2ize - Revision history

OCA at 09:04, 21 February 2024

2024-02-21T09:04:28Z

← Older revision		Revision as of 09:04, 21 February 2024
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	<StructureSection load='2ize' size='340' side='right'caption='[[2ize]], [[Resolution\|resolution]] 1.57Å' scene=''>		<StructureSection load='2ize' size='340' side='right'caption='[[2ize]], [[Resolution\|resolution]] 1.57Å' scene=''>
	== Structural highlights ==		== Structural highlights ==
	<table><tr><td colspan='2'>[[2ize]] is a 2 chain structure with sequence from [~~http~~://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA]. For a <b>guided tour on the structure components</b> use [~~http~~://proteopedia.org/fgij/fg.htm?mol=2IZE FirstGlance]. <br>		<table><tr><td colspan='2'>[[2ize]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2IZE FirstGlance]. <br>
	</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=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</scene></td></tr>		</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models\|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution\|Resolution]] 1.57Å</td></tr>
	<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[~~http~~://proteopedia.org/fgij/fg.htm?mol=2ize FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ize OCA], [~~http~~://pdbe.org/2ize PDBe], [~~http~~://www.rcsb.org/pdb/explore.do?structureId=2ize RCSB], [~~http~~://www.ebi.ac.uk/pdbsum/2ize PDBsum], [~~http~~://prosat.h-its.org/prosat/prosatexe?pdbcode=2ize ProSAT]</span></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=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</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=2ize FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ize OCA], [https://pdbe.org/2ize PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2ize RCSB], [https://www.ebi.ac.uk/pdbsum/2ize PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2ize ProSAT]</span></td></tr>
	</table>		</table>
	== Function ==		== Function ==
	[~~[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).		[https://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).
	== Evolutionary Conservation ==		== Evolutionary Conservation ==
	[[Image:Consurf_key_small.gif\|200px\|right]]		[[Image:Consurf_key_small.gif\|200px\|right]]
Line 19:		Line 20:
	</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=2ize ConSurf].		</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=2ize ConSurf].
	<div style="clear:both"></div>		<div style="clear:both"></div>
	~~<div style="background-color:#fffaf0;">~~
	~~== Publication Abstract from PubMed ==~~
	The remarkable stability of the streptavidin tetramer towards subunit dissociation becomes even greater upon binding of biotin. At two equivalent extensive monomer-monomer interfaces, monomers tightly associate into dimers that in turn associate into the tetramer at a less extensive dimer-dimer interface. To probe the structural basis for the enhancement of the stability of streptavidin by biotin, the crystal structures of apostreptavidin and its complexes with biotin and other small molecule and cyclic peptide ligands were determined and compared at resolutions as high as 1.36 A over a range of pH values from as low as 1.39. At low pH dramatic changes occur in the conformation and intersubunit hydrogen bonds involving the loop comprising Asp61 to Ser69. The hydrogen-bonded salt bridge between Asp61 Odelta2 and His87 Ndelta1, observed at higher pH, is replaced with a strong hydrogen bond between Asp61 Odelta1 and Asn85 Odelta1. Through crystallography at multiple pH values, the pH where this conformational change occurs, and thus the pKa of Asp61, was determined in crystals of space group I222 and/or I4122 of apostreptavidin and complexes. A range in pKa values for Asp61 was observed in these structures, the lowest being 1.78+/-0.19 for I222 streptavidin-biotin in 2.9 M (NH4)2SO4. At low pH the decrease in pKa of Asp61 and preservation of the intersubunit Asp61 Odelta2-Ndelta1 His87 hydrogen-bonded salt bridge in streptavidin-biotin versus apostreptavidin or streptavidin-peptide complexes is associated with an ordering of the flexible flap comprising residues Ala46 to Glu51, that in turn orders the Arg84 side-chain of a neighboring loop through resulting hydrogen bonds. Ordering of Arg84 in close proximity to the strong intersubunit interface appears to stabilize the conformation associated with the Asp61 Odelta2-Ndelta1 His87 hydrogen-bonded salt bridge. Thus, in addition to the established role of biotin in tetramer stabilization by direct mediation of intersubunit interactions at the weak interface through contact with Trp120, biotin may enhance tetramer stability at the strong interface more indirectly by ordering loop residues.

	~~Binding of biotin to streptavidin stabilizes intersubunit salt bridges between Asp61 and His87 at low pH.,Katz BA J Mol Biol. 1997 Dec 19;274(5):776-800. PMID:9405158<ref>PMID:9405158</ref>~~

	~~From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>~~
	~~</div>~~
	~~<div class="pdbe-citations 2ize" style="background-color:#fffaf0;"></div>~~

	==See Also==		==See Also==
	*[[Avidin 3D structures\|Avidin 3D structures]]		*[[Avidin 3D structures\|Avidin 3D structures]]
	~~== References ==~~
	~~<references/>~~
	__TOC__		__TOC__
	</StructureSection>		</StructureSection>
	[[Category: Large Structures]]		[[Category: Large Structures]]
	[[Category: Streptomyces avidinii]]		[[Category: Streptomyces avidinii]]
	[[Category: Katz~~, B A]]~~		[[Category: Katz BA]]
	~~[[Category: Apostreptavidin]]~~
	~~[[Category: Biotin-binding protein~~]]

OCA at 10:41, 16 September 2020

2020-09-16T10:41:56Z

← Older revision		Revision as of 10:41, 16 September 2020
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	==APOSTREPTAVIDIN PH 3.08 I222 COMPLEX==		==APOSTREPTAVIDIN PH 3.08 I222 COMPLEX==
	<StructureSection load='2ize' size='340' side='right' caption='[[2ize]], [[Resolution\|resolution]] 1.57Å' scene=''>		<StructureSection load='2ize' size='340' side='right'caption='[[2ize]], [[Resolution\|resolution]] 1.57Å' scene=''>
	== Structural highlights ==		== Structural highlights ==
	<table><tr><td colspan='2'>[[2ize]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA]. For a <b>guided tour on the structure components</b> use [http://~~oca~~.~~weizmann.ac.il/oca-docs~~/fgij/fg.htm?mol=2IZE FirstGlance]. <br>		<table><tr><td colspan='2'>[[2ize]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=2IZE FirstGlance]. <br>
	</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand\|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</scene></td></tr>		</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=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</scene></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=2ize FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ize OCA], [http://pdbe.org/2ize PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ize RCSB], [http://www.ebi.ac.uk/pdbsum/2ize PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2ize ProSAT]</span></td></tr>		<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=2ize FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ize OCA], [http://pdbe.org/2ize PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ize RCSB], [http://www.ebi.ac.uk/pdbsum/2ize PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2ize ProSAT]</span></td></tr>
	</table>		</table>
	== Function ==		== Function ==
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	==See Also==		==See Also==
	*[[Avidin\|Avidin]]		*[[Avidin 3D structures\|Avidin 3D structures]]
	== References ==		== References ==
	<references/>		<references/>
	__TOC__		__TOC__
	</StructureSection>		</StructureSection>
			[[Category: Large Structures]]
	[[Category: Streptomyces avidinii]]		[[Category: Streptomyces avidinii]]
	[[Category: Katz, B A]]		[[Category: Katz, B A]]
	[[Category: Apostreptavidin]]		[[Category: Apostreptavidin]]
	[[Category: Biotin-binding protein]]		[[Category: Biotin-binding protein]]

OCA at 07:37, 12 December 2018

2018-12-12T07:37:07Z

← Older revision		Revision as of 07:37, 12 December 2018
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	Check<jmol>		Check<jmol>
	<jmolCheckbox>		<jmolCheckbox>
	<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/iz/2ize_consurf.spt"</scriptWhenChecked>		<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/iz/2ize_consurf.spt"</scriptWhenChecked>
	<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>		<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
	<text>to colour the structure by Evolutionary Conservation</text>		<text>to colour the structure by Evolutionary Conservation</text>

OCA at 06:43, 9 March 2017

2017-03-09T06:43:08Z

← Older revision		Revision as of 06:43, 9 March 2017
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	==APOSTREPTAVIDIN PH 3.08 I222 COMPLEX==		==APOSTREPTAVIDIN PH 3.08 I222 COMPLEX==
	<StructureSection load='2ize' size='340' side='right' caption='[[2ize]], [[Resolution\|resolution]] 1.57Å' scene=''>		<StructureSection load='2ize' size='340' side='right' caption='[[2ize]], [[Resolution\|resolution]] 1.57Å' scene=''>
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	<table><tr><td colspan='2'>[[2ize]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2IZE FirstGlance]. <br>		<table><tr><td colspan='2'>[[2ize]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2IZE FirstGlance]. <br>
	</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand\|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</scene></td></tr>		</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand\|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</scene></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=2ize FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ize OCA], [http://pdbe.org/2ize PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ize RCSB], [http://www.ebi.ac.uk/pdbsum/2ize PDBsum]</span></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=2ize FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ize OCA], [http://pdbe.org/2ize PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ize RCSB], [http://www.ebi.ac.uk/pdbsum/2ize PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2ize ProSAT]</span></td></tr>
	</table>		</table>
	== Function ==		== Function ==

OCA at 03:41, 8 February 2016

2016-02-08T03:41:40Z

← Older revision		Revision as of 03:41, 8 February 2016
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	<text>to colour the structure by Evolutionary Conservation</text>		<text>to colour the structure by Evolutionary Conservation</text>
	</jmolCheckbox>		</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/~~chain_selection~~.php?pdb_ID=~~2ata~~ ConSurf].		</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=2ize ConSurf].
	<div style="clear:both"></div>		<div style="clear:both"></div>
	<div style="background-color:#fffaf0;">		<div style="background-color:#fffaf0;">

OCA at 07:31, 10 September 2015

2015-09-10T07:31:50Z

← Older revision		Revision as of 07:31, 10 September 2015
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	<table><tr><td colspan='2'>[[2ize]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2IZE FirstGlance]. <br>		<table><tr><td colspan='2'>[[2ize]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2IZE FirstGlance]. <br>
	</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand\|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</scene></td></tr>		</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand\|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</scene></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=2ize FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ize OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2ize RCSB], [http://www.ebi.ac.uk/pdbsum/2ize PDBsum]</span></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=2ize FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ize OCA], [http://pdbe.org/2ize PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ize RCSB], [http://www.ebi.ac.uk/pdbsum/2ize PDBsum]</span></td></tr>
	</table>		</table>
	== Function ==		== Function ==
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	From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>		From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
	</div>		</div>
			<div class="pdbe-citations 2ize" style="background-color:#fffaf0;"></div>

	==See Also==		==See Also==

OCA at 20:19, 24 December 2014

2014-12-24T20:19:39Z

← Older revision		Revision as of 20:19, 24 December 2014
Line 3:		Line 3:
	== Structural highlights ==		== Structural highlights ==
	<table><tr><td colspan='2'>[[2ize]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2IZE FirstGlance]. <br>		<table><tr><td colspan='2'>[[2ize]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2IZE FirstGlance]. <br>
	</td></tr><tr><td class="sblockLbl"><b>[[Ligand\|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</scene><br>		</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand\|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</scene></td></tr>
	<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2ize FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ize OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2ize RCSB], [http://www.ebi.ac.uk/pdbsum/2ize PDBsum]</span></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=2ize FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ize OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2ize RCSB], [http://www.ebi.ac.uk/pdbsum/2ize PDBsum]</span></td></tr>
	<table>		</table>
			== Function ==
			[[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).
	== Evolutionary Conservation ==		== Evolutionary Conservation ==
	[[Image:Consurf_key_small.gif\|200px\|right]]		[[Image:Consurf_key_small.gif\|200px\|right]]
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	</StructureSection>		</StructureSection>
	[[Category: Streptomyces avidinii]]		[[Category: Streptomyces avidinii]]
	[[Category: Katz, B A.]]		[[Category: Katz, B A]]
	[[Category: Apostreptavidin]]		[[Category: Apostreptavidin]]
	[[Category: Biotin-binding protein]]		[[Category: Biotin-binding protein]]

OCA at 04:58, 29 September 2014

2014-09-29T04:58:44Z

← Older revision		Revision as of 04:58, 29 September 2014
Line 1:		Line 1:
	[[Image:~~2ize~~.~~png~~\|~~left~~\|~~200px~~]]		==APOSTREPTAVIDIN PH 3.08 I222 COMPLEX==
			<StructureSection load='2ize' size='340' side='right' caption='[[2ize]], [[Resolution\|resolution]] 1.57Å' scene=''>
			== Structural highlights ==
			<table><tr><td colspan='2'>[[2ize]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2IZE FirstGlance]. <br>
			</td></tr><tr><td class="sblockLbl"><b>[[Ligand\|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</scene><br>
			<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2ize FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ize OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2ize RCSB], [http://www.ebi.ac.uk/pdbsum/2ize PDBsum]</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/iz/2ize_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/chain_selection.php?pdb_ID=2ata ConSurf].
			<div style="clear:both"></div>
			<div style="background-color:#fffaf0;">
			== Publication Abstract from PubMed ==
			The remarkable stability of the streptavidin tetramer towards subunit dissociation becomes even greater upon binding of biotin. At two equivalent extensive monomer-monomer interfaces, monomers tightly associate into dimers that in turn associate into the tetramer at a less extensive dimer-dimer interface. To probe the structural basis for the enhancement of the stability of streptavidin by biotin, the crystal structures of apostreptavidin and its complexes with biotin and other small molecule and cyclic peptide ligands were determined and compared at resolutions as high as 1.36 A over a range of pH values from as low as 1.39. At low pH dramatic changes occur in the conformation and intersubunit hydrogen bonds involving the loop comprising Asp61 to Ser69. The hydrogen-bonded salt bridge between Asp61 Odelta2 and His87 Ndelta1, observed at higher pH, is replaced with a strong hydrogen bond between Asp61 Odelta1 and Asn85 Odelta1. Through crystallography at multiple pH values, the pH where this conformational change occurs, and thus the pKa of Asp61, was determined in crystals of space group I222 and/or I4122 of apostreptavidin and complexes. A range in pKa values for Asp61 was observed in these structures, the lowest being 1.78+/-0.19 for I222 streptavidin-biotin in 2.9 M (NH4)2SO4. At low pH the decrease in pKa of Asp61 and preservation of the intersubunit Asp61 Odelta2-Ndelta1 His87 hydrogen-bonded salt bridge in streptavidin-biotin versus apostreptavidin or streptavidin-peptide complexes is associated with an ordering of the flexible flap comprising residues Ala46 to Glu51, that in turn orders the Arg84 side-chain of a neighboring loop through resulting hydrogen bonds. Ordering of Arg84 in close proximity to the strong intersubunit interface appears to stabilize the conformation associated with the Asp61 Odelta2-Ndelta1 His87 hydrogen-bonded salt bridge. Thus, in addition to the established role of biotin in tetramer stabilization by direct mediation of intersubunit interactions at the weak interface through contact with Trp120, biotin may enhance tetramer stability at the strong interface more indirectly by ordering loop residues.

	~~{{STRUCTURE_2ize\| PDB=2ize \| SCENE= }}~~		Binding of biotin to streptavidin stabilizes intersubunit salt bridges between Asp61 and His87 at low pH.,Katz BA J Mol Biol. 1997 Dec 19;274(5):776-800. PMID:9405158<ref>PMID:9405158</ref>

	~~===APOSTREPTAVIDIN PH 3.08 I222 COMPLEX===~~		From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
			</div>
	~~{{ABSTRACT_PUBMED_9405158}}~~

	~~==About this Structure==~~
	~~[[2ize]] is~~ a ~~2 chain structure with sequence from [http://en~~.~~wikipedia~~.~~org/wiki/Streptomyces_avidinii Streptomyces avidinii]~~. ~~Full crystallographic information is available from [http:~~/~~/oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA].~~

	==See Also==		==See Also==
	*[[Avidin\|Avidin]]		*[[Avidin\|Avidin]]
			== References ==
	==~~Reference~~==		<references/>
	<~~ref group="xtra">PMID:009405158<~~/~~ref~~><~~references group="xtra"~~/>		__TOC__
			</StructureSection>
	[[Category: Streptomyces avidinii]]		[[Category: Streptomyces avidinii]]
	[[Category: Katz, B A.]]		[[Category: Katz, B A.]]
	[[Category: Apostreptavidin]]		[[Category: Apostreptavidin]]
	[[Category: Biotin-binding protein]]		[[Category: Biotin-binding protein]]

OCA at 08:47, 20 October 2012

2012-10-20T08:47:07Z

← Older revision		Revision as of 08:47, 20 October 2012
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	==About this Structure==		==About this Structure==
	[[2ize]] is a 2 chain structure ~~of [[Avidin]]~~ with sequence from [http://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA].		[[2ize]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IZE OCA].

	==See Also==		==See Also==

OCA at 20:44, 25 July 2012

2012-07-25T20:44:28Z

← Older revision		Revision as of 20:44, 25 July 2012
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	[[Image:2ize.png\|left\|200px]]		[[Image:2ize.png\|left\|200px]]

	~~<!--~~
	~~The line below this paragraph, containing "STRUCTURE_2ize", creates the "Structure Box" on the page.~~
	~~You may change the PDB parameter (which sets the PDB file loaded into the applet)~~
	~~or the SCENE parameter (which sets the initial scene displayed when the page is loaded),~~
	~~or leave the SCENE parameter empty for the default display.~~
	~~-->~~
	{{STRUCTURE_2ize\| PDB=2ize \| SCENE= }}		{{STRUCTURE_2ize\| PDB=2ize \| SCENE= }}

	===APOSTREPTAVIDIN PH 3.08 I222 COMPLEX===		===APOSTREPTAVIDIN PH 3.08 I222 COMPLEX===


	~~<!--~~
	~~The line below this paragraph, {{ABSTRACT_PUBMED_9405158}}, adds the Publication Abstract to the page~~
	~~(as it appears on PubMed at http://www.pubmed.gov), where 9405158 is the PubMed ID number.~~
	~~-->~~
	{{ABSTRACT_PUBMED_9405158}}		{{ABSTRACT_PUBMED_9405158}}

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	==See Also==		==See Also==
	*[[Avidin]]		*[[Avidin\|Avidin]]

	==Reference==		==Reference==