2olr
From Proteopedia
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[[Image:2olr.jpg|left|200px]] | [[Image:2olr.jpg|left|200px]] | ||
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'''Crystal structure of Escherichia coli phosphoenolpyruvate carboxykinase complexed with carbon dioxide, Mg2+, ATP''' | '''Crystal structure of Escherichia coli phosphoenolpyruvate carboxykinase complexed with carbon dioxide, Mg2+, ATP''' | ||
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How does an enzyme recognize CO2?, Cotelesage JJ, Puttick J, Goldie H, Rajabi B, Novakovski B, Delbaere LT, Int J Biochem Cell Biol. 2007;39(6):1204-10. Epub 2007 Mar 30. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17475535 17475535] | How does an enzyme recognize CO2?, Cotelesage JJ, Puttick J, Goldie H, Rajabi B, Novakovski B, Delbaere LT, Int J Biochem Cell Biol. 2007;39(6):1204-10. Epub 2007 Mar 30. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17475535 17475535] | ||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
| - | [[Category: Phosphoenolpyruvate carboxykinase (ATP)]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Cotelesage, J J.]] | [[Category: Cotelesage, J J.]] | ||
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[[Category: Puttick, J.]] | [[Category: Puttick, J.]] | ||
[[Category: Rajabi, B.]] | [[Category: Rajabi, B.]] | ||
| - | [[Category: | + | [[Category: Carbon dioxide]] |
| - | [[Category: | + | [[Category: Carboxykinase]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 11:10:38 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 08:10, 4 May 2008
Crystal structure of Escherichia coli phosphoenolpyruvate carboxykinase complexed with carbon dioxide, Mg2+, ATP
Overview
Phosphoenolpyruvate carboxykinase (PCK) reversibly catalyzes the carboxylation of phosphoenolpyruvate to oxaloacetate. Carbon dioxide, and not bicarbonate ion, is the substrate utilized. Assays of the carboxylation reaction show that initial velocities are 7.6-fold higher when CO(2) is used instead of HCO(3)(-). Two Escherichia coli PCK-CO(2) crystal structures are presented here. The location of CO(2) is the same for both structures; however the orientation of CO(2) is significantly different, likely from the presence of a manganese ion in one of the structures. PCK and the other three known protein-CO(2) crystal structure complexes have been compared; all have CO(2) hydrogen bonding with a basic amino acid side chain (Arg65 or Lys213 in PCK), likely to polarize CO(2) to make the central carbon atom more electrophilic and thus more reactive. Kinetic studies found that the PCK mutant Arg65Gln increased the K(M) for substrates PEP and oxaloacetate but not for CO(2). The unchanged K(M) for CO(2) can be explained since the Arg65Gln mutant likely maintains a hydrogen bond to one of the oxygen atoms of carbon dioxide.
About this Structure
2OLR is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
How does an enzyme recognize CO2?, Cotelesage JJ, Puttick J, Goldie H, Rajabi B, Novakovski B, Delbaere LT, Int J Biochem Cell Biol. 2007;39(6):1204-10. Epub 2007 Mar 30. PMID:17475535 Page seeded by OCA on Sun May 4 11:10:38 2008
