View source for 4ab2


==ATP-triggered molecular mechanics of the chaperonin GroEL==
<SX load='4ab2' size='340' side='right' viewer='molstar' caption='[[4ab2]], [[Resolution|resolution]] 8.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4ab2]] is a 14 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4AB2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4AB2 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 8.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</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=4ab2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ab2 OCA], [https://pdbe.org/4ab2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ab2 RCSB], [https://www.ebi.ac.uk/pdbsum/4ab2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ab2 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CH60_ECOLI CH60_ECOLI] Prevents misfolding and promotes the refolding and proper assembly of unfolded polypeptides generated under stress conditions.[HAMAP-Rule:MF_00600]  Essential for the growth of the bacteria and the assembly of several bacteriophages. Also plays a role in coupling between replication of the F plasmid and cell division of the cell.[HAMAP-Rule:MF_00600]
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The chaperonin GroEL assists the folding of nascent or stress-denatured polypeptides by actions of binding and encapsulation. ATP binding initiates a series of conformational changes triggering the association of the cochaperonin GroES, followed by further large movements that eject the substrate polypeptide from hydrophobic binding sites into a GroES-capped, hydrophilic folding chamber. We used cryo-electron microscopy, statistical analysis, and flexible fitting to resolve a set of distinct GroEL-ATP conformations that can be ordered into a trajectory of domain rotation and elevation. The initial conformations are likely to be the ones that capture polypeptide substrate. Then the binding domains extend radially to separate from each other but maintain their binding surfaces facing the cavity, potentially exerting mechanical force upon kinetically trapped, misfolded substrates. The extended conformation also provides a potential docking site for GroES, to trigger the final, 100 degrees domain rotation constituting the "power stroke" that ejects substrate into the folding chamber.

ATP-triggered conformational changes delineate substrate-binding and -folding mechanics of the GroEL chaperonin.,Clare DK, Vasishtan D, Stagg S, Quispe J, Farr GW, Topf M, Horwich AL, Saibil HR Cell. 2012 Mar 30;149(1):113-23. Epub 2012 Mar 22. PMID:22445172<ref>PMID:22445172</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4ab2" style="background-color:#fffaf0;"></div>

==See Also==
*[[Chaperonin 3D structures|Chaperonin 3D structures]]
== References ==
<references/>
__TOC__
</SX>
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Clare DK]]
[[Category: Farr GW]]
[[Category: Horwich AL]]
[[Category: Quispe J]]
[[Category: Saibil HR]]
[[Category: Stagg S]]
[[Category: Topf M]]
[[Category: Vasishtan D]]