2iga: Difference between revisions
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[[Image:2iga.gif|left|200px]] | [[Image:2iga.gif|left|200px]] | ||
'''Structure of Homoprotocatechuate 2,3-Dioxygenase from B. fuscum in complex with reactive intermediates formed via in crystallo reaction with 4-nitrocatechol at low oxygen concentrations.''' | {{Structure | ||
|PDB= 2iga |SIZE=350|CAPTION= <scene name='initialview01'>2iga</scene>, resolution 1.95Å | |||
|SITE= | |||
|LIGAND= <scene name='pdbligand=FE2:FE+(II)+ION'>FE2</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=XXP:2-KETO,5-NITRO,6-HYDROXY-3,5-HEXADIENOIC+ACID'>XXP</scene>, <scene name='pdbligand=XX3:(1S)-1-HYDROPEROXY-1-HYDROXY-2-KETO-5-NITROCYCLOHEXA-3,5-DIENE'>XX3</scene>, <scene name='pdbligand=XX2:1-KETO,2-HYDROXY,4-NITROBENZENE,+1+ELECTRON+OXIDIZED'>XX2</scene>, <scene name='pdbligand=OXY:OXYGEN+MOLECULE'>OXY</scene> and <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/3,4-dihydroxyphenylacetate_2,3-dioxygenase 3,4-dihydroxyphenylacetate 2,3-dioxygenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.13.11.15 1.13.11.15] | |||
|GENE= hpcd ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=47914 Brevibacterium fuscum]) | |||
}} | |||
'''Structure of Homoprotocatechuate 2,3-Dioxygenase from B. fuscum in complex with reactive intermediates formed via in crystallo reaction with 4-nitrocatechol at low oxygen concentrations.''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
2IGA is a [ | 2IGA is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Brevibacterium_fuscum Brevibacterium fuscum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IGA OCA]. | ||
==Reference== | ==Reference== | ||
Crystal structures of Fe2+ dioxygenase superoxo, alkylperoxo, and bound product intermediates., Kovaleva EG, Lipscomb JD, Science. 2007 Apr 20;316(5823):453-7. PMID:[http:// | Crystal structures of Fe2+ dioxygenase superoxo, alkylperoxo, and bound product intermediates., Kovaleva EG, Lipscomb JD, Science. 2007 Apr 20;316(5823):453-7. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17446402 17446402] | ||
[[Category: 3,4-dihydroxyphenylacetate 2,3-dioxygenase]] | [[Category: 3,4-dihydroxyphenylacetate 2,3-dioxygenase]] | ||
[[Category: Brevibacterium fuscum]] | [[Category: Brevibacterium fuscum]] | ||
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[[Category: substrate-semiquinone]] | [[Category: substrate-semiquinone]] | ||
''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 17:29:09 2008'' | ||
Revision as of 15:29, 20 March 2008
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| 2iga, resolution 1.95Å | |||||||||||||
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| Ligands: | FE2, CL, CA, XXP, XX3, XX2, OXY and GOL | ||||||||||||
| Gene: | hpcd (Brevibacterium fuscum) | ||||||||||||
| Activity: | 3,4-dihydroxyphenylacetate 2,3-dioxygenase, with EC number 1.13.11.15 | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
Structure of Homoprotocatechuate 2,3-Dioxygenase from B. fuscum in complex with reactive intermediates formed via in crystallo reaction with 4-nitrocatechol at low oxygen concentrations.
Overview
We report the structures of three intermediates in the O2 activation and insertion reactions of an extradiol ring-cleaving dioxygenase. A crystal of Fe2+-containing homoprotocatechuate 2,3-dioxygenase was soaked in the slow substrate 4-nitrocatechol in a low O2 atmosphere. The x-ray crystal structure shows that three different intermediates reside in different subunits of a single homotetrameric enzyme molecule. One of these is the key substrate-alkylperoxo-Fe2+ intermediate, which has been predicted, but not structurally characterized, in an oxygenase. The intermediates define the major chemical steps of the dioxygenase mechanism and point to a general mechanistic strategy for the diverse 2-His-1-carboxylate enzyme family.
About this Structure
2IGA is a Single protein structure of sequence from Brevibacterium fuscum. Full crystallographic information is available from OCA.
Reference
Crystal structures of Fe2+ dioxygenase superoxo, alkylperoxo, and bound product intermediates., Kovaleva EG, Lipscomb JD, Science. 2007 Apr 20;316(5823):453-7. PMID:17446402
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