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==ATP-triggered molecular mechanics of the chaperonin GroEL== | |||
=== | <StructureSection load='4aas' size='340' side='right' caption='[[4aas]], [[Resolution|resolution]] 8.50Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[4aas]] is a 14 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4AAS OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4AAS FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><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='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4aaq|4aaq]], [[4aar|4aar]], [[4aau|4aau]], [[4ab2|4ab2]], [[4ab3|4ab3]]</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=4aas FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4aas OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4aas RCSB], [http://www.ebi.ac.uk/pdbsum/4aas PDBsum]</span></td></tr> | |||
</table> | |||
== Function == | |||
[[http://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®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
==See Also== | ==See Also== | ||
*[[Chaperonin|Chaperonin]] | *[[Chaperonin|Chaperonin]] | ||
== References == | |||
== | <references/> | ||
__TOC__ | |||
</StructureSection> | |||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Clare, D K | [[Category: Clare, D K]] | ||
[[Category: Farr, G W | [[Category: Farr, G W]] | ||
[[Category: Horwich, A L | [[Category: Horwich, A L]] | ||
[[Category: Quispe, J | [[Category: Quispe, J]] | ||
[[Category: Saibil, H R | [[Category: Saibil, H R]] | ||
[[Category: Stagg, S | [[Category: Stagg, S]] | ||
[[Category: Topf, M | [[Category: Topf, M]] | ||
[[Category: Vasishtan, D | [[Category: Vasishtan, D]] | ||
[[Category: Chaperone]] | [[Category: Chaperone]] | ||