2iuv: Difference between revisions
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'''CRYSTAL STRUCTURE OF N-QUINOL FORM OF AROMATIC AMINE DEHYDROGENASE (AADH) FROM ALCALIGENES FAECALIS, FORM B''' | {{Structure | ||
|PDB= 2iuv |SIZE=350|CAPTION= <scene name='initialview01'>2iuv</scene>, resolution 1.55Å | |||
|SITE= | |||
|LIGAND= | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Aralkylamine_dehydrogenase Aralkylamine dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.4.99.4 1.4.99.4] | |||
|GENE= | |||
}} | |||
'''CRYSTAL STRUCTURE OF N-QUINOL FORM OF AROMATIC AMINE DEHYDROGENASE (AADH) FROM ALCALIGENES FAECALIS, FORM B''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
2IUV is a [ | 2IUV is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Alcaligenes_faecalis Alcaligenes faecalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IUV OCA]. | ||
==Reference== | ==Reference== | ||
Atomic level insight into the oxidative half-reaction of aromatic amine dehydrogenase., Roujeinikova A, Scrutton NS, Leys D, J Biol Chem. 2006 Dec 29;281(52):40264-72. Epub 2006 Sep 27. PMID:[http:// | Atomic level insight into the oxidative half-reaction of aromatic amine dehydrogenase., Roujeinikova A, Scrutton NS, Leys D, J Biol Chem. 2006 Dec 29;281(52):40264-72. Epub 2006 Sep 27. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17005560 17005560] | ||
[[Category: Alcaligenes faecalis]] | [[Category: Alcaligenes faecalis]] | ||
[[Category: Aralkylamine dehydrogenase]] | [[Category: Aralkylamine dehydrogenase]] | ||
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[[Category: oxidoreductase]] | [[Category: oxidoreductase]] | ||
''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 17:33:39 2008'' | ||
Revision as of 18:33, 20 March 2008
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| , resolution 1.55Å | |||||||
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| Activity: | Aralkylamine dehydrogenase, with EC number 1.4.99.4 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
CRYSTAL STRUCTURE OF N-QUINOL FORM OF AROMATIC AMINE DEHYDROGENASE (AADH) FROM ALCALIGENES FAECALIS, FORM B
OverviewOverview
The quinoprotein aromatic amine dehydrogenase (AADH) uses a covalently bound tryptophan tryptophylquinone (TTQ) cofactor to oxidatively deaminate primary aromatic amines. Recent crystal structures have provided insight into the reductive half-reaction. In contrast, no atomic details are available for the oxidative half-reaction. The TTQ O7 hydroxyl group is protonated during reduction, but it is unclear how this proton can be removed during the oxidative half-reaction. Furthermore, compared with the electron transfer from the N-quinol form, electron transfer from the non-physiological O-quinol form to azurin is significantly slower. Here we report crystal structures of the O-quinol, N-quinol, and N-semiquinone forms of AADH. A comparison of oxidized and substrate reduced AADH species reveals changes in the TTQ-containing subunit, extending from residues in the immediate vicinity of the N-quinol to the putative azurin docking site, suggesting a mechanism whereby TTQ redox state influences interprotein electron transfer. In contrast, chemical reduction of the TTQ center has no significant effect on protein conformation. Furthermore, structural reorganization upon substrate reduction places a water molecule near TTQ O7 where it can act as proton acceptor. The structure of the N-semiquinone, however, is essentially similar to oxidized AADH. Surprisingly, in the presence of substrate a covalent N-semiquinone substrate adduct is observed. To our knowledge this is the first detailed insight into a complex, branching mechanism of quinone oxidation where significant structural reorganization upon reduction of the quinone center directly influences formation of the electron transfer complex and nature of the electron transfer process.
About this StructureAbout this Structure
2IUV is a Single protein structure of sequence from Alcaligenes faecalis. Full crystallographic information is available from OCA.
ReferenceReference
Atomic level insight into the oxidative half-reaction of aromatic amine dehydrogenase., Roujeinikova A, Scrutton NS, Leys D, J Biol Chem. 2006 Dec 29;281(52):40264-72. Epub 2006 Sep 27. PMID:17005560
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