2qzy
From Proteopedia
(New page: 200px<br /><applet load="2qzy" size="450" color="white" frame="true" align="right" spinBox="true" caption="2qzy, resolution 1.9Å" /> '''The structure of chic...) |
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| - | [[Image:2qzy.jpg|left|200px]]<br /><applet load="2qzy" size=" | + | [[Image:2qzy.jpg|left|200px]]<br /><applet load="2qzy" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="2qzy, resolution 1.9Å" /> | caption="2qzy, resolution 1.9Å" /> | ||
'''The structure of chicken mitochondrial PEPCK in complex with PEP'''<br /> | '''The structure of chicken mitochondrial PEPCK in complex with PEP'''<br /> | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2QZY is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus] with MN, PEP, EPE and 20S as [http://en.wikipedia.org/wiki/ligands ligands]. This structure superseeds the now removed PDB entry 2FAG. Active as [http://en.wikipedia.org/wiki/Phosphoenolpyruvate_carboxykinase_(GTP) Phosphoenolpyruvate carboxykinase (GTP)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.1.32 4.1.1.32] Full crystallographic information is available from [http:// | + | 2QZY is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus] with <scene name='pdbligand=MN:'>MN</scene>, <scene name='pdbligand=PEP:'>PEP</scene>, <scene name='pdbligand=EPE:'>EPE</scene> and <scene name='pdbligand=20S:'>20S</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. This structure superseeds the now removed PDB entry 2FAG. Active as [http://en.wikipedia.org/wiki/Phosphoenolpyruvate_carboxykinase_(GTP) Phosphoenolpyruvate carboxykinase (GTP)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.1.32 4.1.1.32] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2QZY OCA]. |
==Reference== | ==Reference== | ||
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[[Category: transit peptide]] | [[Category: transit peptide]] | ||
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Revision as of 11:47, 23 January 2008
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The structure of chicken mitochondrial PEPCK in complex with PEP
Overview
Phosphoenolpyruvate carboxykinase catalyzes the reversible decarboxylation, of oxaloacetic acid with the concomitant transfer of the gamma-phosphate, of GTP to form PEP and GDP as the first committed step of gluconeogenesis, and glyceroneogenesis. The three structures of the mitochondrial isoform, of PEPCK reported are complexed with Mn2+, Mn2+-PEP, or Mn2+-malonate-Mn2+, GDP and provide the first observations of the structure of the, mitochondrial isoform and insight into the mechanism of catalysis mediated, by this enzyme. The structures show the involvement of the hyper-reactive, cysteine (C307) in the coordination of the active site Mn2+. Upon, formation of the PEPCK-Mn2+-PEP or PEPCK-Mn2+-malonate-Mn2+ GDP complexes, C307 coordination is lost as the P-loop in which it resides adopts a, different conformation. The structures suggest that stabilization of the, cysteine-coordinated metal geometry holds the enzyme as a catalytically, incompetent metal complex and may represent a previously unappreciated, mechanism of regulation. A third conformation of the mobile P-loop in the, PEPCK-Mn2+-malonate-Mn2+ GDP complex demonstrates the participation of a, previously unrecognized, conserved serine residue (S305) in mediating, phosphoryl transfer. The ordering of the mobile active site lid in the, PEPCK-Mn2+-malonate-Mn2+ GDP complex yields the first observation of this, structural feature and provides additional insight into the mechanism of, phosphoryl transfer.
About this Structure
2QZY is a Single protein structure of sequence from Gallus gallus with , , and as ligands. This structure superseeds the now removed PDB entry 2FAG. Active as Phosphoenolpyruvate carboxykinase (GTP), with EC number 4.1.1.32 Full crystallographic information is available from OCA.
Reference
Structural insights into the mechanism of PEPCK catalysis., Holyoak T, Sullivan SM, Nowak T, Biochemistry. 2006 Jul 11;45(27):8254-63. PMID:16819824
Page seeded by OCA on Wed Jan 23 13:47:53 2008
Categories: Gallus gallus | Phosphoenolpyruvate carboxykinase (GTP) | Single protein | Holyoak, T. | Nowak, T. | Sullivan, S.M. | 20S | EPE | MN | PEP | Decarboxylase | Gluconeogenesis | Gtp-binding | Kinase | Lyase | Manganese | Mitochondrion | Nucleotide-binding | Pepck | Transit peptide
