5vl5

<StructureSection load='5vl5' size='340' side='right' caption='[[5vl5]], [[Resolution|resolution]] 1.46&Aring;' scene=''>

<table><tr><td colspan='2'>[[5vl5]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5VL5 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5VL5 FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=S31:[N-(3-{bis[2-(pyridin-2-yl-kappaN)ethyl]amino-kappaN}propyl)-5-(2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamide](azido)(hydroxy)copper'>S31</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5vkx|5vkx]], [[5vl8|5vl8]]</td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5vl5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5vl5 OCA], [http://pdbe.org/5vl5 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5vl5 RCSB], [http://www.ebi.ac.uk/pdbsum/5vl5 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5vl5 ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/SAV_STRAV SAV_STRAV]] The biological function of streptavidin is not known. Forms a strong non-covalent specific complex with biotin (one molecule of biotin per subunit of streptavidin).

Secondary coordination spheres of metal complexes are instrumental in controlling properties that are linked to function. To study these effects in aqueous solutions artificial Cu proteins have been developed using biotin-streptavidin (Sav) technology and their binding of external azide ions investigated. Parallel binding studies were done in crystallo on single crystals of the artificial Cu proteins. Spectroscopic changes in solution are consistent with azide binding to the Cu centers. Structural studies corroborate that a Cu-N3 unit is present in each Sav subunit and reveal the composition of hydrogen bonding (H-bonding) networks that include the coordinated azido ligand. The networks involve amino acid residues and water molecules within the secondary coordination sphere. Mutation of these residues to ones that cannot form H-bonds caused a measurble change in the equilibrium binding constants that were measured in solution. These findings further demonstrate the utility of biotin-Sav technology to prepare water-stable inorganic complexes whose structures can be controlled within both primary and secondary coordination spheres.

 

== References ==

[[Category: Borovik, A S]]

[[Category: Heinisch, T]]

[[Category: Mann, S I]]

[[Category: Ward, T R]]

[[Category: Azide]]

[[Category: Biotin]]

[[Category: Streptavidin]]