2au8

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[[Image:2au8.gif|left|200px]]
[[Image:2au8.gif|left|200px]]
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{{Structure
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<!--
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|PDB= 2au8 |SIZE=350|CAPTION= <scene name='initialview01'>2au8</scene>, resolution 1.65&Aring;
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The line below this paragraph, containing "STRUCTURE_2au8", creates the "Structure Box" on the page.
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|SITE=
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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|LIGAND= <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Inorganic_diphosphatase Inorganic diphosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.6.1.1 3.6.1.1] </span>
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or leave the SCENE parameter empty for the default display.
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|GENE=
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|DOMAIN=
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{{STRUCTURE_2au8| PDB=2au8 | SCENE= }}
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|RELATEDENTRY=[[2au6|2AU6]], [[2au7|2AU7]], [[2au9|2AU9]]
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2au8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2au8 OCA], [http://www.ebi.ac.uk/pdbsum/2au8 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2au8 RCSB]</span>
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}}
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'''Catalytic intermediate structure of inorganic pyrophosphatase'''
'''Catalytic intermediate structure of inorganic pyrophosphatase'''
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[[Category: Popov, A N.]]
[[Category: Popov, A N.]]
[[Category: Samygina, V R.]]
[[Category: Samygina, V R.]]
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[[Category: hydrolase]]
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[[Category: Hydrolase]]
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[[Category: inorganic pyrophosphatase]]
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[[Category: Inorganic pyrophosphatase]]
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[[Category: intermediate]]
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[[Category: Intermediate]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 19:29:03 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 01:57:23 2008''
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Revision as of 16:29, 3 May 2008

Image:2au8.gif

Template:STRUCTURE 2au8

Catalytic intermediate structure of inorganic pyrophosphatase


Overview

Here, we describe high-resolution X-ray structures of Escherichia coli inorganic pyrophosphatase (E-PPase) complexed with the substrate, magnesium, or manganese pyrophosphate. The structures correspond to steps in the catalytic synthesis of enzyme-bound pyrophosphate (PP(i)) in the presence of fluoride as an inhibitor of hydrolysis. The catalytic reaction intermediates were trapped applying a new method that we developed for initiating hydrolytic activity in the E-PPase crystal. X-ray structures were obtained for three consecutive states of the enzyme in the course of hydrolysis. Comparative analysis of these structures showed that the Mn2+-supported hydrolysis of the phosphoanhydride bond is followed by a fast release of the leaving phosphate from the P1 site. The electrophilic phosphate P2 is trapped in the "down" conformation. Its movement into the "up" position most likely represents the rate-limiting step of Mn2+-supported hydrolysis. We further determined the crystal structure of the Arg43Gln mutant variant of E-PPase complexed with one phosphate and four Mn ions.

About this Structure

2AU8 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Reversible inhibition of Escherichia coli inorganic pyrophosphatase by fluoride: trapped catalytic intermediates in cryo-crystallographic studies., Samygina VR, Moiseev VM, Rodina EV, Vorobyeva NN, Popov AN, Kurilova SA, Nazarova TI, Avaeva SM, Bartunik HD, J Mol Biol. 2007 Mar 2;366(4):1305-17. Epub 2006 Dec 2. PMID:17196979 Page seeded by OCA on Sat May 3 19:29:03 2008

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