View source for 5iuj


==Crystal structure of the DesK-DesR complex in the phosphotransfer state with low Mg2+ (20 mM)==
<StructureSection load='5iuj' size='340' side='right' caption='[[5iuj]], [[Resolution|resolution]] 3.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5iuj]] is a 6 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5IUJ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5IUJ FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACP:PHOSPHOMETHYLPHOSPHONIC+ACID+ADENYLATE+ESTER'>ACP</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5iuk|5iuk]], [[5iul|5iul]], [[5ium|5ium]], [[5iun|5iun]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Histidine_kinase Histidine kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.13.3 2.7.13.3] </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=5iuj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5iuj OCA], [http://pdbe.org/5iuj PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5iuj RCSB], [http://www.ebi.ac.uk/pdbsum/5iuj PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5iuj ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/DESK_BACSU DESK_BACSU]] Member of the two-component regulatory system DesR/DesK, responsible for cold induction of the des gene coding for the Delta5 acyl-lipid desaturase. Acts as a sensor of the membrane fluidity. Probably activates DesR by phosphorylation.<ref>PMID:11285232</ref> <ref>PMID:11717295</ref> <ref>PMID:12207704</ref> <ref>PMID:14734164</ref> <ref>PMID:15090506</ref>  [[http://www.uniprot.org/uniprot/DESR_BACSU DESR_BACSU]] Member of the two-component regulatory system DesR/DesK, responsible for cold induction of the des gene coding for the Delta5 acyl-lipid desaturase.<ref>PMID:11285232</ref> <ref>PMID:11717295</ref> <ref>PMID:12207704</ref> <ref>PMID:14734164</ref> <ref>PMID:15090506</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Two-component systems (TCS) are protein machineries that enable cells to respond to input signals. Histidine kinases (HK) are the sensory component, transferring information toward downstream response regulators (RR). HKs transfer phosphoryl groups to their specific RRs, but also dephosphorylate them, overall ensuring proper signaling. The mechanisms by which HKs discriminate between such disparate directions, are yet unknown. We now disclose crystal structures of the HK:RR complex DesK:DesR from Bacillus subtilis, comprising snapshots of the phosphotransfer and the dephosphorylation reactions. The HK dictates the reactional outcome through conformational rearrangements that include the reactive histidine. The phosphotransfer center is asymmetric, poised for dissociative nucleophilic substitution. The structural bases of HK phosphatase/phosphotransferase control are uncovered, and the unexpected discovery of a dissociative reactional center, sheds light on the evolution of TCS phosphotransfer reversibility. Our findings should be applicable to a broad range of signaling systems and instrumental in synthetic TCS rewiring.

Regulation of signaling directionality revealed by 3D snapshots of a kinase:regulator complex in action.,Trajtenberg F, Imelio JA, Machado MR, Larrieux N, Marti MA, Obal G, Mechaly AE, Buschiazzo A Elife. 2016 Dec 12;5. pii: e21422. doi: 10.7554/eLife.21422. PMID:27938660<ref>PMID:27938660</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5iuj" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Histidine kinase]]
[[Category: Buschiazzo, A]]
[[Category: Imelio, J A]]
[[Category: Larrieux, N]]
[[Category: Trajtenberg, F]]
[[Category: Kinase]]
[[Category: Phosphotransfer]]
[[Category: Phosphotransfer complex]]
[[Category: Response regulator]]
[[Category: Transferase]]
[[Category: Two-component regulatory system]]