting atomic co-ordinates were derived, the functional tetramer shows 2-pseudo 22 molecular symmetry. Each promoter is organized in an eight-stranded antiparallel orthogonal beta-barrel, with extended loop regions, which define the biotin binding pocket in the protomer core. In the absence of biotin the binding site is only partly occupied by water molecules. The structure of the binding site residues, as observed in apo-avidin, is highly complementary to that of the incoming biotin molecule, accounting for prompt and specific recognition. A crystal lattice contact may play a role in stabilizing the conformation of one protein loop, part of the biotin-binding pocket.

Crystal structure of apo-avidin from hen egg-white.,Pugliese L, Malcovati M, Coda A, Bolognesi M J Mol Biol. 1994 Jan 7;235(1):42-6. PMID:8289264<ref>PMID:8289264</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1ave" style="background-color:#fffaf0;"></div>

==See Also==
*[[Avidin 3D structures|Avidin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Gallus gallus]]
[[Category: Large Structures]]
[[Category: Bolognesi M]]
[[Category: Coda A]]
[[Category: Malcovati M]]
[[Category: Pugliese L]]