3e76: Difference between revisions
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==Crystal structure of Wild-type GroEL with bound Thallium ions== | |||
<StructureSection load='3e76' size='340' side='right'caption='[[3e76]], [[Resolution|resolution]] 3.94Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[3e76]] is a 14 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_UTI89 Escherichia coli UTI89]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3E76 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3E76 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]] 3.94Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AGS:PHOSPHOTHIOPHOSPHORIC+ACID-ADENYLATE+ESTER'>AGS</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=TL:THALLIUM+(I)+ION'>TL</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=3e76 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3e76 OCA], [https://pdbe.org/3e76 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3e76 RCSB], [https://www.ebi.ac.uk/pdbsum/3e76 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3e76 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/CH60_ECOUT CH60_ECOUT] Prevents misfolding and promotes the refolding and proper assembly of unfolded polypeptides generated under stress conditions (By similarity). | |||
== 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/e7/3e76_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=3e76 ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
GroEL is a bacterial chaperone protein that assembles into a homotetradecameric complex exhibiting D(7) symmetry and utilizes the co-chaperone protein GroES and ATP hydrolysis to assist in the proper folding of a variety of cytosolic proteins. GroEL utilizes two metal cofactors, Mg(2+) and K(+), to bind and hydrolyze ATP. A K(+)-binding site has been proposed to be located next to the nucleotide-binding site, but the available structural data do not firmly support this conclusion. Moreover, more than one functionally significant K(+)-binding site may exist within GroEL. Because K(+) has important and complex effects on GroEL activity and is involved in both positive (intra-ring) and negative (inter-ring) cooperativity for ATP hydrolysis, it is important to determine the exact location of these cation-binding site(s) within GroEL. In this study, the K(+) mimetic Tl(+) was incorporated into GroEL crystals, a moderately redundant 3.94 A resolution X-ray diffraction data set was collected from a single crystal and the strong anomalous scattering signal from the thallium ion was used to identify monovalent cation-binding sites. The results confirmed the previously proposed placement of K(+) next to the nucleotide-binding site and also identified additional binding sites that may be important for GroEL function and cooperativity. These findings also demonstrate the general usefulness of Tl(+) for the identification of monovalent cation-binding sites in protein crystal structures, even when the quality and resolution of the diffraction data are relatively low. | |||
Use of thallium to identify monovalent cation binding sites in GroEL.,Kiser PD, Lorimer GH, Palczewski K Acta Crystallogr Sect F Struct Biol Cryst Commun. 2009 Oct 1;65(Pt, 10):967-71. Epub 2009 Sep 18. PMID:19851000<ref>PMID:19851000</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 3e76" style="background-color:#fffaf0;"></div> | |||
==See Also== | ==See Also== | ||
*[[Heat Shock Protein structures|Heat Shock Protein structures]] | |||
*[[Heat Shock | == References == | ||
<references/> | |||
== | __TOC__ | ||
< | </StructureSection> | ||
[[Category: | [[Category: Escherichia coli UTI89]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Kiser | [[Category: Kiser PD]] | ||
[[Category: Lorimer | [[Category: Lorimer GH]] | ||
[[Category: Palczewski | [[Category: Palczewski K]] | ||
Latest revision as of 15:59, 30 August 2023
Crystal structure of Wild-type GroEL with bound Thallium ionsCrystal structure of Wild-type GroEL with bound Thallium ions
Structural highlights
FunctionCH60_ECOUT Prevents misfolding and promotes the refolding and proper assembly of unfolded polypeptides generated under stress conditions (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedGroEL is a bacterial chaperone protein that assembles into a homotetradecameric complex exhibiting D(7) symmetry and utilizes the co-chaperone protein GroES and ATP hydrolysis to assist in the proper folding of a variety of cytosolic proteins. GroEL utilizes two metal cofactors, Mg(2+) and K(+), to bind and hydrolyze ATP. A K(+)-binding site has been proposed to be located next to the nucleotide-binding site, but the available structural data do not firmly support this conclusion. Moreover, more than one functionally significant K(+)-binding site may exist within GroEL. Because K(+) has important and complex effects on GroEL activity and is involved in both positive (intra-ring) and negative (inter-ring) cooperativity for ATP hydrolysis, it is important to determine the exact location of these cation-binding site(s) within GroEL. In this study, the K(+) mimetic Tl(+) was incorporated into GroEL crystals, a moderately redundant 3.94 A resolution X-ray diffraction data set was collected from a single crystal and the strong anomalous scattering signal from the thallium ion was used to identify monovalent cation-binding sites. The results confirmed the previously proposed placement of K(+) next to the nucleotide-binding site and also identified additional binding sites that may be important for GroEL function and cooperativity. These findings also demonstrate the general usefulness of Tl(+) for the identification of monovalent cation-binding sites in protein crystal structures, even when the quality and resolution of the diffraction data are relatively low. Use of thallium to identify monovalent cation binding sites in GroEL.,Kiser PD, Lorimer GH, Palczewski K Acta Crystallogr Sect F Struct Biol Cryst Commun. 2009 Oct 1;65(Pt, 10):967-71. Epub 2009 Sep 18. PMID:19851000[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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