1duv: Difference between revisions
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[[Image:1duv.jpg|left|200px]] | [[Image:1duv.jpg|left|200px]] | ||
'''CRYSTAL STRUCTURE OF E. COLI ORNITHINE TRANSCARBAMOYLASE COMPLEXED WITH NDELTA-L-ORNITHINE-DIAMINOPHOSPHINYL-N-SULPHONIC ACID (PSORN)''' | {{Structure | ||
|PDB= 1duv |SIZE=350|CAPTION= <scene name='initialview01'>1duv</scene>, resolution 1.7Å | |||
|SITE= | |||
|LIGAND= <scene name='pdbligand=PSQ:NDELTA-(N'-SULPHODIAMINOPHOSPHINYL)-L-ORNITHINE'>PSQ</scene> and <scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Ornithine_carbamoyltransferase Ornithine carbamoyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.3.3 2.1.3.3] | |||
|GENE= | |||
}} | |||
'''CRYSTAL STRUCTURE OF E. COLI ORNITHINE TRANSCARBAMOYLASE COMPLEXED WITH NDELTA-L-ORNITHINE-DIAMINOPHOSPHINYL-N-SULPHONIC ACID (PSORN)''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
1DUV is a [ | 1DUV is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DUV OCA]. | ||
==Reference== | ==Reference== | ||
Mechanism of inactivation of ornithine transcarbamoylase by Ndelta -(N'-Sulfodiaminophosphinyl)-L-ornithine, a true transition state analogue? Crystal structure and implications for catalytic mechanism., Langley DB, Templeton MD, Fields BA, Mitchell RE, Collyer CA, J Biol Chem. 2000 Jun 30;275(26):20012-9. PMID:[http:// | Mechanism of inactivation of ornithine transcarbamoylase by Ndelta -(N'-Sulfodiaminophosphinyl)-L-ornithine, a true transition state analogue? Crystal structure and implications for catalytic mechanism., Langley DB, Templeton MD, Fields BA, Mitchell RE, Collyer CA, J Biol Chem. 2000 Jun 30;275(26):20012-9. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10747936 10747936] | ||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Ornithine carbamoyltransferase]] | [[Category: Ornithine carbamoyltransferase]] | ||
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[[Category: enzyme-inhibitor complex]] | [[Category: enzyme-inhibitor complex]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 10:44:43 2008'' | ||
Revision as of 08:44, 20 March 2008
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| 1duv, resolution 1.7Å | |||||||||||||
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| Ligands: | PSQ and MPD | ||||||||||||
| Activity: | Ornithine carbamoyltransferase, with EC number 2.1.3.3 | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
CRYSTAL STRUCTURE OF E. COLI ORNITHINE TRANSCARBAMOYLASE COMPLEXED WITH NDELTA-L-ORNITHINE-DIAMINOPHOSPHINYL-N-SULPHONIC ACID (PSORN)
Overview
The crystal structure is reported at 1.8 A resolution of Escherichia coli ornithine transcarbamoylase in complex with the active derivative of phaseolotoxin from Pseudomonas syringae pv. phaseolicola, N(delta)-(N'-sulfodiaminophosphinyl)-l-ornithine. Electron density reveals that the complex is not a covalent adduct as previously thought. Kinetic data confirm that N(delta)-(N'-sulfodiaminophosphinyl)-l-ornithine exhibits reversible inhibition with a half-life in the order of approximately 22 h and a dissociation constant of K(D) = 1.6 x 10(-12) m at 37 degrees C and pH 8.0. Observed hydrogen bonding about the chiral tetrahedral phosphorus of the inhibitor is consistent only with the presence of the R enantiomer. A strong interaction is also observed between Arg(57) Nepsilon and the P-N-S bridging nitrogen indicating that imino tautomers of N(delta)-(N'-sulfodiaminophosphinyl)-l-ornithine are present in the bound state. An imino tautomer of N(delta)-(N'-sulfodiaminophosphinyl)-l-ornithine is structurally analogous to the proposed reaction transition state. Hence, we propose that N(delta)-(N'-sulfodiaminophosphinyl)-l-ornithine, with its three unique N-P bonds, represents a true transition state analogue for ornithine transcarbamoylases, consistent with the tight binding kinetics observed.
About this Structure
1DUV is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Mechanism of inactivation of ornithine transcarbamoylase by Ndelta -(N'-Sulfodiaminophosphinyl)-L-ornithine, a true transition state analogue? Crystal structure and implications for catalytic mechanism., Langley DB, Templeton MD, Fields BA, Mitchell RE, Collyer CA, J Biol Chem. 2000 Jun 30;275(26):20012-9. PMID:10747936
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