View source for 2yey


==Crystal structure of the allosteric-defective chaperonin GroEL E434K mutant==
<StructureSection load='2yey' size='340' side='right'caption='[[2yey]], [[Resolution|resolution]] 4.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2yey]] is a 14 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=3fbh 3fbh]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2YEY OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2YEY 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]] 4.5&#8491;</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=2yey FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2yey OCA], [https://pdbe.org/2yey PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2yey RCSB], [https://www.ebi.ac.uk/pdbsum/2yey PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2yey 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]
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== Publication Abstract from PubMed ==
The chaperonin GroEL adopts a double-ring structure with various modes of allosteric communication. The simultaneous positive intra-ring and negative inter-ring co-operativities alternate the functionality of the folding cavities in both protein rings. Negative inter-ring co-operativity is maintained through different inter-ring interactions, including a salt bridge involving Glu 461. Replacement of this residue by Lys modifies the temperature sensitivity of the substrate-folding activity of this protein, most likely as a result of the loss of inter-ring co-operativity. The crystal structure of the mutant chaperonin GroELE461K has been determined at 3.3A and compared with other structures: the wild-type GroEL, an allosteric defective GroEL double mutant and the GroEL-GroES-(ADP)7 complex. The inter-ring region of the mutant exhibits the following characteristics: (i) no salt-bridge stabilizes the inter-ring interface; (ii) the mutated residue plays a central role in defining the relative ring rotation (of about 22 degrees) around the 7-fold axis; (iii) an increase in the inter-ring distance and solvent accessibility of the inter-ring interface; and (iv) a 2-fold reduction in the stabilization energy of the inter-ring interface, due to the modification of inter-ring interactions. These characteristics explain how the thermal sensitivity of the protein's fundamental properties permits GroEL to distinguish physiological (37 degrees C) from stress (42 degrees C) temperatures.

Crystal structure of the temperature-sensitive and allosteric-defective chaperonin GroELE461K.,Cabo-Bilbao A, Spinelli S, Sot B, Agirre J, Mechaly AE, Muga A, Guerin DM J Struct Biol. 2006 Sep;155(3):482-92. Epub 2006 Jul 8. PMID:16904907<ref>PMID:16904907</ref>

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

==See Also==
*[[Chaperonin 3D structures|Chaperonin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli K-12]]
[[Category: Large Structures]]
[[Category: Agirre J]]
[[Category: Cabo-Bilbao A]]
[[Category: Guerin DMA]]
[[Category: Mechaly AE]]
[[Category: Muga A]]
[[Category: Sot B]]
[[Category: Spinelli S]]