3lc6

<StructureSection load='3lc6' size='340' side='right' caption='[[3lc6]], [[Resolution|resolution]] 3.10&Aring;' scene=''>

<table><tr><td colspan='2'>[[3lc6]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Eco57 Eco57]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3LC6 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3LC6 FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=AMP:ADENOSINE+MONOPHOSPHATE'>AMP</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">[[3eps|3eps]], [[3lcb|3lcb]]</td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ACEK, ECS4934, Z5602; ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83334 ECO57])</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=3lc6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3lc6 OCA], [http://pdbe.org/3lc6 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3lc6 RCSB], [http://www.ebi.ac.uk/pdbsum/3lc6 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3lc6 ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/ACEK_ECO5E ACEK_ECO5E]] Bifunctional enzyme which can phosphorylate or dephosphorylate isocitrate dehydrogenase (IDH) on a specific serine residue. This is a regulatory mechanism which enables bacteria to bypass the Krebs cycle via the glyoxylate shunt in response to the source of carbon. When bacteria are grown on glucose, IDH is fully active and unphosphorylated, but when grown on acetate or ethanol, the activity of IDH declines drastically concomitant with its phosphorylation.

<div style="background-color:#fffaf0;">

== Publication Abstract from PubMed ==

The Escherichia coli isocitrate dehydrogenase kinase/phosphatase (AceK) is a unique bifunctional enzyme that phosphorylates or dephosphorylates isocitrate dehydrogenase (ICDH) in response to environmental changes, resulting in the inactivation or, respectively, activation of ICDH. ICDH inactivation short-circuits the Krebs cycle by enabling the glyoxlate bypass. It was the discovery of AceK and ICDH that established the existence of protein phosphorylation regulation in prokaryotes. As a 65-kDa protein, AceK is significantly larger than typical eukaryotic protein kinases. Apart from the ATP-binding motif, AceK does not share sequence homology with any eukaryotic protein kinase or phosphatase. Most intriguingly, AceK possesses the two opposing activities of protein kinase and phosphatase within one protein, and specifically recognizes only intact ICDH. Additionally, AceK has strong ATPase activity. It has been shown that AceK kinase, phosphatase and ATPase activities reside at the same site, although the molecular basis of such multifunctionality and its regulation remains completely unknown. Here we report the structures of AceK and its complex with ICDH. The AceK structure reveals a eukaryotic protein-kinase-like domain containing ATP and a regulatory domain with a novel fold. As an AceK phosphatase activator and kinase inhibitor, AMP is found to bind in an allosteric site between the two AceK domains. An AMP-mediated conformational change exposes and shields ATP, acting as a switch between AceK kinase and phosphatase activities, and ICDH-binding induces further conformational change for AceK activation. The substrate recognition loop of AceK binds to the ICDH dimer, allowing higher-order substrate recognition and interaction, and inducing critical conformational change at the phosphorylation site of ICDH.

Structure of the bifunctional isocitrate dehydrogenase kinase/phosphatase.,Zheng J, Jia Z Nature. 2010 Jun 17;465(7300):961-5. Epub 2010 May 26. PMID:20505668<ref>PMID:20505668</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

</div>

<div class="pdbe-citations 3lc6" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Eco57]]

[[Category: Jia, Z]]

[[Category: Zheng, J]]

[[Category: Atp-binding]]

[[Category: Glyoxylate bypass]]

[[Category: Tricarboxylic acid cycle]]