2a0f: Difference between revisions
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[[Image:2a0f.gif|left|200px]] | [[Image:2a0f.gif|left|200px]] | ||
'''Structure of D236A mutant E. coli Aspartate Transcarbamoylase in presence of Phosphonoacetamide at 2.90 A resolution''' | {{Structure | ||
|PDB= 2a0f |SIZE=350|CAPTION= <scene name='initialview01'>2a0f</scene>, resolution 2.9Å | |||
|SITE= | |||
|LIGAND= <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> and <scene name='pdbligand=PCT:PHOSPHONOACETAMIDE'>PCT</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Aspartate_carbamoyltransferase Aspartate carbamoyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.3.2 2.1.3.2] | |||
|GENE= pyrB ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli]), pyrI ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli]) | |||
}} | |||
'''Structure of D236A mutant E. coli Aspartate Transcarbamoylase in presence of Phosphonoacetamide at 2.90 A resolution''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
2A0F is a [ | 2A0F is a [[Protein complex]] structure of sequences 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=2A0F OCA]. | ||
==Reference== | ==Reference== | ||
Structure of the E.coli aspartate transcarbamoylase trapped in the middle of the catalytic cycle., Stieglitz KA, Dusinberre KJ, Cardia JP, Tsuruta H, Kantrowitz ER, J Mol Biol. 2005 Sep 16;352(2):478-86. PMID:[http:// | Structure of the E.coli aspartate transcarbamoylase trapped in the middle of the catalytic cycle., Stieglitz KA, Dusinberre KJ, Cardia JP, Tsuruta H, Kantrowitz ER, J Mol Biol. 2005 Sep 16;352(2):478-86. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16120448 16120448] | ||
[[Category: Aspartate carbamoyltransferase]] | [[Category: Aspartate carbamoyltransferase]] | ||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
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[[Category: ZN]] | [[Category: ZN]] | ||
[[Category: allosteric regulation]] | [[Category: allosteric regulation]] | ||
[[Category: alternate | [[Category: alternate conformation]] | ||
[[Category: catalytic cycle]] | [[Category: catalytic cycle]] | ||
[[Category: homotropic cooperativity]] | [[Category: homotropic cooperativity]] | ||
''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 15:43:56 2008'' | ||
Revision as of 16:43, 20 March 2008
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| , resolution 2.9Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | and | ||||||
| Gene: | pyrB (Escherichia coli), pyrI (Escherichia coli) | ||||||
| Activity: | Aspartate carbamoyltransferase, with EC number 2.1.3.2 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Structure of D236A mutant E. coli Aspartate Transcarbamoylase in presence of Phosphonoacetamide at 2.90 A resolution
OverviewOverview
Snapshots of the catalytic cycle of the allosteric enzyme aspartate transcarbamoylase have been obtained via X-ray crystallography. The enzyme in the high-activity high-affinity R state contains two catalytic chains in the asymmetric unit that are different. The active site in one chain is empty, while the active site in the other chain contains an analog of the first substrate to bind in the ordered mechanism of the reaction. Small angle X-ray scattering shows that once the enzyme is converted to the R state, by substrate binding, the enzyme remains in the R state until substrates are exhausted. Thus, this structure represents the active form of the enzyme trapped at two different stages in the catalytic cycle, before the substrates bind (or after the products are released), and after the first substrate binds. Opening and closing of the catalytic chain domains explains how the catalytic cycle occurs while the enzyme remains globally in the R-quaternary structure.
About this StructureAbout this Structure
2A0F is a Protein complex structure of sequences from Escherichia coli. Full crystallographic information is available from OCA.
ReferenceReference
Structure of the E.coli aspartate transcarbamoylase trapped in the middle of the catalytic cycle., Stieglitz KA, Dusinberre KJ, Cardia JP, Tsuruta H, Kantrowitz ER, J Mol Biol. 2005 Sep 16;352(2):478-86. PMID:16120448
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